Best FACTORY Cleveland Heads!! [Tech / How To]

Lets talk about the BEST FACTORY Cleveland cylinder heads and how to identify them!!!!
My favorite article about the Cleveland heads is below. The easiest way (which I accidentally left out of the video) to tell what head you have is the shape of the combustion chamber. The "Open" chamber heads have a more circular design where as the Closed chamber heads have relatively triangular or heart shaped design. The dots and numbers should also designate this as they are a casting, but I'm not certain anyone ever verified this from the factory. They do touch on it in the article below though....
www.diyford.co...
Thanks For Watching!
For Merch head over to our store on teespring!
teespring.com/s...
Check out our our website here!
www.clevorbmf.com
Follow me on social media!
TikTok:
vm.tiktok.com/...
Facebook:
/ brooks.mf
Instagram:
/ fred_stang408
Snapchat:
/ fred_stang
My Website:
www.clevorbmf.com
Disclaimer:
Due to factors beyond the control of ClevorBMF, I cannot guarantee against improper use or unauthorized modifications of this information. ClevorBMF assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ClevorBMF recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ClevorBMF, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ClevorBMF.

[@blitz4671]

4 dot heads came in both open chamber and closed chamber...I know cause I have both on my shelf.

[@BMF_Garage]

Agreed. They definitely did

[@69JANKS]

Sure do 👍🏼

[@jacksonstephens4871]

any Cleveland head will breath 10x better then any other factor small block head regardless of open or closed chamber

[@BMF_Garage]

Completely agree

[@ldnwholesale8552]

What a load of crap! Look at ALL aftermarket heads, far smaller. The smallest factory intake port is still larger than a Chev race port in cross section. And a Chev makes far more power. And stays together as it has very good oiling and cooling.

[@RalphSampson...]

@@ldnwholesale8552 Easy, Chevy man. Jackson was referring to other Ford engines. Nobody is talking about Chevys here. I know. Ford never officially used the terms small block and big block as Chevy did. He should not have used the term small block but, still, he was referring to other "small block" Ford heads.....289, 302, 351(W, C, M).

[@davidmartin2231]

ralph sampson just like a Chevy head to butt in Ford conversation😂 But yes, Cleveland style heads are way better than the Windsor style heads. That’s why the clevor works. The 1970 boss 302 had this engine. People have stepped up a notch and done the clevor swap with a 351w

[@BamaShinesDistillery]

@@ldnwholesale8552 Thats a fan boy for you......Ford usually makes more power per cubic inch than Chevy.....

[@nickbellinger1047]

i did my apprenticeship at ford through the 70's and the thinking at the time was you could put more fuel/air mix into the open chambers therefore having a bigger bang and creating more power that way as opposed to higher compression ratio of the closed chamber ....they sound different too the closed chambers are not as throaty.....great engine i still have a couple and a few sets of heads

[@jaco5187]

Thank you! This is awesome. I have a 68 with a 289, and want to put a 351C in. I'll probably stay with cast iron. I always heard aluminum warps when they get hot, and they don't necessarily give you more power.

[@rondyechannel1399]

None other than Jack Roush wrote an article for Hot Rod magazine in 1976 about a build for the street. He used 351C Open Chamber heads with TRW flat tops with either a solid or hydraulic cam. The article is named PROfecting the 351C for the street. The bad press for these heads along with misinformation about "pinging" or detonation is being floated by the aftermarket parts industry. This is a very good open chamber design. Ever hear the same kind of misinformation about the BBC open chamber? Same, Same! With any street build just pay close attention to the intake closing point for your chosen camshaft. You can taylor your dynamic compression even if your static is quite high.

[@david20051973]

The closed chamber design is a very good chamber design, even by today's standards. In your description of Jack Roush's engine build, I think that you have your open and closed chamber descriptions mixed up. Jack would have definitely gone with the closed chamber heads.

[@SouthernCrossMotors]

That is incorrect. Closed chamber heads can have the dot. Every set of 4V heads that were fitted to GT Falcons here in Australia were 4 dot closed chamber and closed chamber without the dot, 11:1 compression.

[@BMF_Garage]

Cleveland Cylinder Head Identification, THE TRUTH (I Messed Up) kzbin.info/www/bejne/fX3Xgn9rZ6mFpdE

[@lorenzomaximo1818]

The two barrel close chamber heads are from Australia they were never offered here in the United States but they are available. The 2 Barrel closed chamber heads work really well on the street as they provide more lower end torque. You just need a matching intake manifold to match the ports which are available through Edelbrock and other sources.

[@david20051973]

The two barrel close chamber heads from Australia are perfectly matched to any Ford 2 barrel intake manifold. In fact, it is possible and absolutely satisfactory to run a 4 barrel large port intake with any 2 barrel small port head and vice versa, -irrespective of the heads being closed or open chamber design. The only issue will be that the intake runner ports will be miss aligned, due to the size differences between the respective large and small port sizes. Aside from the difference in port size, all other aspects of the heads and intake manifolds are exactly the same and as such they are totally interchangeable among themselves. Dyno tests have shown that even with the miss matched ports caused by running the larger port 4V intake manifold with the smaller port head, there was an increase of around 35hp.

[@BMF_Garage]

Wow. That’s amazing. Thanks for the info sir!

[@rono3045]

American 2v open chamber heads flow better than the Aussie ones

[@rono3045]

All the negative rhetoric on those 2V open chamber heads is incorrect.the real truth is is to put a good camshaft in that motor and you'll be surprised what it'll do better than the 4v in the quarter. Put in a comp Cam's 270H..

[@BMF_Garage]

Good suggestion

[@philipdenner8504]

here in Australia i have a set of 4V dot heads that are closed chamber

[@thatguyoverthere9634]

Supposedly, the dot primarily signifies minor change in the head design as it relates to manufacturing. At least on US cars, M-code 351c heads made in 1971 have dots despite being 4v closed chamber unlike Cobra-Jet heads of the same year which were open chamber. That said there are small dot and big dot heads which can be an indication of it being CC or OC. 1971 is the year in the US for everything to get a dot, not sure in Australia.

[@davebodi]

Thanks, I never knew that.

[@davebodi]

Mine has 4. and a dot and they are open chamber. :(

[@PRzxx]

I was always told the dot is generally a engineering revision. I have several sets of closed chamber heads that have no dot and dot, generally mid years heads as a whole. Correct me if I am wrong. Your rpm range will depend heavy on your bore aswell. 2bbl are good for 360 below, 4 bbl better for 400+. Give the heads a proper board, apoxy the floor they will flow similar to the CHI heads as a whole. Work the exhaust short side and blend the curtain aswell. Hi port plates you need 3-6 inches for them to function properly over a stock port. 3-4 is minimum not very many front ends have the space. I’m building a 446 dart block clevor. I would keep your RPMs to around 7-8k. If you go any further you will see a price difference in upkeep. Roller rockers are a nice thing. Boss 351 heads are the best heads and already have rockers milled n etc, Jason Murphy made 700+ horse with a stock head at 7200 rpm area on hot fuel. Check out tim Meyers at track boss products. He is one of few that make any and all aftermarket parts and his quality is top notch. Awesome guy, ton of knowledge and can help anyone with what they are looking for.

[@BMF_Garage]

Thanks for the info! (My favorite article about the Cleveland heads is below). The easiest way (which I accidentally left out of the video) to tell what head you have is the shape of the combustion chamber. The "Open" chamber heads have a more circular design where as the Closed chamber heads have relatively triangular or heart shaped design. The dots and numbers should also designate this as they are a casting, but I'm not certain anyone ever verified this from the factory. They do touch on it in the article below though.... I checked out Tim's website, thanks for the info! www.diyford.com/351-cleveland-cylinder-heads-guide-factory-iron-heads/

[@d-one-and-only]

open chamber heads are very suitable when stroking the engine .... so what you are explaining here is that the best most optimal performance on stock bottom end would be the 4v closed...

[@pophamlarry]

I had a set of 1970 4 barrel quench chambered heads 4. They were " closed chambers " high compression. Best heads I ever had. They had a DO NUMBER WHICH INDICATED 1970 MODEL. C9 WOULD BE 1969 D1 71 D2 72. ETC ETC.... GREAT RUNNING ENGINES

[@22099dscott]

The "Best FACTORY Cleveland head" is simply the 71 BOSS 351 factory head. You will also find that is also the champ factory 351C engine as well.

[@johnguilbert1349]

I used to have a Boss 351C motor and totally agree with you. Best factory Cleveland head hands down. It was a kick ass motor. 4 bolt mains, closed (quench) chamber 4v heads, 2.19 1.71 valves, screw in studs and guide plates, huge solid lift cam. The intake runners in the head are massive. Basically a big block head, on a medium sized block, with small block cubes.

[@thisisyourcaptainspeaking2259]

Open chamber heads offer the benefit of unshrouded valves? Dynamic compression is also a function of cam lift and timing?

[@aussi3212]

awsome unique engine combo, love the box R on cleveland heads.

[@BMF_Garage]

Thanks!

[@69JANKS]

i have 4V dot heads in the shed, they're Closed Chambers. Came off my old na 10sec combo (20yrs ago) & straight up 351ci Virtually stock ports only de-Dagged.

[@christianpeterson671]

Wrong, take seeing is believing. The dot means open chamber. Period... Check again and post a pic.

[@sykoticvl]

Yes I have 4 dot closed chamber heads too!

[@steventronnes7300]

@@christianpeterson671 nah, D1AE 66cc Closed Chamber heads produced mid 70 to early 71 have the 4 and the dot. I have a set.

[@thatguyoverthere9634]

​@@christianpeterson671 dot= a change to the head relating to manufacturing. Starting in 1971, M-code clevelands (the only close chamber, non-boss option in the US) had dots on them

[@kencohagen4967]

Cleveland heads were awesome. They rivaled BBC heads as far as flow is concerned. The four barrel closed heads are the best for all out performance when ported and had the floor of the intake and exhaust heads raised. For the best street performance, the closed chambered 2v heads were the best, but they were only used in Austrailia. But if you want the best flowing head that still provides enough velocity for low RPM torque from 360 to 400 to 400+ cubic inches, the AMC flowed every bit as good I've not better than the aftermarket Small Block Chevy heads until possibly the late 90's and newer. In fact, Hot arid magazine built an LS motor of 400 cubes or more and put an edelbrock supercharger kit on it which utilized a water cooled intercooler. In the same issue they built an AMC401 with an only school, inefficient roots type blower on it with no, none at all, II mean nada, intercooler on it, and the AMC blew away the new tech LS. So, if you really want to have some fun, look towards the red headed stepchild of the muscle car era, and be prepared to hold on for dear life!

[@BMF_Garage]

That’s awesome! Thanks for the info!

[@davidmartin2231]

4bbl quenched chambers. But in reality the even better head is one that has 2bbl intake ports with 4bbl chambers.

[@cougarmarkable]

Thanks for the 2. And 2 information !!

[@BMF_Garage]

Make sure to watch this too... kzbin.info/www/bejne/fX3Xgn9rZ6mFpdE

[@david20051973]

The dot beside the 4 or 2 that is cast into the upper corners of the US Cleveland heads, located beside the rocker cover gasket rail, is not an absolutely accurate means of identifying whether the heads had closed or open combustion chambers. Short of sighting the combustion chambers themselves, there is no means of accurately identifying the combustion chamber type once the heads have been installed onto the engine. Even the part numbers are located on the underside of the intake runners which are unreadable once an engine is assembled. The best guide is the date codes of the heads themselves as the combustion chamber designs was a running change made necessary by the changes in smog laws. Anything after April or possibly May 1971 were all open chamber designs. The exact date is unknown. A compression test can also be used to identify the dynamic pressure but these also vary greatly with old worn engines and engines with non original cams. It is no easy task after the engine has been assembled!

[@BMF_Garage]

Thank you sir. I’ve since found that out after making this video a while back. I was told my heads were the 4v closed chamber heads. They have a dot which by research would indicate open chamber, however after inspecting upon removal it VERY obvious that they are indeed the 4v closes chamber heads... 🤷🏼‍♂️ Thanks for watching and providing input, much appreciated!

[@timruiter5460]

Again, don't believe everything you see or hear on the internet.

[@BMF_Garage]

Lol and why do you say that?

[@BMF_Garage]

Agreed

[@iqinsanity]

You can bolt small block ford heads on a LS with a small modification. There’s a company that sells Cleveland heads for LS engines, I never cared to write down who because I don’t do GM.

[@daleostrom3613]

@@iqinsanity; The LS head is so similar to SBF that the hemi head that Aries built for the LS is also available from Shelby for your SBF.

[@iqinsanity]

Gm copied the sbf to make the LS It even uses the Cleveland deck height

[@fknows1]

if you can get your hands on a set off Australian 2V closed chamber Cleveland heads, they will flow better and give more power than 4V closed chamber heads

[@jamesmedina2062]

what cam? What RPM range? Porting needed?

[@craphittingthefan9445]

You forgot to mention how hard the 2V closed heads are to come by they where only made in Australia, I have had a few sets and they work well on circle track, I customize them to work on a 351 Windsor chevy's just cant keep up in the strait away, I only took them up to 6200rpm

[@BMF_Garage]

Nice! Thanks for the tip!

[@jamesmedina2062]

what cam?

[@1972mercurycougar]

Just remember guys, even Cleveland iron 2V, heads breathe, great!!

[@BMF_Garage]

Exactly

[@billwilliamson9842]

another guy that learned what he knows about 4v clevelands from bs online forums and articles written by chevy guys. Closed chamber is no better then a open chamber 4v head. All the detonation prone open chamber stories are just that , stories. Likely culprits were other things (miles of vac line/ancient smog related crap etc) but the design of the chamber is not the problem. Closed chambers are only easier to slap on any of the dish piston motors to get higher compression, thats the only advantage. if you are gonna re-build the engine, then that doesn't matter as you can run a flat top or small dome with the open chambers and have the compression right where you need it. Also the d3ze 73/74 4v with 2v sized valve heads were the only ones truly for a 4" bore and flowed BETTER then the larger valve closed chamber head at lower lift because the valve wasn't shrouded like on the larger 2.25 or 2.19 intake valve heads. I mean if you have a 71/72 2v or 73/742v 4v engine with the dished pistons and just want to do a cheapie slap together cam/head swap build and I have done that, by all means get the doae or d1ae closed chamber heads for a easy compression increase, but if you are gonna rebuild the whole thing, there isn't a thing wrong with the d1ze or d3ze heads, just run flat tops or likely a small dome piston to get compression where you want it. In fact for a street use the d3ze's would be slightly better. You can run up to a 2.12 intake valve and still remain unshrouded. I buy up all the d3ze heads I can because so many people are like this guy under the assumption the only good cleveland head is the closed chamber versions. For a street clevor, not a darn thing wrong with any of the cleveland heads, 2v or 4v, so use what you can find, have or buy at a decent price. last couple sets of d3ze heads I bought I paid $150 a set for them and I can still find closed chamber heads for $300 a set, they aren't worth much more then that in all reality. By the time you go through them, you'll likely have close to what a set of alum's go for. so the guys out there who think their crusty 4v closed chamber heads are worth 600-800 a set, go smoke some more crack. The cleveland was only around 4 years and Ford was learnin as they went with them, valve size's always decreased as they looked to gain lower end power in the 4v head.

[@mylanmiller9656]

The reason that Ford decreased the valve size in there engines was because they were aimed at economy not making power! If you are after the most power you can make you need big ports and big valves! My buddy has a set of ford motorsport D3 heads hogged out to the limit with closed chambers 54 cc and all the valve he can fit. He is making 950 hp on pump Gas!

[@rossgirdeen3247]

There's so many myths with theses engines its hard to know were to start. What is low rpm vs high rpm

[@VigilanceTech]

what about the Aussie heads with the large valves and the small runners?

[@BMF_Garage]

Those aren’t that easy to get in the US, but great heads from what I hear!

[@kingsautonspeed]

I would like to know more about making a cleaver 302?

[@BMF_Garage]

1969 boss 302 had those. Same as a 351w based Clevor just different intake manifold

[@kingsautonspeed]

I know the water passages have to be modified, but a high rev 302 🥰

[@BMF_Garage]

@@kingsautonspeed The only good way to make a high revving 302 is with a non stock block in m opinion. RPM and torque are killers for those stock 302 blocks.

[@cammontreuil7509]

Find a 1987 roller Block. 1970 boss 302 heads and intake. Use cleveland flat top pistons in the block on the stock rods. A 69 truck crank with rear oil slingger trimmed off to fit a one piece rear seal. Use the stock roller cam with 350 Chevy hardened push rods. Main studs rod bolts head studs. Do what ever to strengthen the engine. I built one that turned 7,500 easy with dual valve springs. Don't knock it till you've did it. That low lift cam screams.

[@jimmywaters3987]

Old Bogan, received your reply. Thanks ! I've never bought anything from overseas. I'm guessing that PayPal or certified bank money order would be the way to go for payment. What would the price be on a set ( bare or complete, hopefully fresh from a bath in the caustic soda vat to remove the grease) + shipping ? . While I'm at it, what about a inline 250 cu. in. 6 cylinder aluminum crossflow cylinder head ( it's the one with combustion chambers that resemble the Cleveland cyl. heads)? Do you have access to any of those ? price + shipping ? I suppose it's safe to say that shipping time would be approximately 1 month, being that I live in Texas. Here's looking forward to your reply and maybe some cylinder heads. You guys down in Australia have got it going on with the Cleveland stuff. What about the Arrow blocks? Thanks again !

[@tonymontana897]

You need a mic dude ! We can't hear you properly.

[@BMF_Garage]

Lol I’m aware. Old ass video. Didn’t know what I was doing 🤷🏼‍♂️

[@dylanrice6707]

I know this is a old video but would 4 barrel open chamber heads be good for a turbo build

[@BMF_Garage]

I’ve never personally used them. I think with boost they’d perform ok. There will always be a better head regardless which one you go with... it’ll depend on how much boost and what rpm your associated gear works best with. Go with higher rpm and keep it up there through the pull and it could be awesome

[@69JANKS]

Open can help you out with some low static comp yes, still perform ok. But can still use closed chambers on Trbo/blower depending on your Rod length & Piston combo to help you gain reasonable lower static comp. Old clevo heads are a little thin on the deck surface (not enough meat) compared to good aftermarket alloys out there.

[@rondyechannel1399]

@@69JANKS The open chamber 4V head gets a lot of bad publicity from the print and internet media. Mostly this is due to aftermarket cylinder head companies trying to justify the purchase of new aluminum heads. Open Chambers work great according to Jack Roush in an article he wrote called "PROfecting the 351c for the street in 1976. He advises using the flat top trw forged piston and 4V open chamber head with or without a solid or hydraulic cam!

[@jondahl3173]

Ford's own testing shows the open chamber head performs well above 3000 rpm. Quench pads are the hot ticket idle to 3k rpm, flame front travel in that rpm range needs the help closed chambers provide. For a race only motor the open heads are great. If you can get the static compression you want using a flat top piston your total cylinder area is actually better than a deep pocket in the top of a piston. Think about it.

[@kurtkamin7804]

No advise is better than bad advice That casting dot doesn't mean anything

[@davidboldon8764]

Dot is NOT an indicator of closed or open. I have a pair of 4 dot heads that are CLOSED chamber.

[@BMF_Garage]

You are correct... I cover that in my follow up video kzbin.info/www/bejne/fX3Xgn9rZ6mFpdE

[@cammontreuil7509]

I have a set of boss 351 heads. They have a dot. Also my 72 cj heads have dot.

[@joshreese1721]

Any one have any flow numbers how do they compare to GT40 and GT40p heads?

[@BMF_Garage]

There have been some flow tests done. I can't remember the numbers, but they flow a lot more than the gt40 heads if i remember right. Somewhere around 280-300 for the cleveland heads.

[@mylanmiller9656]

One intake on a Cleveland will flow better than two GT40 intake ports! There is no comparison in these two heads!

[@mylanmiller9656]

I have some numbers off my stock 4v closed chambers they are bone stock with 3 angle valve job! We flowed 6 sets and these heads are about average all were within about 6 cfm of each other! intake is 137 @ 200, 184 @ 300, 237 @ 400, 277 @ 500, 294 @ 600! exhaust is 86 @ 200, 136 @ 300, 158 @ 400, 175 @ 500, 181 @ 600

[@dancooper6705]

Got 71 open chamber heads on LTD got 70 cobra jet 4 bbl heads this week. thanks for information comp cams roller engine coming soon

[@BMF_Garage]

Sweet. Post some links when you get it going!

[@jimmywaters3987]

Nice video ! The open chamber heads will tend to "ping" . Optimizing your timing and running good gas will help immensely. The 2 bbl. closed chamber, ala "Australian" cyl. heads are the best bet for a regularly driven street car. Power Heads in California will CNC port those heads and they will flow enough for a fairly quick street car. They do awesome work. A 2.08 intake/ 1.60 exhaust will cover 90% to 98% of most any bodies street car combination, unless you have a "outer fringe" piece that requires a set of killer heads. A place in Indiana, the name escapes me at the moment, will machine your Cleveland heads for hi-port plates, if you are running a really serious piece. They also sell the plates, head bolt / stud sets, intake adapters, etc. for Cleveland headed engines. Hope this helps. I will get back to y'all with the the name, phone number, web site of the place in Indiana.

[@BMF_Garage]

Thanks for the help!

[@BMF_Garage]

Good to know, thanks! Any idea what shipping to the states for something like that runs?

[@jimmywaters3987]

+Clevor BMF re: shipping charges Don't know right off hand. I have never bought / shipped anything out to you folks. But I hope to remedy that very soon. A lot of the cost is due to weight, then distance. Then, how quick you want the parts shipped. At least that is the way it is done here in the states. I'm not familiar with Australia's postal system, although I'm fairly sure the procedure is possibly the same. Looking forward to buying some of those awesome parts you guys are making down there, thanks for keeping the Cleveland hard core parts coming !

[@billwilliamson9842]

if your open chamber headed engine pings, its not the chamber shape causin it. You got other issues, stop blamin it on the heads. smh so whats the excuse when a closed chamber head pings?

[@billwilliamson9842]

@old bogan LOL I think your'e right. seriously man i get so tired of readin the same mis information on here that is regurgitated on the forums and facebook groups by morons who want to sound like they know what the heck they are talkin about but in reality don't have a clue. I remember before the forums and places like this, when people simply applied actual knowledge based on experience not rumor. I miss those days.

[@noahhoff4926]

Australian 3v heads are the best u get best of both heads 4v valves and 2v ports

[@BMF_Garage]

+Noah Hoff Nice. I've never heard of them... I'll have to look into those. Thanks !

[@noahhoff4926]

Clevor BMF their called aussie heads their good

[@davidincognito7285]

Ive heard of those. The aussies produced 351c's longer than they did in the us. I want a set

[@BMF_Garage]

+David Poston makes two of us....

[@noahhoff4926]

What piston did u get for ur clevor

[@rattlehead7665]

untrue about the dot indicating closed chambers.

[@BMF_Garage]

Yep, that’s why I made this video Cleveland Cylinder Head Identification, THE TRUTH (I Messed Up) kzbin.info/www/bejne/fX3Xgn9rZ6mFpdE

[@timmiller4667]

I have 2 sets of 4 dot heads and they are both closed. This video is another false 4 dot rumor.

[@BMF_Garage]

Agreed. This video came from me researching my heads and trying to figure out what I had. I obviously found out there is a lot of wrong info out there on these heads....

[@dancooper6705]

yes , had this 351 Cleveland 15 years now , everyday driver. got heads from a friend who raced dirt track back in the 80S Heads are like new Comp cams makes a roller set and I got a Holley 850 cfm alcohol carb....yes running it on alcohol. trying to rebuild this month , I'll keep a video log. I need headers or exhaust manifolds for this ...the exhaust ports are much larger that 351c 2v open chamber heads to 351,c 4v closed chamber heads the exhaust manifolds don't appear to line up at all.... big oval ports from small square ports. if you locate or know where exhaust manifolds are , please contact headers are not going to line up with my new exhaust system , even if I can find headers for an LTD...maybe Mustang will work. I got a Mustang with a 302 in my Garage , 88 GT the 83 with a custom engine build and 5 speed was ungodly fast

[@panelvanman7671]

the 4 , 4dot and so on is not correct , i have 2v closed chamber heads in my shed , 5 sets of them , some have a 4 some have a 3 and some have a 2 in the corner , its a myth

[@BMF_Garage]

What method do you use to tell them apart?

[@panelvanman7671]

take them off , the cast marks really do have no meaning , maybe to ford but not the heads , mine are all 2 closed and the one that threw me was the 3 mark , i pulled it off a motor just because i hadnt seen it before and yep 2v closed , i dont wory about it now , if im buying an engine i just wait till i get it home and take it off , i have 4 motors i bought in the last month that i need to look at the heads , 3 302's and a 351

[@gergatronic]

The best way to identify 302 heads is by the number of scallops cast at the front of the heads just above the face. 3 scallops means 2V closed. 2 scallops mean open chamber. A very detailed account: www.aus-ford-uk.co.uk/html/engines2.html Finding a set of these in the US would be very rare indeed. They were Australian only, produced solely for the 302C. Any sets you find over there would have been imported by one of a few companies that deal with them. They might be the better street iron head on paper but I've found that the quality of the port castings and throat machining is poor. US 2Vs flow around 200cfm whereas an Aussie 2v is around 180-190. This needs fixing with some basic port work and blending.

[@ldnwholesale8552]

Some 302 2V heads have a 4 on them to confuse things. The 76 on engines had a 4bbl intake and a Thermoquad carby. But NOT the items used on 4V engines

[@markrosetta3948]

4 and dot means 4 barrel closed chamber he made a mistake

[@darronmecak5720]

thats right 4 dot is closed chamber

[@leestewart3690]

Ford is funny as I have the 4 dot and the heads are open chamber 1973 351 cj

[@david20051973]

@@darronmecak5720 Not always! The presence of the dot is not an accurate way of predicting if the heads were open or closed chamber. I have had an engine, one head had a 4 dot and the other head had just the 4, yet they were both closed chamber. Go figure!

[@rono3045]

Here's the real truth on Cleveland heads. The best ones you can get were made in 1970 in America and they are the open chamber TV castings simply send those to machine shop have them shave them ten thousands off.then pull your 4v closed chamber heads off of your boss 351 put the 2V on, and watch quarter mile time drop true story.1970 casting TV heads will make power clear up to 6500 RPM and we'll outrun any 4V heads even some aluminum ones guaranteed

[@Sokrates66]

Completly false, the dot isnt open chambers, it can be both. This video is totally broscience.

[@BMF_Garage]

I agree.. the best way to tell is looking at the chamber design/shape. There are inconsistencies with the markings vs the chamber shapes. The controversy over what the dot markings stand for will forever cause controversy, and my video didn’t help. Obviously my research led me down the same path as many others with mis-information 🤷🏼‍♂️

[@Sokrates66]

@@BMF_Garage The dot appeared late -70 and is due to a revised mold but nothing to do with the open vs closed chambers. The confusion is because that there is produced more open chamber heads than closed chamber heads. Closed chambers between 1970-71 and open chambers between 1971 to 1974. So the percentage is more likely to be a open chambers with a dot. No dot, early date code or the casting code under the intake runner is the true tell of it is a closed chamber.

[@BMF_Garage]

Thanks for the info 👍🏼 that’s good to know!

[@ldnwholesale8552]

Dont waste your time with 4Vs. Ports are way too big and have poor velocity. 2V closed chamber which are Aussie 302C heads are far better. May not make absolutely top end power but the engine will be driveable and ultimatly far faster. Remember we are talking a Clevo, a poorly oiled and cooled engine so about 7000 rpm is the end of the world or it explodes, and without very carefull prep that is 6000. The 2Vs got worse from 72 @ 58cc through to 83 @ 64cc as the chambers got larger, and 76 on ones are generally stuffed as the 27A pollution regs made the valved burrow up the ports and also kill the guides. And inserting them they usually crack . Those 4Vs are improved with 'tongues' that down size the intake to 2V. But the exhausts are way too big and short. The best head full stop is the 3V from CHI in Melbourne Australia. Far smaller ports that make a LOT more power. They make a few versions to suit most applications.