Installed 305 heads on the old 283

Well its getting closer to go time! My "shop" is a bit tidier since I have less parts on shelves and more connected to the engine block. I used a small amount of oil (less than a drop) under the head bolts from a fishing reel syringe applicator. The head-bolts came with thread sealer but I added just the tiniest amount to give a slight lubrication and sealing as they were torqued into the block. Hopefully I can get this thing on the stand and running when the weather gets cool.

[@ScroatBagGarage]

That chrome oil pan when matched with chrome valve covers are good for +10 horsepower :)

[@Spiritof_76]

Who gives a crap? Maybe a set of valve covers made of cast aluminum with Edelbrock name on them will be faster. Or painted steel with Chevrolet script. Petty SOBs come on here to rag on a guy rebuilding an engine that is obviously not a race or high hp combo want to make a bunch of negative remarks. Maybe the pan was cheap and it holds oil. Some other dingus complained it will leak. Paint some Indian Head sealant on the flange before the gasket and it probably won't. Go do something.

[@lildeena1]

@@Spiritof_76 lol thanks. I never built an engine im just learning and reading. I appreciate you watching.

[@MarkCartret]

True....but you get way more horsepower out of that 350. The chrome is good and looks nice. There are aftermarket 283 chrome valve covers which will add to that. You could have siliconed the old cover and it has enough bolts engineered to flex it on correctly while the silicone squeezes out. Once that happens “presto” -it won’t leak. But I love the 283. It’s a heck of an engine. Had two myself. Slip a small cam in while she’s at that stage. Add long headers and a cold air filter. An aluminum (lightweight) intake will not hurt. Top it off with a high performance electronic ignition. You won’t be sorry.

[@davidcarder6364]

Now it's on the bube tube,I did this year's ago,a 67 Chevy truck with a 283 blown a head gasket 305 heads have the same combustion chamber volume

[@ChrisMcCutcheon-wj2pp]

58 cc, I belive the 305 ho heads flow better, the old power pack heads got really good fuel mileage on these cubic inches also

[@johnnikollaj496]

If the heads are the 416 or the 601 casting those are actually pretty good heads.

[@MasterWitchDoctor]

no theyre junk the 081 305 head is the only 305 head to use. They flow 185 cfm @ .400 lift which is better than every double hump head except the 291 casting at .400 lift. Verses a 416 casting they blow them away. On my K/SA SS Monte Carlo Im getting 193 cfm @ .403 lift with nothing more than a multi angle valve job and 1.845 inch intake valves. The 416 head flows around 165 cfm because the intake ports are crap, Chevrolet used the 882 casting as the roll model they designed the 416s from.

[@Spiritof_76]

@@MasterWitchDoctor The only blowing away is you blowing someone. He could have put some Dart 220 cfm heads on and got even more air volume, but should he? The 081 is the only head to use? If he gets 165 cfm on a 283 for general use, he'll be doing fine. Did the video say he was trying to win drag races?

[@shawnc757]

Great vid and engine bro! Good to see people still admiring vintage. Hope your build goes as planned. I haven't checked out the rest of your vids but will do so to see your progress as I have a 283 I would like to tinker around with. Its true some 305 heads do not flow well based off its intended use. However, I've researched most 305 heads and the better flowing of them all are the H.O. and vortec 305 heads. Cant remember casting #'s but worth the research IMO.

[@notrodtv6113]

I looks forward to finishing this motor this winter. I have been working on replacing the fuel tank and doing fiberglass repair on my boat. The best heads are supposed to be 610 small chamber and 416 "HO" heads but many say they are both junk and stick with the original heads for the classic look and the performance is probably similar. The 305s are considered lightweight and prone to cracking as well as some thin gaskets are not recommended with them. I just got these rebuilt heads from someone and they were a steal at 150.00 completely rebuilt. Rebuilding my originals heads was just gonna break the budget on my first build. I still have the original Intake and heads for going back to a classic looking motor if I should decide too. The cost of machine work is high and people will poke fun at you because everyone says ohhh you can buy a way better motor with a lot more HP than the cost of doing a rebuild on a slug like this. You can also do vortec heads with a vortec intake. Regardless of what you do keep in mind the quench. Rebuilder cast pistons are designed for decked blocks and your block may be okay for thick gaskets but when you consider how much compression you lose you will want to go to a thin gasket but they aren't as tolerant as a thick gasket. Make sure you know all your "In the hole" measurements head gasket compression thickness piston measurements and calculate that and consider decking the block even if it is in good shape. Good luck!

[@boogieman3165]

@@notrodtv6113 I'm assuming from your comment that you haven't started this engine yet although this video is a year old. I noticed you are using the new style head bolts. The new style bolts are not designed to be torqued the way you say you did in the video. You torqued the new bolts using the old standard. The old standard is torquing the bolts to a certain torque value and stopping there, this will not work for new style bolts. The new bolt torque standard is torquing the bolts to a certain torque value and then turning the bolt another half to three quarters turn. These new style bolts have a certain amount of stretch built in for this procedure and if you torque them the old way you will get uneven stretch and possible bolt failure and uneven torque values across the head which can cause all kinds of problems from blown head gaskets to cracked heads. I thought I would give you a heads up on this before you crank the engine. I built a 305 head 283 engine several years ago and it ran great. I decked the block and surfaced the heads and used the thin metal gasket with stock flat top pistons. I'm not sure of the compression ratio but it was high enough i could not run 87 octane gas. I spent about 8 hours on each head porting the intake and exhaust runners and deburring the combustion chambers. I ran a mild cam in it also. I got tons of use from that engine in a daily driver and even put it in my drag car for a while and as far as i know that engine is still running in a '59 chevy pickup truck.

[@notrodtv6113]

@@boogieman3165 So essentially you are telling me to go 1 half turn more on each bolt in the correct order? after the recommended SBC original bolts torque spec? I will look into that. Thanks for your feedback.

[@boogieman3165]

@@notrodtv6113 The head bolts you purchased appear to be the LS style head bolts which are made of different materials than the original style head bolts. The LS style bolts have a completely different way of torquing them down as opposed to the old style bolts. You'll need to contact your local GM dealer to find out what type bolts you have and get the torque procedure from them. LS Cylinder Head Torque Specs Engine Family Bolt Size First Pass Second Pass Final Pass Gen. 3 (LS1, LS6, etc.) M11 x 155.5mm 22 ft.-lbs. 90 degrees 90 degrees Gen. 4 (LS2, LS3, etc.) M11 x 155.5mm 22 ft.-lbs. 90 degrees 70 degrees

[@notrodtv6113]

@@boogieman3165 Okay I bought them at a local speed-shop they weren't GM parts but I will look into it. they are Head bolts - EW1 170,000 psi, flanged hex head, with sealer already on threads

[@Wilson-cp4gx]

If you had the most common 283 head, changing to the 305 head just lost you 25 hp! Congratulations!

[@johnkelly8525]

Yeah mate, I thought the same thing glad lm not the only one who thinks the 305 heads are shit

[@Spiritof_76]

Do you have any dyno evidence? How is the 1.72 intake 283 head flowing more than a 1.84 intake 305 head? Their highly advanced combustion chamber shape? Their port shape? The chambers have roughly the same compression ratio. Where is this magic 25 hp coming from?

[@johnkelly8525]

@@Spiritof_76 this was posted 4 years ago, feel dumb now, I do

[@Spiritof_76]

@@johnkelly8525 I do not. People continue to watch these videos and read the comments. I was well aware of the posting dates. I stand by my assertion that 305 heads don't lose 25 hp to 283 heads.

[@johnkelly8525]

@@Spiritof_76 that's fine you can believe what you want,. I believe your wrong sounds to me that the larger bore with larger valves would be better

[@patriotrob7066]

Awesome!! I have a 1965 283 220hp originally in a 79 monza spyder. It has the 081 305 heads a small comp cam .performer manifold a 770 vs brawler carb. And 3500 stall. And it rips pretty damn good and revs like a two stroke!!!

[@scummbagracing4241]

I'm going 283 in my 77 monza also What crank and cam you running. And gears.

[@Spiritof_76]

I'd love to have a Monza Spyder. There can't be very many left in the wild these days. Most have been crushed.

[@tubedude1077]

If you like old stuff you should have went with the power pacts and kept the breather at the rear of the block then you could use the vintage looking valve covers without an modern ugly PCV valve . UGH!

[@notrodtv6113]

You are right! But I just didn't want to spend the money on rebuilding my Power PaKs. I got these heads already rebuilt for $50.00. I never did any engine building before and this seemed like an option that would get my first motor going. I still have the Power PaKs and the baffle thing and some of the other parts.

[@alchampion340]

What casting head did you use? I’ve been a couple 283s in my life. I ran big 194 valve heads on them. Is a tough little engines all I have to say the more you beat on it the more it’ll take.

[@user-david6265]

My 283 .125 over 302 with a rv cam and 750cfm holly will burn one tire for 3 blocks if I put the right amount of gas hehehe they are fun

[@victorjudice7344]

You should have ported and polished the heads for a few more horsepower.

[@tubedude1077]

Don,t put 305 heads on anything .Sure they boost compression but they will crap out at 3800 rpm . They don,t flow the air well .Use the stock 283 heads or even go with 194 . 160 feulie heads .not the 202

[@Spiritof_76]

Because the 305 Monte SS and the 305 z28s were so much slower than cars with 283s, right? So what were the cc on the typical 283 heads and the 305 heads? And what are the flow numbers on 305 vs 283 heads? Why would a mild cammed 283 need 160 exhaust valves?

[@jimthomas1989]

@@Spiritof_76 , The cc on the Fuelie heads is 58cc ,as for the flow rate , I don't know , I had my intake runners ported and my exhaust openings opened up and then had a valve job with Manley Stainless Steel Valves then added Hooker Stainless Steel Headers , The intake is a Torker II with a 1050 cfm Duel bowl Dominator , It has 11.5 Forged Pistons and makes 475hp , I would more than happy to put it up against Any 305 built or not I also have a 307 which is a 327 crank in a 283 block block that I would put up against ANY 305 engine

[@Spiritof_76]

@@jimthomas1989 You've missed the point. Now you are writing about worked-over camel hump heads on a built 283, right? My garage is full of sbc parts. The conversation is about 283 vs. 305 heads. No oem 283 head was all that special compared to a -416/601 305 head, even the "powerpack" heads with the triangle on a brick. CC and flow numbers are very similar. I agree with your preference of 283 blocks rather than 305 due to a larger bore, as well as the 307 with the 327 stroke, an under-rated engine for sure. I have two 283s and zero 305s, but several pairs of 305 heads. The 283s have 1.72 valves. The 305s have 1.84.

[@brianbloom1799]

I have been wondering hows that 283 doing and how did it run, Putting 305 heads Brings up your Compression, Depending on Pistons They are a Great little Motor,

[@ChrisMcCutcheon-wj2pp]

These are great motors, the power pack heads always give great gas mileage on 307, 283, just b careful on 283s, valve lift may cause certain common valves to contact side of cylinder

[@Spiritof_76]

On a 305 more likely than a 283. Any idea how big of a cam would be needed to make a 1.94 valve hit the bore of a 283?

[@ChrisMcCutcheon-wj2pp]

@Spiritof_76 the last one I checked had 2.02 valve in it, wasn't much best I can recall, .460 maybe comes to mind

[@Spiritof_76]

@@ChrisMcCutcheon-wj2pp It would be a waste of time fitting 2.02 valves in factory 283 heads. Most of the stock ones were 1.72.

[@ChrisMcCutcheon-wj2pp]

@Spiritof_76 yep, back then we pillage thru scrap yards or anything and used

[@boduke2522]

gasket match intake ports and clean up alittle casting flash around intake and exhaust wont hurt

[@kevinfalkner1624]

The fuel rails on a 305 are narrower than any 4in bore. Head 283 thru 350 So the fuel flow rate is compromised you will get more compression, but no more horse power. I saw a guy do the ""54cc heads right", ,, on a 307 no gain.

[@johnkelly8525]

Right on dude

[@Spiritof_76]

What fuel rails?

[@Spiritof_76]

All of you claiming that the 305 heads are going to perform worse than 283 heads ever look at them side by side? I have several pairs of powerpack , 601, and 416 heads. There is no magic in the 283 heads. A lot of them are in need of expensive valve guide replacement to be used. The compression ratios are all similar. Any one who has dynoed them and compared, please chime in. Otherwise, I see a lot of opinions based on no evidence, just hearsay. Do you know about the 1.84 305s vs. 1.72 283 valves?

[@MasterWitchDoctor]

ever heard of stiction? Its what happens to the intake charge when the valve is too close to the cylinder wall. Adding a bigger valve DOES NOT equal more hp, point in case are 305 heads. A 1.84 inch intake valve makes more power than a 1.94. Doubt it go tell that to Randy at Brzezinski Racing and see what he tells you. He's done more cylinder heads in a week than you will do in your entire life. I love guys like you that think you know it all, proving you dont is real easy.

[@Spiritof_76]

@@MasterWitchDoctor No shit, Sherlock? I know about Brzezinski, here in my home state. I said nothing about bigger valves in the 305 heads. Ever hear of valve shrouding? Have you compared powerpacks, 601, and 416 heads? I have all of those in my garage, as well as a pair of 461s. A 305 has a smaller bore ( 3.736) than a 283 (3.875) and the 305 heads are not going to push the valves closer to the cylinder wall. There are examples of 283 heads with 1.72 valves making crazy horsepower with wild cams, but I bet the better 305 heads can do just as well with equal port work. Is there some data you can point me to, or are you just here giving another opinion? PS: I DON'T love guys like you who think they know it all.

[@lildeena1]

I think I have a video with both on the table.

[@mikewillett5076]

I didn't know the 081s flow better than 416s and 601s unported. But I just can't do centerbolt valve covers. So when I do another 283 or 307 I'm going with Trick Flow 175s, port them and mill em as much as reasonably possible.

[@youthmanrecords965]

Chrome oil pan allows for more seepage over time. Chrome isn’t porous and the oil just slips past it Chrome head covers , oil pans and timing chain covers. No bueno

[@560lds]

On a chrome oil pan sand or light grind chrome until gone, where gasket meets pan no leaks!

[@johnkelly8525]

Come on

[@Spiritof_76]

Sand the mating surface and apply Indian Head gasket sealant and let it get tacky before the gaskets. Problem solved.

[@chriswells1440]

Internet and manufacturer hype about oil on head threads is wrong ! Tear apart any sbc. or bbc. What's on the threads ? RTV sealant... Glue goes on threads to keep coolant from leaking past the threads.

[@benscoggins3149]

throw that chrome pan away they leak

[@notrodtv6113]

Thanks for the heads up

[@Spiritof_76]

They leak if you don't know how to install them.

[@Classickoolcars]

And keep in the heat😱

[@Spiritof_76]

@@Classickoolcars That hardly matters at all. It's internet and old wives' tales. A good radiator and fan remove the heat, and an oil cooler if you are racing.

[@PhelpsyTattoo]

Fun to read all the misinformation from the peanut gallery about everything from cc's to flow.

[@johnkelly8525]

Spot on bud

[@jeffduncan6825]

What size cam did you use and curiosity what brand I know this is an old post so hopefully you can get back to me

[@notrodtv6113]

Nothing crazy since they are stock heads, I used a cam lift. intake.296 Exhaust .311 .50 Duration intake 214 exhaust 224 Melling 22203 Wg1159

[@MasterWitchDoctor]

dont use oil on the head studs use gease, oil will leak out by the bolt via engine vibration grease wont. I use BelRay synthetic salt water proof grease. 305 head especially those are EPA compliant and lack the ability to flow. those angled bridges at the roof of the intake ports are there to deflect the airflow and slow it down. Removing those will help them as far as actually working but the exhaust ports are a complete waste of time and most of the performance 305 heads (dare I call them that) are light weight castings and are highly crack prone (416s especially). The 283 heads have a whole lot better combustion chambers than the 305s and you arent stuck using center bolt valve covers. There are a lot better choices as far as 305 heads are concerned, personally Id use World Products S/R Cylinder Heads 042650 from Summit. Theyll make an easy 30 hp over ANY factory 305 head and theyre not exactly expensive. Will they work on a 283? the list of guys using them is endless.

[@notrodtv6113]

Thanks for the advice. I still have the old Power-pak heads and original intake in storage. I just found these rebuilt heads and made a decision to use them as opposed to spending more money on a first build. We will see how it runs hopefully soon. Ive been messing with my boat motor and it's 4 carburetors.

[@johnkelly8525]

Yeah mate 305 heads are crap

[@Spiritof_76]

@@notrodtv6113 Don't listen to these keyboard warriors. They're full of hot air and think everything has to be maximum everything. Small block Chevys can run on mule piss and swamp water. As long as the compression isn't too high or the cam too big, lots of head/block combos will do fine.

[@reeferreborn3245]

Thanks, I never got back on this project but I can tell you what, I am amazed mostly about the comments and opinions that I get. My only goal was to find a junkyard block and build it to get something that runs decent without spending an arm and a leg on machining and high performance parts. I learned a lot and some things a little too late. I think if I were to do it again I would have decked to block so I could have more gasket options since I believe my cylinders are deep in the whole because of the rebuilder pistons. The heads were purchased in bags wrapped up and newly machined for 100.00 bucks they would fit and I wouldn't have to pay a machine shop for the original heads. I still the original stored as well as the intake road tube waterrpump etc. Thanks for watching!@@Spiritof_76

[@Spiritof_76]

@@reeferreborn3245 I have before and am now building a SBC engine, and love doing it with craigslist and ebay used parts as much as I do with high dollar new parts. Unless you are building a race motor, lots of things just work. Having perfectly flat heads and block are more important than those other factors. Have a great day.

[@tonyfuoco6169]

Forgive me if you answered this, but what cam and cam specs are you running in this engine?

[@notrodtv6113]

Int .296 exhibit.311 SAE DUR288 INT 298EXH .50 214 INT 224 EXH Melling 22203wg 1159

[@nelyh1395]

I also have 416 heads and was just curious if your using stock size push rods and flat tapeds

[@lildeena1]

yes I am

[@stoveguy2133]

305 heads have rib in exhaust port to restrict flow and theoretically improve velocity and improve low end torque. They suck.

[@johnkelly8525]

Yeah mate they suck why do people do this,?

[@Spiritof_76]

Do you have a set to look at? I've never seen that in a 601 or 416 head, and I have both in my garage, as well as some 283 powerpack heads.

[@davidullman3210]

why you didn't clean your ports out

[@djmadd1212]

What kind of power did you get.. I'm wanting to do a v8 swap to my blazer 96 prolly the same motor 283 with 305 heads.. I want power and torque..

[@lildeena1]

I still have my intake, Quickfuel Carb on on the shelf. maybe about a month ill get this thing running. But if you want power find a 327 or 350, You will have lots of choices for heads and recipes for success checkout show called Engine Masters with Dulcich, with 283 you are limited with heads with this motor you can get 305 heads "'416s' and or 601s 601 are a small chamber 53cc and would actually give you a nasty 283 Block. You could get World Products 305 heads for a reasonable cost and you can get some other from Dart and Edelbock but $$$. You could also rework the Power-Pak heads with the nice 58cc chambers but it will cost you the rebuild. You could also get into GM Vortek heads and Vortek Intake Also all these motors are the same except bore size and a few details along the evolution process. So after you bolt on new style heads go with modern intakes air cleaner and PCV systems it could be a 1988 350 or a 1966 283' they would look identical. I kept my heads and intake and road tube parts so if I ever want to go to the old school factory looking motor I have the originals parts. Hope this helps. Keep in mind if you are rebuilding on your own and starting with minimal tools and experience and bolting on all new parts then it would be a better result buying a crate motor with vortec heads and pumping out 300+HP for another $1000. I am into this as a personal interest and learning experience.

[@bobbymarcrum6351]

If your looking for Torque , Then don't look at a 283. It has a short stroke and a was built to rev not pull hard from a dead stop, always remember that the shorter the stroke the less bottom end (torque) .... You can build a 283 to be a screamer but it cost!. For the street/Strip you want good bottom, 383 or 400 SBC

[@johnkelly8525]

Don't do this then

[@63Imp283]

Ok winter's over! Lol How's your build coming!? I will have a similar build w/ 416 heads for $Free.°° RV cam and also my first build. Subscribed.👍

[@notrodtv6113]

I am actually thinking about getting on it. My boat is fixed and runs great.

[@bird197196]

Internal breather

[@wreckanchor]

Looks greaat. How is it doing 3 years later?

[@mikewillett5076]

I hate when there's no updates or seeing it running maybe driving later. Few enough 283/307 videos as it is.

[@notrodtv6113]

hey man sorry but I never finished it and its on hold

[@wreckanchor]

@@notrodtv6113 I rebuilt a 283 this year for my uncles car and it came out really nice. I went .040 over and used a Summit 1103 cam and a cast iron holley intake off a late 60's Corvette. I also used the stock power pack heads. The engine revs. really nice and is very fun to drive with the 4 speed thats in the car. Even painted the Chevy script on an old set of factory valve covers so everything looks stock. So happy with this little engine I was surprised by its performance.

[@dehoedisc7247]

Mechanical fuel pump, takes 3 horsepower, get 12 volt electric and be better off. (or, if you need mechanical pump, get high pressure high volumn 348/409 pump)

[@Spiritof_76]

Wow. Why would a 283 need a high pressure high volume fuel pump? An oem style mechanical pump will do fine.

[@rosstempletonogskater]

How did it run???

[@Dan-ez6dr]

Head bolts don't bottom out bro

[@robertedwards7632]

1205 felpro

[@notintohandles]

How did it work out?

[@notrodtv6113]

When I have money I have no time when I have time I don't have the money. lol, The project is on hold right now.

[@stanleyspurgeon5339]

I’m going to do the same thing you’re gonna do I have a set a 305 heads and I’m gonna put them on 283 I was told by an engine rebuilder with a stock 350 cam around 9 1/2 9 to 1 compression you should get around 230 horse basically a 305 has the same as an early Chevy head it just as hardened valve seats and those are the heads he told me to get the original heads would cost more money to rebuild because they did not have Harden Valve Seats How much horsepower are you wanting to get with this build 283 is never really developed that much horsepower I think the most ever made was like 210 horse

[@notrodtv6113]

I am expecting about the same 230-240. my engine guys says 250 but probably blowing a lil smoke up my ass. As long as it sounds cool.

[@gregmarkwood57]

283 corvette engines from 1957 to 1961 made 270 hp , with 9.5 compression ,power pack heads , 097 solid lifter cam and dual 390 cfm carbs . With a 4speed , 4:11 gears and low restriction air cleaners these engines were music to your ears . Also in 1961 a rare factory aluminum head 283 with fuel injection was rated at 315 hp . The factory built at least seven different versions of the 283 , from 180hp to 315hp .

[@MasterWitchDoctor]

@@gregmarkwood57 the Duntov engine was a beast, many 283 powered Chevy IIs have put cars with 350+ cubic inch engines on the trailer.

[@SlickD217]

Ever get it running??

[@reeferreborn3245]

lol No, I kind of lost a lot of room in my garage. and got sidetracked. I will upload if I ever get on it again.

[@jonminnella4157]

305 head dosen't that lower the compression ratio

[@notrodtv6113]

these CC at 57-58 I believe it was and the same for my Power PaKs. The shape of the bowl is different Not sure what is better shape. I do notice part of the bowls looks to be ground out to allow some better combustion in the 305s.

[@jonminnella4157]

@@notrodtv6113 cool man thanks for the information I always wondered if a person could take a 305 from the 70s and 80's era and actually turn it into something good

[@thereluctantgearhead4544]

@@notrodtv6113 the chambers on the 305 heads is better than the old 283 head. The 081s are probably the best of the 305HO heads. They came on the TPI 305.

[@MasterWitchDoctor]

@@thereluctantgearhead4544 they also came on the 87/88 monte carlo ss

[@thereluctantgearhead4544]

@@MasterWitchDoctor also came on some boats in the 90s. I have a pair that came off a Mercruiser engine.

[@johnkelly8525]

Your joking 305 head , why they are Chevys worst flowing hp loss

[@v8sserieschevy917]

You just killed all power. Combustion chamber is to big. Use power pak head with 58cc

[@Spiritof_76]

They have the same size chamber and compression will be the same. Those aren't 350 smog heads.