AFTERMARKET LS HEAD TEST-STOCK CATHEDRAL PORT VS 10 SETS!

WHO WINS? FULL AIRFLOW & DYNO RESULTS-ULTIMATE LS HEAD TEST. 11 SETS OF LS CATHEDRAL HEADS. How much hp can stock LS1 heads make? Do ported stock heads make as much as after market heads? We tested more than a dozen sets, but this video included the best 11 heads. We measured port and chamber volumes, airflow in cfm from .050-.700 lift and then HP & Tq on the dyno. Full specs, airflow and power are supplied in detail.

[@bigblockmaro1]

All I have to say is: WOW. The sheer amount of work it would have taken to do this is crazy. THANK YOU!

[@richardholdener1727]

It was a lot-I didn't even include all of the heads in this video (cuz they were the same)

[@kensnyder2340]

I agree. Unbelievable workload.

[@mikeleschber33]

Lot of work....the kind I would live to do!

[@AndreS_-df2nw]

This the kind of testing everyone wants to see, but very few have the resources & contacts to pull it off.

[@jackstephens2519]

You should have seen the sbf tests he did back in the day. Absolutely insane!

[@bobqzzi]

A few things: 1. This channel should have 1M subs. Every day is another interesting video and this one was amazing. I mean the sheer time and expense of conducting these tests is staggering, but Richard delivers the info in a free 20 min video 2. It's funny as hell that they are all basically the same. Gear heads have been searching for the secret cylinder head forever. 3. I was in the engine business until about 2010 and just started to get interested again this year. The amount and quality of aftermarket parts has exploded, as has the amount of actual scientific information. Pretty remarkable

[@Frostekzz]

He doesn’t hide the fact that most of these are magazine tests from years ago, but he does a great job of packaging them nicely into a video format full of good info.

[@TractorWrangler01]

If this were the 1960s and 70s you would be right. There should be 1M subs. Unfortunatly because the laws got so strict on things like street racing and emissions ect that the boys have lost interest. It's become too complicated. Sensors everywhere, computers everywhere radar everywhere.. The government has nutered the sport.

[@bobqzzi]

@@TractorWrangler01 I don't think this is correct. Check out 1320 video or the Cleetus MacFarland channels

[@3800TURBO]

@@Frostekzz Richard actually did the tests. He's just revisiting them. He is also doing more tests currently. The cam test he did recently was great.

[@kidsteach938]

There's hardly 2 percent difference between any of these heads, telling me that the limiting factor here was the intake system air flow, or fuel delivery which was maxed at about 620 hp capacity.

[@Shane-Singleton]

I believe that Richard understands these things because, he himself, is also a machine. There's no other explanation for this gigantic amount of testing in every video. He's not human! I'm glad to see this channel grow. It is one of the most informative and interesting engine performance channels on KZbin.

[@cuzz63]

Single handidly making head builders step up their game.

[@baby-sharkgto4902]

2 handsidly

[@knowbull5hit590]

Alright Flanders lol

[@baby-sharkgto4902]

This must have taken a very long time to do! Thank you, Richard.

[@richardholdener1727]

Very!

[@Corsavette02]

There is a great article that was published around 2001 that details the developments of the LS6 head from the LS1 head, and why GM had to make certain choices and decisions to balance power vs exhaust management and emissions regulations. They learned some things from Lingenfelter, specifically that atomization as a result of the spray pattern from the injectors onto the back of the valves was not as influenced by the intake port design as they had originally thought. They further refined the port profile to reduce air restrictions while being careful not to disturb the spray pattern and this allowed them to increase the hp from 345 to 385 to 405 from 2000 to 2002 (with slightly different cam profiles), although they were still using pup cats after the exhaust manifolds to help comply with LEV restrictions. GM produced one hell of a head, knowing full well there was plenty left on the table, but not able to capitalize on it because of the cost of producing CNC'd heads vs cast. In the end they still had to produce a product that was cheap, met LEV regulations, and then made decent HP.

[@TheZach2007]

All I got out of this is save your money and port stock heads. And that every company is making the same product.

[@lloydholt6511]

Once again you shatter the bs. The best reason to watch your shows. You give the facts and let them be what they are. Fact or fiction. Keep making your videos and I’ll keep watching. Thank you.

[@garymathews4042]

you deserve a Nobel peace prize for tireless work .thank you too much .

[@Crysmatic]

TEA did with a 2.055" valve what Mast did with a 2.165" valve. my hats off to TEA! it seems to be a clear leader in this test.

[@TuLegit2]

THANK YOU RICHARD!

[@garymathews4042]

I am amazed at the TEA ported 243 heads numbers ,well within most builder budgets

[@petejoseph8257]

Great info here, Richard. All these head swaps have to be pretty time consuming. The fact these heads are within 1% of each other aside from the stock baseline head is amazing considering some are very expensive and some are kinda cheap cost wise.

[@Eidrian111]

I’m really amazed about the ported 243 heads. Such a great bang for the buck.

[@bcbloc02]

Modern engines already flow so well no surprise there aren’t huge gains to be had like in engines of old.

[@lorenzorossi8671]

if you were going to write an enciclopedia, you're definitely on the right path... analisys, conclusions & appendix. very well done again. love from Italy

[@shaneshane1379]

I'm not an experienced LS person hardly at all other than repairing stock engines. The engine I build for racing are still the same old small block Chevy and sometimes big block. Dirt track and drag racing. I have been collecting ls parts, blocks, heads, and whatever comes with. I scored a set of cnc procomp ls1 heads one time and never used them YET. I think they are the same thing you just test and if so, I'm very pleased. I'm pleased because I'm planning a Na build of a all out racing ls engine. 16 to 1 tunnel ram engine. I haven't seen any all out na ls engines yet but I'm sure there are plenty. Thanks for your hard work, it's great.

[@raymondwalker2109]

this guy does everything I would never have the time or money to do

[@thomasworrilow4228]

For me it would either be TFS, MAST LS3 SMALL BORE or TEA ported factory casting. I would also probably opt for the stage 1 instead of the stage 2 from TEA though. Thank you for all your hard and amazing work.

[@bossgoss2284]

I have a 5.3l from a 2001 Yukon, and it sets in my 64 C10 , and because of you Richard , without any knowledge what so ever , I am confident that my setup is screwed... lmao... I now know that my heads need replaced or massive upgrades and the cam that I want to run will not work for the application that I am going for and this has made me realize that I need to throw a set of remote gt45 turbos and just let it eat. ( after ring clearances and valve springs and replacement head gaskets along with lifters.... oh and an electric water pump...lmao) thanks for giving me the confidence on this new platform to know that when I do something to the motor that if I don't do more safety than I think is needed then all I have is to blame myself.... ) because you my friend have shown me the proper and most efficient way to make a LS based motor live and make HP... thanks again for all you do!!!

[@patbartholick7845]

Great information on how to spend more money, but do it wisely. Thanks for sharing your knowledge so others can play along.

[@chrismiddleton6658]

I wanna see how the Frankenstein heads (Ported 243 Stg 2, and F110s) stack up. 😍

[@W4RH4WK_W468]

Just the test I was looking for. Very informative and helpful. Great Work Richard. Keep'em comin

[@YuccaSpeedShop]

You have done the work to answer the questions we all had. Congrats to you sir.

[@unclesquirrel6951]

Almost 70000 mr ! Awesome, you'll be in the 100K range in no time

[@deanstevenson6527]

John Woodworth : Correct me if im wrong but isnt this about the only time it wasnt squirrels John....?

[@indyrock8148]

@@deanstevenson6527 he must have slipped up. Or possibly reconciled his differences with squirrels?

[@baby-sharkgto4902]

@@deanstevenson6527 AWESOME comment

[@baby-sharkgto4902]

@@deanstevenson6527 the squirrels made him do it....... yes, I blame the squirrels

[@richardholdener1727]

thnx for the support

[@PetesGarageandperformance]

Richard your channel is really growing! I remember the tests you used to do for the Mustang magazines 20 years ago and always thought it would be exhausting to run all of those tests (shootouts). Great idea to save that info and present it in the KZbin format. Hats off to you, sir!

[@richardholdener1727]

thnx-I need to post the Ford head tests

[@KTger]

No surprise that TFS 235’s lead in Avg HP/TQ and right there at Peak HP and tied for Peak TQ with the larger AFR 245’s. Brian Tooley did an amazing job designing some of their heads and this goes to show that on smaller notes that consumers should pay attention at the air flow numbers at mid lift and not focus just the flow at higher lift. Hotrod Mag did a similar test years ago and TFS 235 led in all categories too.

[@richardholdener1727]

same test-I did that for Hot Rod

[@InFiD3ViL1]

Overall Top 3 from what I am seeing for avg. power, peak power, peak tq, and avg. tq : TSP 237 TFS 235 Mast LS3

[@baby-sharkgto4902]

Did you even see the AFR's?

[@stevenwhite7839]

Hi, Here is an idea for a test. Chevy says that there is a limit to the amount of overlap that will produce more power with a street-type exhaust system due to the lack of pressure wave tuning. Test "stock with mufflers" vs "open headers" varying only the overlap from stock to typical drag race values.

[@tjmoneybags]

If chevy spent millions and tells you that's what they found....why redo it?

[@trlprk]

I love the honesty about the pro comp stuff, ringer set

[@randystingray6544]

I see Dr. Richard Holdener is at it again!! Man you turn the wrenches for sure. I just happen the have the 230 AFRs on a 427, they seem to work great for me.A ton of info here for sure.....

[@jamest.5001]

I may been way off base, but when planning my 385 stroker build, I studied 350, 383&400ci dyno graphs, and it seemed the peak power dropped off faster on a 383, with the same type head , compared to a 350ci. That's what lead me to the 220cc aluminum heads, it's been in storage for years, (I had a series of disasters, I moved, then the house burned DOWN!) But hopefully with a cam upgrade, the TQ down low should be good, with the longer stroke, and hopefully power should keep climbing to around 6500, insted of around 4500- 5000, I know there are alot of unconsidered variables, even different dynos, different engines, and I'm comparing somewhat stock engines stroked, to 383, my engine is obviously a notch or three above that, forged everything, studded, balanced, I just need a good roller cam up upgrade, I have the biggest comp nos hp, flat tappet, it's not even a race engine! But sometimes maybe a trip down the local 1/8, I have considered the trade-offs, I now need to find a deal on a T-56, or a TKO 5speed, I was going to try the stock t-5, but no point in breaking it! I should exceed the tq specs by 2-3 times, and then a 3.73 gear for my 12bolt, since I have 28" tires, I have considered a 4L80, but it would kill me to swap to auto, in my 88 formula, I may put this engine in something else, it is fact, the potential is between the heads and cam! Great video!

[@wilsonjefferies294]

Great video! Always respect the amount of detail you go into. Just as a future video suggestion, ls injector shootout/ de capped vs stock vs flex fuel . Think it might make for an interesting video.

[@SuperFuzzyman123]

I was hoping for something like that myself

[@C5Z06CarGuy]

One thing that was holding back the power on the aftermarket cylinder heads was the intake lift on that cam (.617). How much lift you can benefit from, directly correlates to valve diameter. For a good flowing set of heads like these aftermarket sets, you'd want a lift-to-diameter ratio of .30:1. Giving you an ideal intake lift close to .650 on some of these heads. I'd love to see this test done with lift optimized for the bigger valved heads, since the smaller valve heads won't lose power from too much lift, they just won't benefit.

[@baby-sharkgto4902]

I know first hand that the AFRs in this video are for a max lift of 650 and the Trickflows a max lift of .600 per the manufacture

[@Dr_Xyzt]

I don't trust the lift-to-valve-diameter ratio very much. -- If you have a small port with a fat valve job, the setup will work differently. -- The D/L ratio I trust is 4:1 + the seat width. -- Also, if you have different mathematical definitions for a given cam profile, using additional "Useless lift" can have a different outcome with a square engine vs an oversquare engine. -- Bolt it up and run it on the dyno, buddy.

[@C5Z06CarGuy]

@@baby-sharkgto4902 The max lift on those Trickflows is based on the spring they send them with.

[@rustyjunk9008]

You are the open and honest source.

[@richardholdener1727]

try to be

[@pault8697]

Thanks Richard good to see the factory 243 heads ported make good power and torque half the price for me to get my 243 cnc ported than buying a new set of heads thamks.

[@kieranproven4874]

Wow, you are a legend. Thank you for putting so much time into this video. All the power fiends love your work.

[@richardholdener1727]

Thank you very much!

[@dylanschaeffer5106]

I’d like to see this same test done with a big cam and super Vic. I feel like this setup was only going to make about 625 hp no matter what because of the cam and intake restriction. A cam and intake that makes power to 8k+ will really show what head does what.

[@coalstang]

your videos are excellent man. a person can confidently build something spectacular by using all the things you share for free. great work👍

[@javiertablas-tapia7388]

Thank you for all the work you put into making these videos. Thanks to you I’m in the process of building my own 408 stroker for my Toyota pickup. Keep up the amazing content!

[@shanebrownlee69]

I'm shocked that this video doesn't have well over a million views.

[@cedricandrews3874]

Great videos, I hope you do another book about engine combos with this updated information ( LS only). I'm planning on putting the summit stage 4 cam, in a 2008 manual Corvette. It's going to be a beast. Thanks man.

[@Dr_Xyzt]

A lot of these heads were great. I'd take a close look at the AFR 245's, TFS 235's, TSP, and the LPE heads since they're dedicated castings. I like the LSXRT intake on a cathedral head because it gives you long straight runners. Plus, it's noisy and fun. The TEA heads are good too, but I'd want to really know how thin those OEM castings have been machined. The MAST heads are good when you look closely at 5500 RPM, since you get to use the LS3 intake. Excellent choice.

[@indyrock8148]

Those procomp heads were definately hand finished. But... It does go to show what a little TLC is worth on any head. Finished chambers, blend VJ, bowls, very easy basic stuff really.

[@Apachefog]

If they were a set of ringer heads. It makes you wonder why they dont just program that spec in to their cnc.

[@baby-sharkgto4902]

@@Apachefog great point

[@matthewfoggon3893]

Honest, factual and very helpful!

[@AMGmechanic]

Hey Richard, how about an LS, N/A, daily driven engine combo shoot out?

[@chezleymcdonald2481]

Man you put the work in for sure! Poor tear motors lol keep up the great information and hard work it’s going to really pay off! 👍💯

[@scarletpariah6563]

Ton of work there. I dug up an old set of RHS pro elite 11° 225cnc heads. Never found data on them but liked the design. Should be as good as the newer heads. Have great ptv clearance.

[@richardholdener1727]

I think Mast made RHS heads for a while-those r good

[@francfurian8215]

That was an excellent comparison! Thanks Richard. Cheers😊

[@rekleif]

Would love if you could put the cu.in to litre conversion in text when you edit these videos. Best engine channel on YT, I have learned more than I will ever need to know. Thank you mr. Holdener! Love from Norway.

[@richardholdener1727]

THE 408 IS 6.68 LITERS

[@bigal878]

Bloody top job Richard, much appreciated mate 👍🏻

[@ezmny1387]

reason why those procomps make so much power is because the runner is way smaller than the others, if a head flows the same as another head but is much smaller that = more air speed and will make more power. also pretty sure the mast small bore has a 2.08 intake valve, as far as im aware thats the biggest valve you can fit on a 3.9" bore 5.7L ect

[@johndowling6131]

Now we need a bang for the buck comparative chart

[@Rome3aaro]

I think I need to get me some ported 243s🤣 thanks man

[@abdullaalameri90]

10 sets of head. Just wow. I would have changed career after the 3rd head replamcment.

[@Drunken_Hamster]

So what's best for the money, and what's best regardless of the price? Same question for Rec port heads. My application is a 6.2 LS3 in a Gen 5 Camaro with a forced induction future but N/A for now. Trying to keep low-down losses minimized, too, and I want "best" to be categorized as David Vizard might do so, so taking into account coefficient of discharge, swirl factor, and all that other stuff that paints the full DETAILED picture, rather than plain old raw flow numbers.

[@richardholdener1727]

Come to grips with the fact that there is no BEST.

[@joshmitchem5140]

Great work Richard. I really enjoyed this video, tons of information as always. Thank you.

[@scottmurray2961]

Thank you for your hard work and expertise and one of these days I may change mychange my heads out to 1 of these set such a heads now at least I have an idea what I'm looking for I'm looking for thank you very much

[@Broncofivepointslow]

Rich your videos are awesome. Heres a curve ball for you. How would someone young get into the industry to be involved in the awesome stuff you get to do? A lot of people are envious of your job and the toys you get to play with lol. If you dont have any direct advice, let's hear about how you yourself got the job or jobs that lead you to be here and making these awesome videos. To me that's just as interesting as learning about engines so maybe food for thought for a future video? Thanks for all the time and effort you put into this channel.

[@richardholdener1727]

I wrote my first story by accident for Turbo magazine-just kept doing it

[@genemounce8302]

daaaaaaaaaaaaamn, this dude never sleeps. lol

[@95Sn95]

Yeah deff Richard is a busy dude

[@JingleBop]

Another fantastic video. I just can't understated how you pump these out so quickly

[@funfun8095]

Old tests.

[@Frostekzz]

He doesn’t hide the fact that most of these are magazine tests from years ago.

[@gregwestphal]

Yep, 10 years ago for this one.

[@richardholdener1727]

nothing to hide

[@funfun8095]

@@richardholdener1727 Nope, nothing to hide. Good catalog of tests. 👍👍👍

[@opieg7333]

Any reason why the Texas Speed heads seem to peak at a higher RPM? And this data is awesome, I have long had a excel sheet with a bunch of the "stated" airflow information but it is refreshing to see so many options tested independently. Nice to see most of the data is consistently below what's in my spreadsheet and I know all tables flow different so finding a fairly consistent difference at least gives me some confidence most manufacturers are giving fair flow numbers for their products.

[@MadAdventure919]

Bravo.. Excellent video.I went with rectangular AFR 230cc head on my 408.

[@thehappytexan]

By the data, the tsp and tfs heads look the most streetable and have the flow numbers to support boost. But the ported stock ls6 heads would fit the bill for 90% of us and be much cheaper. Those 6 bolt prc heads are just begging for a stouter block and copious amounts of boost though.

[@viciousrap700]

Great test, Richard! I would love to have seen a set of 243's ported by Elliot'sPortworks, Lloyd does some great work, check him out! He's an amazing guy to deal with also!

[@geoh7349]

they pretty much all made the same power. so the limiting factor is likely the cam. the head flow on these units never reached their limits so the engine basically made all the power that cam could make. pretty sweet test. since we could put those heads on a flow bench and can see what their theoretic limits are then chuck a cam that is close to that in it then see who is truly big dawg.

[@baby-sharkgto4902]

Probably some of the limiting factor is cam but the real limiting factor is the C I. of the engine.

[@tiitsaul9036]

Thanks for sharing. I’m really looking forward to your daily updates.

[@mxguy2438]

Great content. Can't wait for the deep dive analysis video!

[@flexjay87]

I am considering buying a truck, and want max Torque. Looks like the Trick Flow would be a good choice, considering Average Torque.

[@patricktisdale9603]

Great job 👏 Your work is greatly appreciated 👍

[@finnroen2334]

Thank you. I think the TFS235 won pretty clearly.

[@MountainPF]

For average power, yes, but procomp had higher peak power and torque and had a smaller port volume which would make it more responsive. All the heads are so close it doesn’t really matter.

[@brettwarren3429]

Matvey Kulgavyy is go TFS or Texas Speed over Procomp.

[@EGGINFOOLS]

TSP

[@ShizawnSanders]

What intake manifold was used on the Mast heads? Was it a stock LS3? If so, that seems to be the best. Didn't lose ANY power over LS1 at ANY point and still made 620HP. A stock LS3 intake manifold is going to cost a lot less than a FAST too.

[@howardfry419]

Looking to see if you've done a "Throttle Body " test. Comparing a CNC to a standard and a stock vs a larger 103mm (ish.) On the same long block combo. Oh an let's see a BBC or Ford big block , for a change. Keep up the great work

[@richardwimmer6846]

Awesome work! Like one stop shopping for all us Gearheads...

[@trentdawg2832]

So the cheapest set of heads made the most power......now I remember why I bought 3 sets of pro-comps.......2)64cc ls3 ...1)64cc ls6, and they worked great on all 3 motors. .......

[@jacklynch6089]

I would Love to see LS 408 High compression vs LS 408 Turbo

[@willsperformancetech2933]

Awesome!! Thanks Richard, for all this work you are doing for the community. How about ls3 vs ls7 intake and heads comparison? Keep it up!!

[@richardholdener1727]

those are different motors

[@willsperformancetech2933]

@@richardholdener1727 I have a 06 gto ls2 with ls7 intake and heads, and a TSP 220-220/ 600-600 115 lsa and the car feels with a monster torque. All I did was refreshing the bottom and heads , intake, cam swap.😁

[@SF-wu2mp]

Awesome video! Exactly what I’ve been waiting for, this should make shopping for heads for my 6.0 way easier.

[@tdalb8985]

You make good videos. Is that a 50 hp gain between stock and aftermarket? I've been thinking of cam and heads, just trying to calculate the expense to decide if it's worth it to me.

[@cathymcgrath8320]

First thank you for all you do for the hot rod cumunity, after watching the video, and mostly repeat performance s I wonder if the intake was influencing (restricting) the test numbers. You would think there would have a little more of a spread between the best and worst unless there was a restriction somewhere else, would be interesting to see a better flowing int or bigger throttle body would change the spread. Thanks again for all you do, keep up the good work.

[@richardholdener1727]

neither the intake nor tb were restricting this motor

[@josephyslas4615]

My set of ported and polished 706 heads compare very closely in flow with the dart pro 1s and the Edelbrock LPEs. Same compression, 4.005 bore (402 stroker). I'm excited to get it back on a Dyno and see what it makes. Last chassis Dyno read 350/350 and I believe it was reading way off according to my ricer math (one car ahead of my buddy with a 3100# 350-400whp 5.3 12.0x car vs a 4700# 402 truck one car behind). This video makes me feel better lol

[@lazylizard6532]

Are the AFR 245 heads so different from “AFR 210cc LSX Mongoose Street Cylinder Heads” that this test tells me nothing about the 210s? Dreaming about an LS1 383 stroker with a T56 for cross country driving. Trans doesn’t like to shift over 6000 RPM so low and mid RPM power is my goal.

[@andrewking4727]

Thank you, Richard, for all the great information, sweat, hard work & $$ you do! Bravo!

[@toddformanek8495]

Thanks for another great informative video!! I'm assuming that these were all run 'out of the box' and the valves were not lapped? The reason I ask is because I have heard and read that ALL 'out of the box' assembled heads leave power on the table with less than stellar valve to seat sealing. Have you found this to be true with these aftermarket ls heads?

[@TopAnimeGuy]

Guessing all the power curves look the same because the came is the same through out. More than likely the heads are big enough for the cam thus we see the full potential of the cam shaft with each head. If the head was too small the power numbers would suffer. This shows that the cam that was run is a good option for all these heads but also that these heads can run more radical camshafts and make more power. Besides we still have yet to add BOOST!

[@Termin8r27]

AMAZING work, thank you!!!

[@ryanaxberg9263]

I think it would be intersting to see the ported ls1 heads vs the factory ls1 heads to try to see what they all did as far as porting, so I could try to duplicate it next time I take a stab at porting

[@richardholdener1727]

look at the ported LS6 heads-ported LS1 are very similar

[@MattPratt]

Great test. I know the prices have probably changed since the test, but a bang per buck comparison would have been good.

[@richardholdener1727]

i had pricing in the original story

[@mrmysterious6006]

Richard this was a great test however there are a couple things. First of all it's great you used the AFR 245cc head. However this head does not work that well on a 4.030 bore. It needs a 4.125 bore size at least for max potential due to valve shrouding and also it was designed for 427+ engines. I'm surprised it did as well as it did though. The trickflow 235 head was properly sized for that size engine although, Trickflow recommend this head be used for 416-427 engine because of the larger bore. Their 245 head recommends a 4.155 bore for max results. Please do this test again on a 427 or larger LS engine. Please!!!!! Oh and also include the trickflow 245cc head too. Good to see you used the FAST 102mm intake. Great match. This is one of my favourite tests you have done so far.

[@richardholdener1727]

I think I pointed out smaller AFR head would work

[@mrmysterious6006]

@@richardholdener1727 yeah you did. I wish you used the AFR 235 head instead of the 245 head. If you read around the forums there is a great debate between the Trickflow 245 and AFR 245 head and which one is better etc. It's never been settled. On Paper the trickflow appears better but is it really? I have a set of AFR 245cc which have been customised by Tony Mamo but am waiting on my engine to be built.

[@baby-sharkgto4902]

@@mrmysterious6006 I like Trickflows and have their GenX 225s and they're great. I recently purchased AFR 245's (wont be here till Tuesday) I would have probably went with Trickflow again (just because I'm familiar with them) for the 245's but Trickflow only offers 245's in a 6 bolt and I didn't want the extra bolt bosses sticking out looking all weird if not using them so that pushed me to the AFR 245's.

[@dinukap4]

Good stuff, lot of hard work gone into making these videos keep it up ! And if you can do a research and test dimpled, rough, polished intake ports to see what makes best HP.

[@kevinbuzzell1047]

Richard, awesome, but you still haven't should us the L77 motor yet. when can we expect the video you promised us.

[@mannieecker8602]

I like the way the Texas speed and the TFS235 heads look on the power graph....Maybe a slight edge to the TSP head. Would also be a plus if we knew the air speeds to give us an Idea of how the port might recover after gear change because this is Important at least 2 times on an auto trans and more on a manual trans. I have seen before where the Lift Diameter ratio kept picking up power to .35 L/D and more but I do not think this would apply to this test engine unless more compression and the rpm range was moved out a good bit. As it sits for this test there is a good amount of airflow left in these test heads. Great work Richard how stable was the air density throughout this testing marathon?

[@kkmfc3s]

Would like to see a bb mopar head test. Also an engine build suited to a 4x4.

[@marcocasillas5023]

Thank you and your team for all your hard work on this real good information thanks

[@TractorWrangler01]

Which raises a curiosity.. Why do these heads lose any power at all on the bottom end?

[@richardsonracin-lw9zi]

Great video! Thanks for all the work

[@95Sn95]

Cleatus's had a LS1 in leroy and put a set of Texas speed cathedral port heads then got a 7.0 short block and installed those heads on it and yes it has twin turbos but I think he made 1300hp or so to rear wheels with those cathedral port heads on a 7.0.

[@richardholdener1727]

lots of guys making 2K hp on cath heads

[@pancudowny]

I have one small question, Richard: When were all these tests done? Because now that bolt-on, self-learning TBI systems exist, this would be the way to go with testing on apps you'd usually involve a carburetor since it's what today's new, younger builders are likely to go with on their builds. Plus, the annular discharge bores... used by some of the models on the market... would prove to be advantageous on forced-induction apps, where creating a "fog" of fuel would allow better mixing.

[@richardholdener1727]

no bolt-on, self learning system (especially a TBI) and carb-style intake will do what the Fast intake and tuning do

[@luismandujano3977]

Binge watching Richard @ 2Am Love the video! Keep it up man. Love your info can't get it nowhere else!

[@Thevlones]

So a 5.3 could take those mast rectport heads ?