[Scott Roberts]

Originally Posted by Dragncar

E heads, yes you do. SD has a test mule 541. Made 784 HP on pump gas with their non wide port 350 E head.
It took their 370cfm wide port on the 541 to get 825+ HP.
And the engine in question is a stock block 463ci.

High effort you could probably get a little more HP out of the above combos. 10.8 CR.
Still, the highest flowing std E head I know of is Dave Wilcox's 374 heads. Even that is not going to make 825-850 in a stock block-pump gas. Would not be easy with a 541 either.

SD is not the standard by which all is measured..they make nice stuff from what I hear but they live in the "safe " zone in my opinion... and yes, 374cfm can easily net you 825hp on a 541...

[Aaron Quinton]

Scott is right, my experience is similar but with high ports KRE heads of similar capability.

Originally Posted by Scott Roberts

SD is not the standard by which all is measured..they make nice stuff from what I hear but they live in the "safe " zone in my opinion... and yes, 374cfm can easily net you 825hp on a 541...

[BruceWilkie]

My quick guesstimator says 820-860 is doable with considerably more possible if you get away from pump gas. Think hi port is better way to go vs wide ports if you're locked into traditional heads. (Me I'm going CV1's and E85 13+ compression)

[slowbird]

So does cross section have anything to do with hp potential or is it just about the cfm?

[Aaron Quinton]

I'll answer and take crap for days. However, cross sectional area and approach angle are king, CFM is less important.

Originally Posted by slowbird

So does cross section have anything to do with hp potential or is it just about the cfm?

[Stan Weiss]

CSA, Velocity, CFM are all linked together. If you know any two of them you can calculate the third one.

Stan

[Mark G]

Originally Posted by slowbird

Who has made 825-850 with standard ports on a 460ish ci (stock block) engine on pump gas and backed it up at the track?

Stock block know idea Aftermarket block your about to find out ...

[blueghoast]

Originally Posted by jimmy daniel

But I’ll add this, I told Butler I wanted something I didn’t have to spend all my time working on. I wanted to race! I change the oil and adjust the valves maybe twice a year.

My 62-Tempest went 10.45@128 with 3350 race weight 3:73 gear.
440 CI, 325 eddy heads from SD-Performance and a Scott Brown cam.
Scott no's his stuff. Try him you'll be glad you did.

GT.

[Jim Robertson]

My #48s have the intake pushrods moved .225" (wide ported?) and my 468 runs same compression as yours with a much smaller cam than yours. It made good power for a head flowing 312 cfm thru the intake manifold and carbs. Intake port cross-section areas, shape and length is more important than raw flow bench numbers...IMHO.

[Fast 68 GTO]

I've been 9.95 in a 1968 GTO stock style suspension small tire at 3600 lbs with stock block and standard port edelbrocks
that flow 312 cfm 12.2 compression and .700 lift nitrous grind cam. the 9.95 was on motor and spinning.

[Dragncar]

Originally Posted by Scott Roberts

SD is not the standard by which all is measured..they make nice stuff from what I hear but they live in the "safe " zone in my opinion... and yes, 374cfm can easily net you 825hp on a 541...

I understand SD plays it safe, just like Butler. Sure, you could get your 825-850HP with Daves 374 E heads on a aftermarket block, but you are going to have to run a real cam and push the CR more than 10.8. Good carb and intake too.
It won't be as easy as falling off a truck. Has it even been done with a non wide port head ?
Anyone even make 850 with std E head on pump gas ?

[Probird]

Originally Posted by Dragncar

I understand SD plays it safe, just like Butler. Sure, you could get your 825-850HP with Daves 374 E heads on a aftermarket block, but you are going to have to run a real cam and push the CR more than 10.8. Good carb and intake too.
It won't be as easy as falling off a truck. Has it even been done with a non wide port head ?
Anyone even make 850 with std E head on pump gas ?

Never had mine on a dyno and not pump gas. Mine is a race car, no need for pump gas. If your serious about bracket racing use methanol. I have Mark G's old standard port SD 350/360 E-heads and cam. According to Wallace's calculators my 529ci is making 825 at the flywheel. My stock block 459" engine with a good set of Eheads that flowed 328 showed 775 Hp at the flywheel according to the same calculator. They measure 76cc's so not huge compression. If you believe calculators.

[Dragncar]

Originally Posted by Probird

Never had mine on a dyno and not pump gas. Mine is a race car, no need for pump gas. If your serious about bracket racing use methanol. I have Mark G's old standard port SD 350/360 E-heads and cam. According to Wallace's calculators my 529ci is making 825 at the flywheel. My stock block 459" engine with a good set of Eheads that flowed 328 showed 775 Hp at the flywheel according to the same calculator. They measure 76cc's so not huge compression. If you believe calculators.

Can you explain the , if your serious about bracket racing methanol comment. Not sure I understand.

[Mark G]

Originally Posted by Probird

Never had mine on a dyno and not pump gas. Mine is a race car, no need for pump gas. If your serious about bracket racing use methanol. I have Mark G's old standard port SD 350/360 E-heads and cam. According to Wallace's calculators my 529ci is making 825 at the flywheel. My stock block 459" engine with a good set of Eheads that flowed 328 showed 775 Hp at the flywheel according to the same calculator. They measure 76cc's so not huge compression. If you believe calculators.

I made 810 hp with those heads 505 no tuning nothing ran 9.40 @ 3260 lbs my new heads are a SD one of a kind .. Best of Luck ..

[GTOGEORGE]

Originally Posted by Dragncar

Can you explain the , if your serious about bracket racing methanol comment. Not sure I understand.

......alcohol.....Bracket Racing....you don’t have a clue huh!


GTO George

[Mark G]

Originally Posted by GTOGEORGE

......alcohol.....Bracket Racing....you don’t have a clue huh!


GTO George

I never use alcohol when racing.. lol

[GTOGEORGE]

Originally Posted by Mark G

I never use alcohol when racing.. lol

......well I never drink it while I’m racing......BUT after........!


GTO George

[Dragncar]

I think your drunk right now Georgie.
I asked a legitimate question and pop off and not say a thing that matters, like usual.
I do not run alcohol, never have and do not plan on it. But I would like a answer from a poster I respect, that would leave you out.
If it gives you more power, I know it allows you to run a ton of CR. OK , more power, does not help in bracket racing. More consistent, that might help but my car runs its number all the time so that would not help. Then you have to deal with corrosion ect.
Now you might want to dump that blower and turbo it. You see that turbo Pontiac on U Tube that makes 1250HP with a puny street cam ?
You might be of help if you had enough brains to post more them Molodex, Molodex, KRE,KRE,KRE, Babble,babble,babble. Empty your dribble cup George.

[GTOGEORGE]

Dragncar,
Why you gotta be Dick.....or in your case “pee pee”? LOL! Sorry but it (alocohol) does help in the consistency, when and if you every enter a Big Bracket Race (450-600 cars for first round) it helps. No timed runs (sometimes), racing all day and into the morning it helps, plain and simple! Yes I won plenty of races without alky but like I said it helps when Racing in a all day/weekend race......just saying!
That gas engine TWIN turbo made 1060 something HP at a tad over 12 lbs of boost......I’m making more HP with less boost (with an “Jurassic” roots type blower) but seriously who cares, except maybe just you! LOL! I love the looks and noise of a Root Blower and zoomie headers (my choice)! As for KRE I hardly mention them, others like you mention them more then me (as YOU just did)! They have “ALWAYS” have had my back so I will “ALWAYS” have theirs....case closed! As for Moldex they have one of the best cranks for a Pontiac, cant help it if you can’t afford it and besides you’re not making enough HP to need one! LOL!


GTO Georg

[Mike Davis]

Originally Posted by Dragncar

E heads, yes you do. SD has a test mule 541. Made 784 HP on pump gas with their non wide port 350 E head.
It took their 370cfm wide port on the 541 to get 825+ HP.
And the engine in question is a stock block 463ci.

High effort you could probably get a little more HP out of the above combos. 10.8 CR.
Still, the highest flowing std E head I know of is Dave Wilcox's 374 heads. Even that is not going to make 825-850 in a stock block-pump gas. Would not be easy with a 541 either.

Heads are a small part of combo. I have a small CID (446) stock block, 341 CFM Eheads, small cam (270@.050), 11.25 comp, puny Carter AFB carbs that is in the 770HP range.