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Head flow = horsepower

Posted By: dustyswinger

Head flow = horsepower - 02/16/12 05:52 AM

Last year one of my heads sprung a leak and I think it's time to upgrade. I have a stock block 416 with a mechanical cam 265@.050 with 600 lift, 11.25 to 1 compression, factory cast iron heads that flow 271 and 171, a 1 7/8 headers, victor 340 intake and a 950 hp carb. My question is what should i pick up going to a set of ported edelbrocks that flow 299 and 218 and a super victor. My motor made about 515 HP and touqe before the change. Im looking for reduced ET.
I can also get a roller cam set up The specs were 260/266 degrees duration at 0.050 and 0.683/0.657 lift but I think that would be a little too much for a stock block.
What do you guys think? Thanks Craig
Posted By: fasthawk6

Re: Head flow = horsepower - 02/16/12 12:05 PM

If your going to go roller use indys and i would say a 100 hp gain. I personaly went from the indybrock and a soild lift cam with your same intake and carb to a roller ,indy-1's and there intake and picked up 8mph but the intake and heads are cnc'd.

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Posted By: FlyFish

Re: Head flow = horsepower - 02/16/12 01:26 PM

What dose your car run now, and what ET are you shooting for?
Posted By: fishy340

Re: Head flow = horsepower - 02/16/12 03:03 PM

fyi your not gonna need a r block for 600 or 650hp...it is nice to have,but not a must. there strong not like 440 blocks
Posted By: viperblue72

Re: Head flow = horsepower - 02/16/12 03:26 PM

I would guess about 3 tenths gain. I don't think standard edelbrocks are the best choice for you but they will work for an economical stand point. You'll gain a little compression also.
Posted By: dustyswinger

Re: Head flow = horsepower - 02/16/12 04:32 PM

I have a cam motion cam right now. That lift is alot to me too. The car has run the best of 10.43 at 127 but normally runs 10.50-10.60 and 126. It 60' in the 1.38-1.43 range. I am trying to get 10.20 I think with just the heads I would get there. With the cam who knows. Thanks Craig
Posted By: rt66jim

Re: Head flow = horsepower - 02/16/12 04:47 PM

Quote:

I have a cam motion cam right now. That lift is alot to me too. The car has run the best of 10.43 at 127 but normally runs 10.50-10.60 and 126. It 60' in the 1.38-1.43 range. I am trying to get 10.20 I think with just the heads I would get there. With the cam who knows. Thanks Craig



What does your car weigh?
Posted By: mbogina

Re: Head flow = horsepower - 02/16/12 05:32 PM

Basic rule of thumb for HP "POTENTIAL" is (cyl head flow at 28") x .257 x (number of cyls). Many high end builds can exceed this, milder combos will never reach it.
Posted By: dustyswinger

Re: Head flow = horsepower - 02/16/12 06:29 PM

3165 with me in it
Posted By: Dodgem

Re: Head flow = horsepower - 02/16/12 10:28 PM

Well 40 lb off with aluminum heads thats .04 to start and an easy .26 of in HP gain!
Posted By: dustyswinger

Re: Head flow = horsepower - 02/29/12 06:54 AM

I ended up buying the whole deal and deceided to put a steel crank and set of rods in it and let it buck. I'm kind of on a budget here and have found a scat crank for 640, a K1 for 689 and BPE has them for 629. Any opionions on these cranks? Just looking for a decent product for the best price, just like everyone else. Thanks Craig

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Posted By: dartman366

Re: Head flow = horsepower - 02/29/12 07:10 AM

Quote:

I ended up buying the whole deal and deceided to put a steel crank and set of rods in it and let it buck. I'm kind of on a budget here and have found a scat crank for 640, a K1 for 689 and BPE has them for 629. Any opionions on these cranks? Just looking for a decent product for the best price, just like everyone else. Thanks Craig

All good crank's, but I were to do another smallblock I would go with a BPE just because Rod is a really good and standup guy and has thought his product out.
Posted By: S/ST 3040

Re: Head flow = horsepower - 02/29/12 03:39 PM

Cylinder Heads and Horsepower
Posted By: Brian Hafliger

Re: Head flow = horsepower - 02/29/12 04:28 PM

I'm looking forward to seeing the results!
Posted By: BPE

Re: Head flow = horsepower - 02/29/12 07:34 PM

Quote:

Quote:

I ended up buying the whole deal and deceided to put a steel crank and set of rods in it and let it buck. I'm kind of on a budget here and have found a scat crank for 640, a K1 for 689 and BPE has them for 629. Any opionions on these cranks? Just looking for a decent product for the best price, just like everyone else. Thanks Craig

All good crank's, but I were to do another smallblock I would go with a BPE just because Rod is a really good and standup guy and has thought his product out.



I might be a little biased but I would get one from BPE. Sorry I couldn't help myself.

Rod
Posted By: onig

Re: Head flow = horsepower - 02/29/12 09:43 PM

Quote:

Cylinder heads and HP



Link does not work.
Posted By: S/ST 3040

Re: Head flow = horsepower - 02/29/12 10:38 PM

It should work now. Maybe an I-phone can't do everything.
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