Boosted head choice ??
Boosted head choice ?? Hello, I'm looking for some input on which heads to go with. (Quick rundown) Forged 370, F1-R, iron block, C5Z, 6 speed. I'm in the begining stages of the parts collection. My question basically comes down to this, will I see a real performance gain between the 317's or the L-92's. Basically a 9.5:1, spinning 7000RPM @10-14 PSI setup. I own the 317's already so that right there is an advantage. Its going to be a semi-budget build. Not trying to spend every dime, but willing to spend 1,200-2,000 $$.
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
TECH Enthusiast
Joined: May 2008
Posts: 537
Likes: 1
You should look at WCCH's Stage 3 L92 heads. Flow numbers are very good, should run well so long as you don't get too high with boost.
Shooting for 10-14 psi with a 370, curious why you choose F1-R blower over F1A.
Shooting for 10-14 psi with a 370, curious why you choose F1-R blower over F1A.
I'm not a procharger expert but the intake side of the F1-R blower seems to be the advantage. R meaning reverse. Intake facing forward. I talked to tech at procharger and thats what they recommended for my C5Z setup. But I would love to here your opinion. Like I said, I'm no centrifical expert.
Thanks
Thanks
Launching!
Joined: Jul 2008
Posts: 249
Likes: 0
From: cookeville, tn
I'm not a procharger expert but the intake side of the F1-R blower seems to be the advantage. R meaning reverse. Intake facing forward. I talked to tech at procharger and thats what they recommended for my C5Z setup. But I would love to here your opinion. Like I said, I'm no centrifical expert.
Thanks
Thanks
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Hello, I'm looking for some input on which heads to go with. (Quick rundown) Forged 370, F1-R, iron block, C5Z, 6 speed. I'm in the begining stages of the parts collection. My question basically comes down to this, will I see a real performance gain between the 317's or the L-92's. Basically a 9.5:1, spinning 7000RPM @10-14 PSI setup. I own the 317's already so that right there is an advantage. Its going to be a semi-budget build. Not trying to spend every dime, but willing to spend 1,200-2,000 $$.
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
__________________
ATI ProCharger and Moser Sales 260 672-2076
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
Ok, lets try a new angle. Lets say I will make 750 at the tire with the 317's. How much am I leaving on the table buy not stepping up in the head department ?? Of course boost, CI, RPM, blah.....(you get the picture) being the same. Be it cathedral or rectangle port. I'm trying to put a dollar value on the HP left on the table. Example if I put on the top dollar AFR's and pick up 100 HP at the top of the RPM's, well thats hard to justifiy for $3,000.00 tag. And I think 100 HP is a bit high, but thats why I posted the question. So lets here what you think.
O' yeah, one angle I can think of would be by stepping up to better heads, the deck tends to get better. Which would lend itself to more boost. AKA more HP. As long as detenation is kept cool
O' yeah, one angle I can think of would be by stepping up to better heads, the deck tends to get better. Which would lend itself to more boost. AKA more HP. As long as detenation is kept cool
Hello, I'm looking for some input on which heads to go with. (Quick rundown) Forged 370, F1-R, iron block, C5Z, 6 speed. I'm in the begining stages of the parts collection. My question basically comes down to this, will I see a real performance gain between the 317's or the L-92's. Basically a 9.5:1, spinning 7000RPM @10-14 PSI setup. I own the 317's already so that right there is an advantage. Its going to be a semi-budget build. Not trying to spend every dime, but willing to spend 1,200-2,000 $$.
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
SO, out of the box comparasion 317's vs L-92's
or lightly ported 317's vs L-92's
Also deck thickness to be factored in. What this really boils down to is catherdral vs square port in a boosted application.
Any serious input is appreciated, Thanks
otherwise, We still have 317 heads in stock, ported, 5 angle valve job, 2.02"/1.57" stainless valves, dual springs. $995
Ok, lets try a new angle. Lets say I will make 750 at the tire with the 317's. How much am I leaving on the table buy not stepping up in the head department ?? Of course boost, CI, RPM, blah.....(you get the picture) being the same. Be it cathedral or rectangle port. I'm trying to put a dollar value on the HP left on the table. Example if I put on the top dollar AFR's and pick up 100 HP at the top of the RPM's, well thats hard to justifiy for $3,000.00 tag. And I think 100 HP is a bit high, but thats why I posted the question. So lets here what you think.
O' yeah, one angle I can think of would be by stepping up to better heads, the deck tends to get better. Which would lend itself to more boost. AKA more HP. As long as detenation is kept cool
O' yeah, one angle I can think of would be by stepping up to better heads, the deck tends to get better. Which would lend itself to more boost. AKA more HP. As long as detenation is kept cool
Here's a Boost formula (I think it's the right one...well it works) to give you an idea.... engine flywheel hp X (your boost level/14.7) + engine hp= new engine hp. Other words for example your engine makes 400 (off boost) X 1(14.7 lbs for example) +400 (original flywheel hp)= 800. So if you get 425 flywheel (with a better set of heads) than this would equal out to 850@14.7lbs of boost....So, yes a better set of heads will help. But.....You might already be maxed out on your turbo system where you'll just make more heat with no real hp change....If you have a blower you'll need to pulley up to get back to the original boost level, or you'll see very little difference in hp. Even @ 14.7lbs you see that you would only gain 50 (everything being correct). Most cars make 20-25rwhp per lb of boost. So, in therory an extra 1 1/2 lbs of boost would equal the same amount of flywheel hp. As you go big though this restriction to air flow (your heads) will cause more and more hp loss. It all depends if you want all available power out of your set up or you want to save the money and just run a little more boost to compensate....
TECH Resident
Joined: Jan 2009
Posts: 873
Likes: 1
From: oakland, ca
for my d1 build i went with prc 2.5 ls6s..they are working fine so far for me i made a max boost of 13.7lbs at 6500 on the dyno no issues with lifting...keeping my fingers crossed...If money was not an issue i would go with TFS ported by TEA..
