recipe for 550+ wheel HP on a 408???
09-03-2013, 10:08 PM
#1
recipe for 550+ wheel HP on a 408??? So ive been searching around and can't find anything that can help me on making 550+ wheel HP
my setup:
6.0 iron block bored .030
4.000 manley crank
6.125 h beam compstar rods
4.030 wiseco pistons
ls3 gmpp heads
fast 102 throttle body and manifold
compression calculated at about 11.4:1
cam not specd out yet, but im working on that.
Anyone know if this will be potential 550 wheel horses? I know cam has to do with it too.. should the ls3 heads from gmpp be good or is there any better heads like AFR or tfs? Ect ect...
anyone have a recipe to make 550+ wheel? Ive seen some 408's make from 480 to 560.
my setup:
6.0 iron block bored .030
4.000 manley crank
6.125 h beam compstar rods
4.030 wiseco pistons
ls3 gmpp heads
fast 102 throttle body and manifold
compression calculated at about 11.4:1
cam not specd out yet, but im working on that.
Anyone know if this will be potential 550 wheel horses? I know cam has to do with it too.. should the ls3 heads from gmpp be good or is there any better heads like AFR or tfs? Ect ect...
anyone have a recipe to make 550+ wheel? Ive seen some 408's make from 480 to 560.
Last edited by mannyman84; 09-05-2013 at 02:33 AM.
09-04-2013, 12:38 AM
#3
TECH Resident
Ahh there is a whole thread on just 402/408 HP results. Check it out. IM sure you will find what you are looking for.
^^ like he said, you will be close. IMO, don't penny pinch on the heads no matter what, even if that means holding off on building your machine for another month or two. You gotta get that motor to breathe. Build your cam around those heads and you should be fine.
^^ like he said, you will be close. IMO, don't penny pinch on the heads no matter what, even if that means holding off on building your machine for another month or two. You gotta get that motor to breathe. Build your cam around those heads and you should be fine.
09-04-2013, 06:36 AM
#5
TECH Senior Member
You'll need better heads than those LS3s. Those will need to be properly tailored to the rpm range you wish to produce. That along with the right induction and the proper cam is very achievable in a 408.
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Fishmasterdan (08-29-2019)
09-04-2013, 06:59 AM
#7
If you to spend some cylinder head money I just dyno'd this past weekend my 416 with very good results. The TF 235 heads are modified extensively by Chris Frank.
We made very good power with what many would call a small camshaft, drive ability is a very big factor with me.
We made very good power with what many would call a small camshaft, drive ability is a very big factor with me.
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09-04-2013, 08:19 AM
#8
You might see just at or slightly under 500 with those heads and what I assume is an OEM manifold.
To get 550+ out of a 4.03 bore 408 you're going to need some killer heads and a FAST.
If you're stuck on using LS3 heads, get some MAST ones or ones ported by someone better than GMPP.
To get 550+ out of a 4.03 bore 408 you're going to need some killer heads and a FAST.
If you're stuck on using LS3 heads, get some MAST ones or ones ported by someone better than GMPP.
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elfgoat (09-25-2021)
09-04-2013, 01:56 PM
#13
I've got some AFR 230's for sale. Brand new! They were going on my 402 that would've made about 430 RWHP with a medium cam.
It's all about the head work to get killer flow and ultimately good rwhp numbers, if that's what you're looking for. I just wanted a motor that would go 10's.
It's all about the head work to get killer flow and ultimately good rwhp numbers, if that's what you're looking for. I just wanted a motor that would go 10's.
