416-418
 

im building a ls3 416-418 with tea stg 2 ls6 heads super vic intake accufab 4150 throttle body.cr 11.7-12.0 cam in the range intake 247-251 exhaust 255-260.
hoping to get 600+ flywheel horsepower.and then use 200-250 nos.do you guys think it will make 600+ without nos

Why wouldn't you use Ls3 heads

i started out building a ls1 but got a good deal on the ls3 block.the heads was gonna go on the 5.7

I think you'll be in the 600 flywheel hp area but who cares when you have a 250 shot on top of it lol. Seriously though it sounds like a stout setup

560ish

There is a thread in this section of a guy that made 550whp with livernois stage 3 243's on a 418. Martin @ Tick Performance posted the thread. I would say 600hp at the crank is realistic. It seems many have forgot since the LS3 stuff came out how capable the 243 head is when worked over by a competent porter.

https://ls1tech.com/forums/dynamomet...ast-102-a.html

Edit*

I noticed you were the 2nd post in that thread lol.

yea i been following a few threads on here with very close set ups and they all have 243 castings and they turned out very good.

my setup with ported 243's on a 408 and m6 will prollly be in the 55x range when I get back on the rollers and retune for the bigger headers and fast 102 setup so no reason any 418 with the bigger bore shouldn't be there. 550 with an m6 with say 12 % drivetrain loss is around 625 fwhp. as long as the heads flow a real 300 + cfm and everything matches and no restrictions.

Looking at your combo there is no reason why that combination would not hit your goals. Use our Pro Series 416's at 11.0:1 and you can run it on pump fuel.
Set up a gallon cell(C-16 in it) and separate fuel system for the N2o kit.
As long as you have the proper header and tune you will be in good shape.

i will be calling you in a few days about doing the shortblock.as far as the headers im putting it in a 71 nova kooks sell a set of 1-7/8 for $1,000 i can have a custom set made for same price any size i need would a 2in header be to much for this build