lastlumina

Iam building stroked ls3 416, short block already assembled.

Now looking for the camshaft that will help me to get the power range to 550hp.

What specs should i go with, its not a daily drive car so i wanna maximum power from it.

c5 zo6

102/90 intake and tb
821 heads - will upgrade in future to PRC or TFS
Wiseco -3 pistons
Callies crank and rods

239/254 .624"/.595" 114+3
Is that will be good for my setup ?

Thx

KW Baraka

iTrader: (7)

Compression Ratio?

KW

lastlumina

CR around 11.2:1

03EBZ06

I would guess 525 rwhp/480 rwtq w/that combo, but I would also see that as a fairly streetable motor.

lastlumina

You mean with stock heads, right?

flintwrench69

iTrader: (11)

Lastlumina yours is very similar to mine, 242/256 cam here .630/.609 on a 113+4, custom cam by Martin Smallwood. CR around 11.5:1, stock Ls3 intake, & bottlenecked ypipe setup I made 485whp, 460tq on a Dynojet through a 9 inch w 4.11s. Gonna have Rick Crawford port the intake & TSP TDs should put me around 520whp, 480tq.

xdanny510x

Some where along the lines of 230/244/621/598/114 lsa give or take.

Martin Smallwood

iTrader: (2)

To hit 550rwhp you'll need at least 11.7-11.8:1 compression, that is if you have 93 octane available. You'll also need better heads than 821 castings to really guarantee the kind of numbers you're after. You might look into having Frankenstein Racing Heads or TEA port the 821's to try and maximize that castings potential on your combination.

You'll need a pretty aggressive cam to hit those numbers as well, but that will also depend on the heads and their flow curves.

Ls-x

iTrader: (3)

I am interested to see Rick Crawford porting results.

Good luck with your build

lastlumina

I hope to close 500whp with my ls3 heads

lastlumina

With stock heads 68cc CR should be 11.3 as wiseco said and 11.7 with 65cc heads (.051 gasket)

I know that can't hit 550rwhp with stock heads, going with PRC 260 mild to 65 in future.

KW Baraka

iTrader: (7)

You really don't want .051" gasket.....

KW

Martin Smallwood

iTrader: (2)

^^^ This.

Try to get a thinner .040" gasket to decrease your quench volume and you'll kill two birds with one stone. More compression and tighter quench for added N/A power.

ls1itldo

iTrader: (30)

Just give TSP a call. Im sure they can spec you a cam that would go great with their heads

MyLS1Hauls

iTrader: (2)

How can you guys specify head gasket thickness without knowing his piston to deck height?

KW Baraka

iTrader: (7)

A good honest question!

And the answer, in maybe 75% of the time is that you can't.

In that other 25% of the time, you have to look at what is 'most likely' in an engine build for a street engine using the 'common' specs of aftermarket parts. To that end:

1. In street used engines (including the LS platform), ideal quench normally in the .030" to .040" range with most aiming for the middle (.035"-ish);

2. The higher the compression, the more critical it is to reach ideal quench.

3. Most stroker rotating assemblies are gonna put the piston in the hole at TDC from .005" to zero deck. I'm sure that they must be outliers somewhere.....but I haven't seen or heard of them;

4. Taking this into consideration, the combustion chamber size expressed by the OP and the compression he sites, it's a damn good assumption that the pistons are a bit in the hole with a 3cc to 7cc valve relief. That being the case......a .051" gasket is a bad idea for an engine with 11.7:1 compression particularly when max power is sought.

5. I wouldn't state a specific gasket without knowing the where the piston is in the hole.....but I'd shoot for .035" quench.....final compression ratio be damned. Martin, IMO, sited a smarter alternative to the .051" gasket while still keeping an eye on a 'safe' CR (he can correct me if I'm wrong).

KW