What would you guess this combo to make on the stock cam?

All the numbers are with an aftermarket cam...

It'll be on a 6 speed

Will I break 400rwhp?

Thanks in advance !

 

You've left out plenty of contributing details when asking for a generalized guesstimate.
In a nutshell, NO it will not make 400 rear wheel.
With a decent exhaust and tune perhaps 360-375 range

 

You might break 400rwhp if you do every bolt-on possible, mill the heads significantly and have an efficient drivetrain behind it.

By bolt-ons I mean fully ported intake, 1 7/8 headers no cats, good 4" MAFless intake, electric water pump, UDP etc.

A fully bolt-on LS2 with a FAST can barely squeak out 400rwhp, and you have the much better flowing heads and a pretty good intake so it's not completely out of the question.

 

A cam with 225 intake duration will put you around the 450 rwhp mark.

 

When I had my M6 05 gto(LS2) CAI,1 3/4 headers and Corsa catback with a tune my car put down 370 rwhp and at Englishtown I ran a 12.45 at 115 on a nice 70 degree day.

 

I guess I was missing out a few things like exhaust but EVERYTHING else will be stock as stated including, rockers, tb, cam etc.

I figured that the +/- with the exhaust, rockers, tb etc would be 15-25 rwhp anyways.

I'm running ls swap Dynatech 1/7/8" and dual 2.5" but good to know that it'll be in the 360-375 range.

Thank you!