Is it worth porting a stock LS3 intake?
Does anything stand out on the dyno graph? I am concerned with the torque falling off at 5500 and peak power at 6000. Do I have a restriction on the intake side or is this a valve spring issue or no issue at all?
I have seen LS3 CNC heads from GM for a reasonable price. Any thoughts?
My relevant mods are:
new long block consisting of a LS2 stock bottom
new LS3 0821 heads milled .025, springs upgraded, stock GM head gasket
stock LS3 intake
Ported Stock Throttle body
Stock LS2 Injectors
Cam (236/240 590/590 112 lsa)
Kooks long tube, catless Flowmaster
by Jeff M
, on Flickr[/IMG]
a few pony's are hidden in the intake porting.
It's not going to be a huge gain but yes some power is to be had.
Easiest way to see if you have a restriction on the intake side is to use a good old vacuum gauge. If you have vacuum at wot something is restricting you. Cold air; throttle body or intake.
If it pulled smooth and didn't break up I doubt you have a spring issue.
If you cnc the heads it will not fall off a bunch on the torque and it will make a few more pony's up top as long as you use a quality port like we offer.
you would send your castings for us to port vs buying a set outright would be a ton friendlier on the budget.
unless you are going forced induction, more cubes or a more radical camshaft it may not be a benefit for you.
Your car seems to be on par power wise for the mods you have.
remember combo combo combo