Dyno Graph should I port LS3 intake or waste of time - ModernCamaro.com - 5th Generation Camaro Enthusiasts
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post #1 of 2 Old 09-21-2015, 12:00 PM Thread Starter
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Location: Jacksonville, FL
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Dyno Graph should I port LS3 intake or waste of time

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
Xair OTRCAI
Stock LS2 Injectors
Cam (236/240 590/590 112 lsa)
Kooks long tube, catless Flowmaster
M6

[IMG]Dyno 8-6-14 by Jeff M, on Flickr[/IMG]

2006, M6, LS2 Bottom, L92 Heads, 236/240 Cam, LS3 Intake, Ported Throttle body, Kooks Long tube, Cat less Flowmaster, Vararam, B&M Short Shifter, Centerforce Clutch, 439 whp/397 trq
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post #2 of 2 Old 09-23-2015, 09:18 AM
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Quote:
Originally Posted by JeffGoat View Post
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
Xair OTRCAI
Stock LS2 Injectors
Cam (236/240 590/590 112 lsa)
Kooks long tube, catless Flowmaster
M6

[IMG]Dyno 8-6-14 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
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