Im looking at changing my cam in my ls3 rx7. Ive been spec'd out a 236/242 .650/.650" on a 112. What do you guys think about this and do you you think ill have any ptv issues. Its a stock bottom end and stock headed ls3. Car has 1 7/8 longtubes, full 3in exhaust, and i have a ported intake/throttle body to bolt on. Any input would be greatly appreciated.

 

Every engine is different, you're gonna have to check it yourself or get a shop to do it for you.

 

There is a wide range of LS3 cams out on the market.
Some use a smaller lobe with higher lift (Texas Speed's 3 main LS3 cams) and others use a larger lobe with a high lift (LG Motorsports G6x line).

Your best bet would be to go ahead and spend the money on a Cam Guru (list what drive line you use, and how you use the car) and get a good cam for what you want/need.

I will say this though. The lift and lobe size you've been spec'd is a little on the high side for a daily driver (especially if your running an automatic).

With the LS3's lazy port head (high volume low velocity) you could end up under cutting the mid range if the cam is to large.

But the choice is up to you... Use the forums check the different companies cam listings for the ls3 heads and do what ya gotta do.

Oh and welcome to the LS1tech (if no ones mentioned it yet).

 

Thunder Racing TruTorq lvl 5 cam
Specs:
227/239 .614/.621 115 LSA

 

230/238 .600/.615.

Mine makes 517whp and goes 10.6 with a 6 speed manual

 

Any where from 224-230 on the intake and 232-239 on the exhaust. Alot will have to do with how high you spin it and where you want your power.

 

A 236 intake duration is too close to call on the ls3 with stock heads and gasket.

The G6X3 is a ~235 intake duration supposedly (they dont publish specs)...and sometimes those fit and sometimes they dont.

I would not install a 236 intake duration on your set up without checking.

 

I would check PTV for sure