Help with FRPP heads/Roller Rockers

[92-5.0]

I am sticking with FRPP for my combo and need help choosing the right heads and roller rockers, while trying to stay at or near the stock compression ratio. I am going to purchase the GT40X heads but don't know if I should get the 58cc or 64cc heads? Also, should I match them to the 1.6 or cobra 1.72 rollers?

 

[92-5.0]

anyone?

 

[jtfairlane]

The 64cc heads will keep you closer to your stock compression ratio than the 58cc heads, the 58cc heads will give you a slight increase in compression. If you go with the Cobra 1.7 rockers, you should be just fine with Piston to Valve clearance, but I would clay the pistons and check for sure.

 

[92-5.0]

Thanks. I'll just go with the 1.6 rr.

 

[wythors]

Check my mod list below. I went with the GT-40X303 heads for the reason listed above. The FRPP tech line recommended the 1.6 rockers for those heads with the E-cam on stock pistons. This set-up gave me 257 rwhp through the stock AOD. I'm currently collecting parts to do a T-5 swap and I'm expecting to be closer to 290 at the rear wheels when I'm done with that.

 

[85_SS_302_Coupe]

I'd opt for the 58cc heads for an NA setup...extra compression helps.