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Discussion Starter · #1 ·
Hey guys, I need some help figuring out what roller rockers to use. I am building a 331.I am using Gt40P heads, Trick flow Track heat intake, and a comp cams xtreme energy cam.

Cam Specs:
Basic Operating RPM Range:2,200-6,200
Intake Duration at 050 inch Lift:224
Exhaust Duration at 050 inch Lift:230
Duration at 050 inch Lift:224 int./230 exh.
Advertised Intake Duration:276
Advertised Exhaust Duration:282
Advertised Duration:276 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.544 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.544 in.
Valve Lift with Factory Rocker Arm Ratio:0.544 int./0.544 exh.
Lobe Separation (degrees):112

What ratio would be best for me? And should i stick with the pedestal mount rockers or convert to stud mount?
Thanks for the help!
 

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The cam profile your talking about is rather large, maybe too much for the GT-40 heads so 1.6's will be all you need, using 1.7's just increases the risk of your cam profile being too big.. I recommend using comp cams steel RR's as they have been good to me.
 
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