Napoleon3500

Hey guys im new to the forum. 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!

Duncan_GT

I would use whichever ratio is recommended by the manufacturer. I'm going to take a guess and say its a 1.6 ratio. Be sure to check your PtV clearance.

projectresto83

Just use some good 1.6 roller rockers..... However, you probably not gonna be happy with the setup unless those P heads have some major work done to them....

tinman

I think Comps cams was using the 1.6 ratio for the rocker arms as thats what most SBF's came with.
Like has already been posted, those heads are not what I'd use at all on the 331.