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Old 04-21-2013, 06:26 PM   #1
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Roller Rockers

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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Old 04-21-2013, 06:37 PM   #2
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The only thing I would look at is piston to valve clearance. If you go with 1.7's just make sure you have enough valve relief. I would go with a stud mount roller rocker.
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Old 04-21-2013, 07:07 PM   #3
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Is there any work done to your GT40p heads to back up that 331 stroker
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Old 04-21-2013, 07:53 PM   #4
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yes, the heads will be reworked and be ported a little bit, but nothing crazy.
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Old 04-21-2013, 08:02 PM   #5
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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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Old 04-21-2013, 08:28 PM   #6
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Awesome thanks. Do you have a link to the rockers you are talking about? The only comp cams rockers I can find are aluminum.
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Old 04-22-2013, 06:36 AM   #7
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The GT40 heads your they pedestal mounted or stud mounted for rocker arms

---------- Post added at 05:36 AM ---------- Previous post was at 05:35 AM ----------

Quote:
Originally Posted by WhiteCobra94 View Post
The GT40 heads your they pedestal mounted or stud mounted for rocker arms
Just remember that and don't order the wrong ones !
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