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You're looking for pedestal mount roller rockers. Crane Cobra's are relatively cheap, but they will increase the ratio from 1.6 to 1.7, which depending on your cam can be a good thing, or a bad thing. I used a set of those for 10+ years with the factory pistons, factory cam, factory heads, and then later with TF TW heads and a 2031 Crane cam.
89 Coupe, 369 big bore, AFR, custom Comp cam, Kooks, 3" exhaust, 11.6 @ 121 mph
04 Cobra, JLT 12" CAI, Magnaflow, Borla, Stifflers, FTBR Rr Susp, MM Frt Susp, 12.4 @ 115 mph
67 Cougar, XR7 GT, 462 FE, 4 spd, Edelbrock heads, PI intake, Global West
OK UPDATE, mystery cam is a compucam 2040. whereas I have read that its pretty much the same as a e303. can I use 1.7 rockers and not have clearance issues?
would I continue to use the pushrods that are in it now?
one other question is interference...If my motor where to jump time could my valves hit my pistons? is this a "non interference motor"
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