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specs for A and B cams 120-130 1967

uid 37336's pic
posted by  B20Paul. on  Mon Feb 8 12:05 CST 2016
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last visit: Mon Oct 20 10:54 CST 2014
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The lobe lift you give shows a cam that is in great condition. When they go bad, one or more lobes will have lost 1/3 or more of it's lift.

If you have a single SU or single downpipe exhaust, leave it alone. If you have twin SU's, a dual downpipe exhaust with 2.125 or 2.25" exhaust, you could consider a K cam, which works OK with stock springs.

D cam requires dual valvesprings and does NOT and never has worked properly with stock springs. In fact, the D cam was developed for the Rally Amazon B18B which featured a heavily modified head with dual springs for a 30% boost in power & torque.

Regrinding your cam will work great if you want to go that way because when you grind a cam to have more duration and lift, you remove metal from the base circle to get there except you have to keep the stock LSA which is what you want for a twin SU cam anyhow.
--
69 142S Overdrive + 69 164S Manual






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