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You’re absolutely correct on the RPO code designations. In fact, when GM moved to alphanumeric RPO coding in 1963 it assigned M20 for its...
Thanks! I've been trying to find a specific point during the 1973 calendar year that GM ceased its 4-speed for M20 and M21 applications (we know...
Would you happen to have a copy of that letter?
It looks to me like it's a typical HEI. Typically, there aren't any rubber seals or sealed bearings in an HEI unless it's been redesigned by a...
Can anyone shed light on why, for 1971, the 3.42 axle used a 3R-type universal joint while all other ratios (2.73, 3.08, 3.73, and 4.10) used the...
I've read on several Camaro reference sites that the 1971 Z-28 package is said to have included heavy-duty u-joints. Has this ever been proven in...
