[X-TECH MAN]

One more thing to think about. Those spring pressures I mentioned from MoPar were kind of a joke. 150 lbs seat pressure and 320 lbs open pressures. Only cars like the Max Wedge cars of the 62-64 era came close. In 1971 Chrysler Corp. sent in unrealistic spring pressures along with cam spec's that if built the engine would not even run. That way their factory cars would never be tossed out during tear down. Look them up yourself if you have the old tech specs. Cars like Dave Boertmans 71 Dodge wagon and his 71Charger could never be DQ'ed at tear down as long as the cam lift was under. Also it was legal to have real racing pistons such as the "Forge True" brand with valve reliefs on the 383 and 440 combos back in 1971. Valve reliefs meant more usable duration even though the OEM pison was a flat top with no vlave reliefs. Just food for thought.