Here are the factory 1970 383 cam specs:
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The "Roadrunner Cam"
383/330 horsepower
Would be interesting to see the cam specs on the 2 cams they are swapping back and forth on Nick's Dyno tests, to see how they compare to the factory grind numbers?
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I had an original 1967 383 4 barrel engine that factory rated out at:
10:1 cr, 325 horsepower, 516 closed chamber heads. Factory cast iron 4 bbl intake manifold. Split grind factory cam, with more lift and duration on the exhaust to work with the smaller 516 exhaust valves. Flat top factory pistons.
We put in new exhaust seats and new valves springs. The new valves stood up nice on the new valve job with the new hardened exhaust seats.
Kept the factory cam, lifters and rocker assembly.
1967 383 4 bbl. cam specs:
View attachment 1716258443
View attachment 1716258445
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