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Yikes, yet ANOTHER set of .050 durations for that same Magnum "268-284" cam.
So now I've seen
228-241 (seems big, but no bigger than the Olds W30 or Ford 429cj)
213-225 (about like the Pontiac RA1-RA3)
208-221 (that's kinda small for a 1.50 Rocker arm)
The plot thickens.
If the six pack was a...
Hi, I am new here and searching for engine data.
Most of the places I see say that the stock cam for:
383/335 Magnum
440/375 Magnum
440/390 6v
was all the same cam, 1967-1971, manual or automatic.
Most places I see give the duration at .050 lobe as
228-241
Lift .450 .458
Is that...
Been wrenching for 50+ years. Have owned & worked on Ford, Chevy, Mopar, and even a few British cars. Wrote the "Gonkulator" (named by others!) for dyno & dragstrip predictions. Now researching engine stuff, details like cylinder head flow, cam events at .050, etc.
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