Mopar Performance Purple Mechanical Camshaft - P4120653AE Cam Card
I'm thinking 8 * advance in at 104?
That's a wrong thought.lol.
If the cam is ground with 4* advance already in it and all things are perfect, then it will come in 4* advanced. If you add 4* to that, that would indeed get you 8* advance; but I don't know anybody that would do that on purpose, especially not with a 468 cuber.
Here is that cam in the way that I write cams;
279/279/112.
the maximum overlap is (279 +279)/2, less (112 x2) =55*
at split overlap, the Ica would be;
55/2 plus 360, less 279, less 180, and sign change =71.5. Now I can calculate the rest of your numbers, and I get;
279/108.5/108.5/279/55 with an Ica of 71.5
intake/compression/power/exhaust/Effective overlap.
With 468 cubes, in a streeter; Split overlap is as good a place as any, to start.
But with just 8.5/1 Scr, I'd be leaning towards at least 2* advance; which trades away 2* from power extraction to compression but loses double that in Effective overlap, so the new numbers are;
279/110.5/106.5/279/51
> 106.5 is still plenty of extraction.
>The plus 2* of compression might only make 4psi at most, tho.
>If you have log manifolds, then Effective overlap means as good as nothing.
