Quote:
Originally Posted by BAsque1
Let me ask you this; why do the specs for this engine states the 8* BTDC @ 750 rpm idle? I have literature that says that. That said I have also read that for a single 4 V carb it is 4* and for dual quads is 8*, which is it.
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Lou, here is a scan from my original 1964 Ford Shop Manual. This should be viewed as a curiosity only -- I wouldn't use it to set my tune up specs (and I don't, and I have a "kinda/almost/maybe" close to original engine build). In fact, I run the original 427-8V low riser cam in my engine (which was different than the 427-4v cam). Once the medium riser was available, the low riser 8v cam was only available as a service item. Ford's thinking was that the medium riser made up for the low riser's need for additional cam duration. If you asked the dealer to put it in for you though on your medium riser, he would, of course, do it... for a fee. Take these specs with a grain of salt. The 427-8v did not have 18" of vacuum at idle. Also, read the footnotes as to timing. Always read the footnotes... that's where you hide the truth, in plain sight.
FWIW, I run 10 degrees at idle, 25 mechanical, all in by about 2800RPM. Total of 35 degrees, with aluminum heads, stroked and bored, solid flat tappet. Very, very similar performance to the original 427-4v medium riser with the old 8v cam put in as an option. They've come along way with cams since then, but that's the way I wanted it and, as Chas. will tell you, I mostly use the car to drive to fine restaurants anyway....
