JimW and Tom,
I am also setting up a Holley 390, List 6390, a 4150 used on International Harvester's 392 v8. Hmmm. Anyway, Stock jetting is 50 pri, 51 sec, I am running slightly richer at 52 pri, 52 sec. PVCR's are .028" pri and .031" sec as I measured them. Currently, this carb and jetting are winning the carb shootout I am doing.
Tom, if you have a 6299 apart, can you use a wire or something and measure the PVCR? Also, the 6299 is said to have an "inverse power valve which closes when vacuum is low" (Urich and Fisher, "Holley Carburetors" 1972, pg52). I could never figure this out. Does your 6299 have this? Otherwise, I can't see where the 6299 is any different from any other Holley. I've heard of reverse IDLE but never seen a reverse Power Valve.
JimW, ditto, can you try to measure the PVCR in that 8007 next time it is apart? Des Hammill's book pg 22 says PVCR .038" but that sounds too big, maybe. Also, you said the metering plate is #31,I can't find that plate #, but the Holley charts I have for 8007 show either plate #34 or plate #59, both of them with .052" secondary main holes. If yours is a #31 plate, what size are the holes (in the bottom)?
Agree with Tom, maybe we can sort out more on the 390 Holley here.
As a side note, the first 390 Holley was also the first 4150 Holley, used on the 1957 Ford 312/245hp, List 1272-1273. I actually drove an original in the original car back around the mid-70s.
