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I don't run Victor head but I am surprised at the amount of timing to gain best power. These numbers reflect those of a stock style iron head. I would think that with a more modern chamber and better plug location they would need less. Has anyone besides Jim tried less during the same day? Just curious
Doug

In my car, I have Indy 440-1 heads, 13.5 CR with flat tops, 68cc, 511 CID, and this is all the ignition timing my motor needs:

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1