+2
I run 28 degrees total timing on my 455. It runs equally as well at 30 degrees and I see no improvement going any higher. It starts to slow up slightly at 26 degrees, so I've been leaving it at 28 degrees total now for over 10 years, pretty close to a stock advance curve (all in just past 3000rpm's)with a positive stop welded in (HEI). I also add a few degrees from the vacuum advance (ported vacuum). Drives nicely and no detonation ever, even the few times I've ran 87-89 in it........
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
|