Quote:
Originally posted by 392cobra
Nick,
I have a 383 sbc in a '68 Nova,so it is certainly heavier than our Cobras.
The total advance sounds good.Can you shorten up the cent. so you can get more initial ?
If you could get the cent. in faster,like 3000,you might be better off.
I'd lose the vacuum advance all together.
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Cool a fellow Nova owner too! Mine - 1970 Pro-street 468 BBC 600hp all throttle.
I agree that with his weight of car (Cobra) that he could bring in the centrifugal advance faster, but he's off to a lot better start.
I disagree, however, on the vacuum advance. In Drag Racing, Vac advance means absolutely nothing because you spend =0= (zero) time at part throttle operation. In Roadrace and any track car, we spend a considerable amount of time nursing a car through a corner or coming off of corners well out of our desired power band and the vacuum advance helps with that considerably.
Yes, if the vacuum advance brings the timing up to 60* that's fine because as soon as you put any load on the engine, the vacuum signal drops and the timing will retard to keep you out of detonation.