Pre-detonation

On 429/460 when pre-detonation happens dose it happen on all cylinders or dose firing order have anything to do with it because 7&8 fire next to each other # 7 would show Signs of pre -detonation

No it's a combination of several factors, oil contamination, sharp edges on combustion chamber surfaces, (piston and head), lean cylinder, (this can be on 7&8 because one fires after the other off the same corner of the manifold, (single plane only). Timing difference because of a reluctor tab bent in the distributor.

It goes on and on.

A good sealed up engine with a good tune and compression where it needs to be is the answer.

Thanks back in 85 no internet I was 20 and I never could get to tune right and I think the main reson was I used the dist. Out of my 79 351 and never had it set right to point that the best way I could get it to run was with no vacuum now I found out that they have different adv. plate 18 13 and so on so when I get it back together ill get a dist from Scott that's set up for my app thanks for the info

Sure, just make sure where your total timing is and what rpm it is all in by.

Yep from what I've read all in at3k

IDT-572 wrote:No it's a combination of several factors, oil contamination, sharp edges on combustion chamber surfaces, (piston and head), lean cylinder, (this can be on 7&8 because one fires after the other off the same corner of the manifold, (single plane only). Timing difference because of a reluctor tab bent in the distributor.

It goes on and on.

A good sealed up engine with a good tune and compression where it needs to be is the answer.    

a reluctant reluctor I have heard of those