Tuning For Detonation

QuickDart360 said

I have a similar issue with my hot 360. It will spark knock/detonate only after its driven for a while and in hot summer weather. Currently have rn12yc would rn9yc be a better choice? Otherwise car runs nice and crisp! Car has 3.91's out back a 9.5" FTI 3400-3600 stall converter. 292/508 mopar cam and higher compression kb107 pistons. Also 340 x heads.

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Maybe. Give me some more details. Cam specs, cranking compression number if you have it. Where is initial timing and total timing and when (RPM) does it get total timing? What intake manifold? If it's a dual plane, did you block the heat cross over?

In short, anything you can do to make the cooling system more efficient and to cool the intake charge will help a lot. Each individual step I took with mine helped. If I had to point to one step that helped the most, it was the thermostat.