HEI distributor tuning problem

[Longhorn 70]

This is weird....Usually detonation INCREASES with increased engine temp. Yours seems to be going against that.

Most people install colder heat range plugs in mildly built engines is to alleviate detonation caused by increased head temperatures. I have colder plugs in the Olds engine in my truck and that has helped me get rid of ping.

I have a Skip White 6503 on the Olds. I haven't had pinging problems with it either. That distributor has performed well for me.

Could you be running too lean while cold and when it warms up all is good? Like the heat riser isn't there/working or the choke pulls off too soon?

Please post the solution to the issue when you find it.....I gotta know.