Just built fresh,331 stroker.Got things going good in driveway.drove around block no issues.so decided to take it on maiden voyage, got around 1 mile it started making awful noise when motor got warm.thought it was the trans.shut it off let it sit started again sounded great.when it got warm started making knocking noiseand started missing.Don't think it detonation have 91 premium mixed with 100.Can anytime help.

 

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