Quote:
Originally Posted by ShipC1970
Why is that and how is that? So I have the original 70 block and matching heads. So hypothetically even though it’s from a ford mustang and I run it in my mustang in GT/QA or PA and say it’s a “mercury” engine I could run a 4150? Who checks this by the way? Forgive me for all the questions I’m new!
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You can run GT only if the comb is a hybrid. If the combo can legally be run in SS, you can't run GT. In my case, I am building a '64 Comet with the 289/210 combo. If I run the large Autolite Merc combo, it is a SS/MA. If I run the small Autolite Ford combo, it is a GT/QA. You can't swap between classes, the argument for this rule was that people were running GT with legal SS combos to avoid a potentially losing heads up runs.