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Compression ratio really depends on the entire combination.
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The new 500 stroker is 12.4:1 compression, and I have been running it on 100 octane pump unleaded. I have not tried it on lower octane.
What gas station carries "pump" 100 octane gasoline? That sounds like a Sunoco race fuel, unleaded so it is street legal. But I have often seen that more expensive than 110 leaded race gas.
Is this engine with the same Brodix B1 B/S aluminum heads?
My street 440 with iron heads is 10.7 CR and runs on pump 93 octane with the MP 0.557" cam. So aluminum heads might allow up to 1.0 CR higher.
With aluminum heads and 500+ CID, I wouldn't put less than 260 degrees at 0.050" and 11.0 CR. But that is just me.
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