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I'm pulling the engine this winter and plan to change to 9.0:1 compression ratio. The questions I have... I've noticed that in catalogs that some of the 1500's originally had 9:1 ratios, but was the cam grind the same? If not, for Cal smog purposes I assume, where can I get one. Would it be ridiculous to think I can find a good used one? What about good used 9:1 pistons?
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1500, 7.5:1 to 9.0:1
- Thread starter maddy
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aeronca65t
Great Pumpkin
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I think they're the same for 7.5 and 9:1. Moss only lists one.
I think the Euro-twin carb cam is different.
I think the Euro-twin carb cam is different.
Somebody correct me here, but I beleive that going with 9:1 pistons doesn't actually give you 9:1 compression. It appears the cylinder head for the European cars are different and that is what gets you all the way to 9:1. I had to have my head cut (.050 I believe) to get me to 9:1 (in my 1500 Spitfire).