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Getting my heads cleaned etc. and I need new pistons currently they are 10:1 I am wanting to drop to 9:1 but I need to know what to jet the carb and what size exhaust I can run to get performance out of the engine. Heads are ported polished and have larger valves. Engine was used to race but I am looking to run 91 pump gas and have it be reliable with not stressing the 1957 engine. And ideas on I should run?


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