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My sled has an issue which I believe is being caused by it running lean, it is knocking and misfiring at high rpms and has an occasional backfire, I checked the plugs and they look fine because they sled runs perfect at idle, idles smooth right in and around 1800 rpm, sled was rebuilt 400 miles ago which leads me to believe it's not a plugged carb, maybe a leaky carb boot or crank seal? Anyone have any idea?
 

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What is your squish at? What pistons did you use and which base gasket did you use and what had been in there?
 

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I think it's time u do some research. It's possible u our who ever put the wrong thickness of gasket in during the rebuild. That can cause that. Find out the thickness of the stock gasket for that pertickuler motor for that year and what was installed.

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