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Message: [QUOTE="Big Bore Stroker, post: 1229560, member: 70619"] Worn pipe springs and worn out crush washer between the pipe and the cylinder will cause a rattle sound and in some cases goes away with engine speed (off idle). New springs, 0-rings for pipe with high temp rtv silicone, new copper crush washer. The copper crush washer keeps the steel pipe from beating against almun clyinder. But like the other guy said hard to determine here on the computer. good luck. [/QUOTE]