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Crate Motor

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An absolute worst enemy to a 604 crate engine owner is the rule you have to run such a low pressure valve spring. With that being said its a MUST to check the valvetrain on these motors EVERY race. Always pull the valve covers off to make sure that there are no valve spring cups, valve springs, retainers, or keepers broke or damaged because these are the weak link in these motors. One quick and easy way to make sure nothing as changed drastically, is to get eye level with all the valve springs and make sure none look higher than each other when there fully closed. Routine maintenance will win you more races than anything. 


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