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Guys do the Steam Pipe crossover bolt seals on the back of the heads go against the block side of the crossover pipe or between the crossover pipe and the bolt?
 

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between pipe and head
 

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I always put one on each side of the crossover pipe and never had a leak.
 

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You're right had to check parts manual and it takes 4 per car.
PN 10108689
 

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If you can't find the GM ones or are put off by the price of them, you can just go to your local auto parts store or maybe even a hardware store and get the steel washer with rubber insert washers with a 1/2" hole in them are suitable replacements. Be sure to torque the crossover pipe banjo bolts to 30 ftlbs. - Peter
 
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