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Gudmundur
 
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In article ,
says...

I have twin 350 Chevy inboards with the port standard rotation and the
starboard reverse rotation. The port has a standard timing chain while the



If the crank and cam turn backwards, the reverse cut helix causes the
distributor and oil pump to turn in the 'normal' direction. Two reverses
equal a forward, much as 3 lefts equal a right.