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Old 08-28-2014, 03:20 AM   #1
Chevy1966
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Join Date: Nov 2011
Location: San Luis Obispo, CA
Posts: 198
Exhaust manifold bolt spacing

Anyone know what the precise center-to-center bolt pattern is for a sbc gen1 exhaust manifold (square ports)? I'm CNC machining a fixture and would like to put the hole pattern right on the money. Couldn't find a blueprint anywhere but these specs must exist somewhere.
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