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We have done several 1970 and up C-10's, but the 66 seems to be different at every turn. We tride several factory manifolds, and speedway block huggers with no luck. If anyone else is building one the Sanderson CSLS1 header is the only thing that we have found to clear the factory motor mounts on this truck. Chevy Performance wires PN#12495519 fit these nicely.
01-16-2015, 10:32 AM
1966 C-10 5.3 Swap Headers 
