Has anyone used the 6X-4 heads on a 389 motor using 389 pistons and mild cam without having problems? And if you did, what parts did you use that were stock and what if any modifications did you make? Currently, my motor is at the engine rebuilders and waiting for my decision on heads and pistons to use. Regarding heads, I have a set of 092s and 093s to use, but want to be able to drive the car using pump gas. I will keep the heads for resale value.
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