Glad I was able to score a factory set of the valve relieve std bore 318 9.1 pistons off Craigslist here for my next build. So I am good for one build, wish someone made new duplicate pistons to match them.
Get out out a caliper and check the piston height from top of the pin bore to the top of the piston crown. Add 0.492", or post the measurement here, to see what you actually have for sure for CH.
