Originally Posted by tresi
You do understand the 400 rods are shorter than any other small block? Unless you're trying to build a short rod stroker with a stock piston they are worth $190 per ton (scrap) to you. When you mill parts before a trial fitment or specialized measurement you're very likely to get an unfortunant surprise. If it came from Detroit it fits on the outside. If it came from a hotrod catalog it fits in the shipping box. And that's all you can count on before you mock it up. If you heads are already done either used them as is or plan on another valve job. You will end up bumping a valve seat if you port them. Sounds like you'll either need to find a 307 piston with a big dish or different heads anyway. Also don't order you pistons until you get the bores measure. Boring it .060 over when .020 or .030 will clean it up is just wasting a chance at another rebuild and your machinist might want to charge you more. It will offer little if performance gain.
Yeah I know they're short, but If there's no clearance issue they're staying. I plan on having someone professionally port them, if they bump em they buy em lol. Thats what it took to clean it the cylinders up, it had been sitting in a barn for a long time. Actually its not quite .060 yet, after I get the pistons, the cylinders can be honed to fit the pistons. What about my cam choice?