that has not one thing to do with it or not being a turd first off aBBC 454 is not a Fe block so what may work good on a ford may not work on a chevy for thust /end play did you set the rear main cap end play ? end play can be up to .010 any thing past that i worry abit .side clearance rods can be from 014 to 020+ .rods and mains 001.5 to 003.5