My guess is maybe you left a zero out on your readings of the cap and block. 5.012 and 5.014 and not 5.12 and 5.14 which is .020 difference and not .002. If it is .002 interference fit. I know my Source billet caps fit like any have for me after I had my studs installed and had the mains lined bored as I had no problems at all like you are having. Ron

Last edited by 383man; 04/10/16 05:21 AM.