Slant Six Exhaust Mannyfold
RRR, they are out there. This mic'd at 1 15/16 if not a flat 2.00. Its an early 60s model casting without ribs. Casting number 2121676 ( may be a '59 designed for '60 casting as "21" is a 1959 prefix for lots of '59-'60 designed parts) in pic. It would take you about 5 minutes with a round file to get this to a clean 2.00. They added ribs in the later castings to combat cracking. IIRC a 16th difference in diameter is .993% smaller than a 2.00 so maybe searching for a 2.00 over a 1 15/16 is a moot point, with plenty of meat to wallow out another 1/8 inch at a 16th a side.
PS>>> 76-78 3671862 casting are supposed to have 2-3/16 ports!
RRR, they are out there. This mic'd at 1 15/16 if not a flat 2.00. Its an early 60s model casting without ribs. Casting number 2121676 ( may be a '59 designed for '60 casting as "21" is a 1959 prefix for lots of '59-'60 designed parts) in pic. It would take you about 5 minutes with a round file to get this to a clean 2.00. They added ribs in the later castings to combat cracking. IIRC a 16th difference in diameter is .993% smaller than a 2.00 so maybe searching for a 2.00 over a 1 15/16 is a moot point, with plenty of meat to wallow out another 1/8 inch at a 16th a side.
PS>>> 76-78 3671862 casting are supposed to have 2-3/16 ports!
