The SB 727 has a smaller dust shield because of the two large bolt holes at 7 and 5 o'clock for the support struts to the block. Easy enough. No reason to measure anything, though the 727 was made for the AMC V-8, too and I really don't care about those


1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction
1998 Ram 2500 QuadCab, new daily driver.
2008 Honda Element
2014 Carry-On 7x14 Cargo Trailer