Picked this up recently, guy said he removed it from a '48 GMC "Big Bolt" with 270 but he thought the 270 was a later one. I noticed the bellhousing bolt pattern was slightly different than a bellhousing I have from a later 1/2 ton truck 270. Also what does the -1 denote & what does the "For GMC No. 2241891" refer to? Thanks in advance.
