I managed to find two Goodwrench 292 engines for my 1951 Chevy 3800 pickup; my rationale being that I should be able to make one good one out of the two. Both need to be rebuilt. My question regards identification. Both are Mexican-built, block castings 93411147 and head castings 93413990. Both show GM 4.8L G on the pad behind the starter, with no casting date codes that correspond with any format I have been able to find. Above the GM 4.8L G casting is 151, with 96 further to the right on one, and 261 and 98 further to the right on the other. The stamped I.D. on the 151 block (on the distributor boss) is M07056SV, which to me indicates a build date of July 5, 1996. The other is stamped 2M09239SV, built Sept 23, 1999. Both heads have casting "96" and "98" respectively. Given that the 292 was discontinued in about 1989 in vehicles, but it is my understanding that the Goodwrench replacement engines were still available until 2000 or 2001, is my theory that these blocks were cast in May 31,1996 (Julian date 96151) and Sept 18,1998 (Julian date 98261) at all feasible? The build dates seem to be possible if we accept the casting dates as possible. Any former dealers/parts gurus out there that may have reliable input into this question? Also, any good info on the "SV" suffix on both engines? Does it just designate a Goodwrench replacement engine? Sorry for the extended rant, but reliable info on these engines, particularly on the later "M" versions, seems to be very scarce on the net. Thanks for reading all this, and thanks for any and all responses. I have pictures if anyone wants further verification, not sure how to post here, PM me at packhousemike@gmail.com