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i bought a motor block casting is 3932388 gm id says its a 350 from 1969 the suffix code on the front of the lower head says
T0221HV 1964 T=towanda 02=feb 21= day HV= 327 350hp 4 bbl vette motor so do i pick weather i want a 69 350 or a 64 327? please help?
I would go by the casting number. To help verify, check the crank, I suspect you will find it's large journal (the 64 would have a small journal).
The letters on the pad at the front of the block (HV) do not match the numbers off the bellhousing (3932388). Check both very carefully. Use a wire brush to brush the letters and numbers to be sure what they are. If you're absolutely certain that they are as you posted, then like Mike said, go by the casting number on the bellhousing. Go with caution before you use the block for a project. It may be a '69 302 block that could fetch good money from someone wanting to restore a Z-28.
The HV code fits two installations:
1965 Corvette 350hp 327 with theRPO L79 and a 4 speed single 4bbl Holey carb
1969 Impala 255hp 350 with a turbo 350 tranny RPO LM-1 single 4bbl
The block casting 3932388 says it is a 1968-1979 350 with EITHER 2 bolt mains OR 4bolt mains