Big Block Suffix codes

[cheyennek20]

Hey yall, Has anyone got a book of suffix codes for 454's. I just picked up a block for $125 and the casting matches up (3999289 454 2- or 4-bolt), but the stamping I can't seem to find anywhere( T0615XCH) If anyone can help me I would greatly appreciate it

 

[4X4HIGH]

The T means truck and to my knowledge isn't listed in any of the chiltons or motor manuals but maybe mortec has a listing for it?

 

[pauly383]

That engine was born in Tonawanda on June 15 .

OK , been a while , had to check on the Chevelle board I belong to . Everyone there seems to believe XCH was an over the counter long block suffix code , they seem to agree on LS7 blocks being xch , and LS6 being xaa . Not installed in a car , just bought over the counter in a crate .

 

[k30bb468]

According to my suffix code book​

XCH = 1978 454 460HP LS-7 78-95 HO Crate Eng

OR​

XCH = 1996 454 230HP Manual trans RPO L-29​

 

[cheyennek20]

Hey, Thanks alot! No one in Cali could give me a straight answer! It definitely isn't the 1996 block.