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Big Block Suffix codes

cheyennek20

1/2 ton status
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Nov 5, 2005
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Wishing I was in Baltimore
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:doah:
 
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?
 
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 .
 
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
 
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