GM V8 Block IDs for your swap

Years 88 to 98 numbers

You can use these ID numbers to find the right block to work with the same year as you truck or blazer...
C= 2 wheel drive and K = 4 wheel drive... 15 = 1/2 ton 25 = 3/4 ton...

5.0L 305 CID Vin code H V8

1988 C15 K15 C25 K25
PNH, PNL, PNM

1989 C15 K15 C25 K25
TWA, TWB

1990 C15 K15 C25 K25
ULC, ULD

1991 C15 K15 C25 K25
FCA, UYA

1992 C15 K15 C25 K25
TBA, TJA

1993 C15 K15 C25 K25
UDA, UDB, UDD

1994 C15 K15 C25 K25
FKB, FKC, FKA

1995 C15 K15 C25 K25
PAA, PAC

5.0L 305 CID Vin code M V8

1996 C15 K15 C25
XNA, XNC

1997 C15 K15 C25
FHB, FHC

1998 C15 K15 C25
PAB, PJK

5.7L 350 CID Vin code K V8

1988 C15 K15 C25 K25
D7T, D7U, D7W, D7X, PJC, PJF, PJJ, PJL

1989 C15 K15 C25 K25
TPA, TPC, TPD, TPF, U4A, U4B, U4C, U4D

1990 C15 K15 C25 K25
UPK, UPL, UPM, UPN, U7H, U7J, U7K, U7N

1991 C15 K15 C25 K25
FJA, FJB, FJU, FJZ, FND, UZA, UZB, UZN, U8B, U8C, U8P

1992 C15 K15 C25 K25
TDK, TFA, TFB, TFC, TFD, TFF, TKA, TKB, TKD, TKF, TND, TNF, TPA

1993 C15 K15 C25 K25
UKA, UKB, UKC, UKD, UKF, UKH, UKJ, UKK, UKL, UKN, UKP, UMA, UMB, UMC, UMF

1994 C15 K15 C25 K25
FSD, FSH, FSL, FSS, FST, FTC, FTK, FTL, FTN, FSB, FSJ, FSN, FSP, FSA, FSC, FSK,

1995 C15 K15 C25 K25
PHA, PHB, PHD, PJB, PHF, PJA, PNC, PJF, PKA, PKB, PKC

5.7L 350 CID Vin code R V8

1996 C15 K15 C25 K25
XJA, XKB, XJF, XKH, XKL, XKP, XKS, XKT, XKU

1997 C15 K15 C25 K25
FKA, FKB, FKF, FLA, FLD, FMA, FMB, FMC, FMD, FJA, FJB

1998 C15 K15 C25 K25
PCA, PCB, PCF, PCH, PDC, PDF, PPA, PPB, PPC, PHX, PJN, PJP

7.4L 454 CID Vin code N V8

1990 C15
FCH, FCJ, FCK, FCL, FCN

1991 C15
PCH, PCJ, PCK, PCL, PCN, PSC, PCT, PDH, PDJ, PDK, PDL

1992 C15 C25 K25
TCH, TCJ, TCK, TCL, TCN, TCS, TCT, TDH, TDG, TDK, TDL

1993 C15 C25 K25
UCH, UCJ, UCK, UCL, UCN, UCS, UCT, UDH, UDJ, UDK, UDL

1994 C15 C25 K25
FCH, FCJ, FCS, FCT, FDH, FDJ, FCK, FCL, FDK, FDL

1995 C15 C25 K25
PCH, PCL, PCK, PCJ, PCS, PCT, PDH, PHJ, PDK, PDL, PDJ

7.4L 454 CID Vin code J V8

1996 C25 K25
XCH, XCL, XCK, XCJ, XCS, XCT, XDM, XDJ

1997 C25 K25
FCH, FCJ, FCK, FCL, FCS, FCT, FDH, FDJ, FDK, FDL, FCY, FDY, FCX, FDX

1998 C25 K25
PCN, PCJ, PCK, PCY, PCS, PDH, PCL, PDK, PDJ, PDY, PDL

Writeup by Jeff Henderson
Info found from LMC, Chiltons, and a few different places on the net...

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Last Modified: 7-13-05 JCH