Below is a list of ECM's that are supposed to interchange with a 1987 5.7L TPI Corvette. Mine has this Ident: 1227165

Three of them show the Ident: 1227165 after them
BLAZER SI0/JIMMY S15 91
BRAVADA 91
S10/S15/S0NOMA 91

I am wondering of the others use a different ID listed below? I can't imagine a 2.5L ECM working but it may. I want the same ID number if possible and wonder if it is only in those 3 vehicles.

Interchange
1987 Corvette
Controller (ECM)
Ident: 1227165
Ident: 16198445
Ident: 88999201 Located RH kick panel.

ASTRO 87-90 Elec Cont Module (ECM); (behind right kick panel), 4-151 (2.5L)
BLAZER S10/JIMMY S15 87-88 E1ec Cont Module (ECM); 4-151 (2.5L)
BLAZER SI0/JIMMY S15 91 Elec Cont Module (ECM); (6-262, 4.3L), ID 1227165
BRAVADA 91 Elec Cont Module (ECM); ID 1227165
CAMARO 86-87 E1ec Cont Module (ECM); 8-305 (5.0L), EFI
CAMARO 87-89 Elec Cont Module (ECM); 8-350 (5.7L)
CAMARO 88-89 Elec Cont Module (ECM); 8-305 (5.0L), MFI
CAVALIER 86 Elec Cont Module (ECM); 4-121 (2.0L), MT
CIMARRON 86 Elec Cont Module (ECM); 4-121 (2.0L), MT
CORVETTE 86-89 Elec Cont Module (ECM)
FIREBIRD 86-87 Elec Cont Module (ECM); 8-305 (5.0L), EFI
FIREBIRD 87-89 Elec Cont Module (ECM); 8-350 (5.7L)
FIREBIRD 88-89 Elec Cont Module (ECM); 8-305 (5.0L), MFI
FIRENZA 86 Elec Cont Module (ECM); 4-121 (2.0L), MT
SI0/SI5/S0NOMA 87-91 Elec Cont Module (ECM); 4-151 (2.5L)
S10/S15/S0NOMA 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227165
SAFARI (GMC) 87-90 Elec Cont Module (ECM); (behind right kick panel), 4-151
SKYHAWK 86 Elec Cont Module (ECM); 4-121 (2.0L), MT
SUNBIRD 86 Elec Cont Module (ECM); 4-121 (2.0L), MT


I wonder how a 2.5L ECM works in a 5.7 TPI motor. Maybe it's all in the chip.

 

I believe the ECM's are all the same and the difference is in the calibration of the chip.
Know for sure Camaro /Firebird ECM is same as Vette for '87

 

http://www.diy-efi.org/gmecm/ecm_info/