i was bored today looking up knock sensors "since i have a few of them sitting here" on autozone and i noticed something

305 tbi knock su121 pt9510
305 tpi map knock su150 pt9516
350 tpi map knock su169
350 tpi maf knock su154 pt9519
305 tpi maf knock su 121 pt9510
lt1 iron head knock su150 pt9516
lt1 alum head knock su150 pt9516
lt4 knock su121 pt9510

305 tbi tpi maf and lt4 are the same knock sensors
lt1s tpi 305 map use the same knock
i had figured they would all use differant sensors for what sounds they pick up but lt1 350s use 305 knocks
i also found this interesting it uses both tpi maf and map knocks depending on the trans
1995 Chevrolet Truck C1500 1/2ton P/U 2WD 5.7L TBI 8cyl is interesting as it uses
Part Number: SU154 same as tpi maf
Application: With manual transmission
Part Number: SU169 same as tpi map
Application: With automatic transmission