I'd like for us to have all GM'*
Here'* one to ponder.

Engine Block Codes (ALL)
Casting Years CID HP Main Notes 140029 1980-84 350
2
330817 1970-80 400 150-180 2
355909 1975 262
2
355909 1976-79 305
2
360851 1975-76 262
2 Monza V-8 361979 1978-79 305
2
366245 1978-82 350 N\A 4 Bowtie High Tin 366286


4 Bowtie, Aluminum, siamesed, straight nodular iron main caps, 2-piece seal, 4.00-4.150" bores, 2.45" main journals 366287


4 Bowtie, Aluminum, siamesed, straight nodular iron main caps, 2-piece seal, 4.00-4.150" bores, 2.45" main journals 366299


4 Bowtie, Aluminum, nodular iron splayed caps, wet sump, 4.00" bore 376450 1978 350 175-220 4 corvette uncertain 393288 1965-67 283
2
460703 1978 350 175-220 4 corvette uncertain 460776 1978-79 305
2
460777 1978-79 305
2
460778 1978-79 305
2
471511 1979-82 267
2
3556519 1958-62 283
2
3703524 1955 265 195 2 No oil filter corvette 3720991 1956-57 265 210-240 2 corvette 3731548 1957 283 220-283 2 No side motor mounts, corvette 3731548 1957 265
2 No side motor mounts 3737739 1957-64 283 170-290 2 220-290hp Corvette'* 3756519 1958-62 283 170-315 2 passenger, corvette 3782870 1962-67 327 250-375 2 passenger, chevelle, corvette 3789817 1958-68 283
2
3789817 1962-67 327
2 truck 3789935 1961-66 283 only 170-315 2 passenger, corvette 3790721 1962-65 283 170-220 2 Chevy II recessed oil filter boss 3790721 1965-66 327 250-350 2 Chevy II recessed oil filter boss 3791362 1962-67 327 250-350 2 Chevy II recessed oil filter boss 3792563 1965 327
2
3792582 1964-65 283
2
3794226 1958-63 283 170-195 2 passenger 3794460 1962-64 327
2
3814660 1968-69 327
2
3830944 1963 327
2
3834810 1964-66 283 195-200 2 passenger, chevelle, truck 3834812 1962-63 283 170-195 2 passenger, commercial trucks 3837739 1958-62 283
2
3849852 1957-66 283 multiple 2 truck, passenger, chevelle 3849935 1965-67 283
2
3858174 1964-67 327 275-350 2 passenger, chevelle, corvette, trucks 3858180 1964-67 327 250-375 2 passenger, chevelle, corvette 3858618 1968-76 350
2 unverified 3862194 1965-67 283 195-220 2 Chevy II recessed oil filter boss 3862812 1962-64 283
2 unverified 3892657 1967 350 295 2 Camaro 3892657 1966-67 327 210-350 2 Passenger/Chevelle/Corvette/Camaro 3892657 1967 302 290 2 Z28 Camaro 3896944 1967 283 195 2 Passenger/Chevelle 3896948 1966-67 283
2
3903352 1967 327 210-350 2 Passenger/Chevelle/Corvette/Camaro 3914636 1968 307 200 2 Truck/Passenger/Chevelle/Chevy II 3914653 1968-73 307
2 unverified 3914660 1968 327 210-300 2 Passenger/Chevelle/Chevy II/Camaro/Corvette 3914678 1968 302 290 2 Z-28 Camaro 3914678 1968 327 210-350 2 Passenger/Chevelle/Chevy II/Camaro/Corvette 3914678 1968 350 295 2 Chevy II/Camaro 3932338 1962-67 283
2
3932371 1969-73 307
2
3932373 1968-73 307
2
3932386 1969 350 300/350 4 Passenger/Chevelle/Chevey II/Corvette/Camaro 3932386 1969 302 290 4 Z-28 Camaro 3932386 1969 327
2 ?? Unverified 3932388 1969 350 Various 2/4 Passenger/Camaro Rare?-NO! See FAQ on site 3932388 1969 302 290 4 Z-28 Camaro Rare?-NO! See FAQ on site 3951509 1970-80 400 only 150-265 2/4
3951511 1970-80 400 255/265 2/4 Some replacement blocks had 2-bolt main caps 3956618 1969 302 290 4 Z-28 Camaro 3956618 1968-69 327 235 2 Passenger 3956618 1969 350 250-350 2/4 Passenger/Chevelle/Chevy II/Corvette/Camaro 3956632 1969 307 200 2 Truck/Chevelle/Chevy II/Camaro 3959512 1962-67 327
2 Was also used for some replacement blocks 3970010 1970-80 350 145-350 2/4 Truck/Passenger/Chevelle/Chevy II/Corvette/Camaro 3970010 1969 302 290 4 Z-28 Camaro 3970010 1969-69 350 255-350 4 Truck/Passenger/Chevelle/Chevy II/Corvette/Camaro 3970014 1970-75 350
2/4
3970014 1968-79 350 only 200 & 255 2/4
3970020 1970-73 307
2
3970024 1969-73 307
2
4715111 1980 305
2
6259425 1969-76 350
2
10036033
350
4 Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10046164 1986 305


10051182


2/4 Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal 10051184 1986-up 350
4 Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear seal 10051184 1986-up 350 N/A 4 1 piece rear main seal. BOWTIE 10054727 1986-up 350
2/4 one piece rear seal, some "Made in Canada" 10066036
350
2/4 Target Master/Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10066038 1994 350
4 Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10090511 1990 350 375 2 LT-5, ZR1 Vette, 375hp 10125327 1996-96 350 300 & up 2/4 Gen.II LT-4, reverse flow cooling 10125327 1992-96 350 300 & up 2/4 Gen.II LT-1, reverse flow cooling 10134996


4 Bowtie, Aluminum, 4.125" bore 2.65" main journals 10153558 1991-92 350 375 4 LT-5, ZR1 Vette, 375hp 10168588 1994-96 265
2 L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling 10199001 1993-95 350
4 LT-5, ZR1 Vette, 405hp 10243878 1996-97 305
2 Vortec truck, roller cam, one-piece rear seal 10243880 1995-00 350
2/4 Gen.I crate motors and "ZZ4", roller cam, one piece rear seal 12550592 1997-99 346 345
crossbolted block, Gen.III, "LS1" 12559378 1998-00 346 345
crossbolted block, Gen.III, "LS1" 12559846 1998-99 346 345
crossbolted block, Gen.III, "LS1" 12560621 1998-98 346 345
crossbolted block, Gen.III, "LS1" 12560626 1998-00 346 345
crossbolted block, Gen.III, "LS1" 12561168 2001-04 346 350-405
crossbolted block, Gen.III, "LS1/LS6" 12562174 1998-98 346 345
crossbolted block, Gen.III, "LS1" 12568952 2005 364 400
"LS2" 14010201 1980-85 305
2
14010202 1980-85 305
2
14010203 1980-85 305
2
14010207 1980-85 350 190 & up 2/4 corvette 14010209 1980-85 350
4
14010280 1979-82 267
2
14011064 1982-86 350 N\A 4 High Tin 14011148 1987-89 350

Roller cam, one-piece rear seal 14016376 1979-82 267
2
14016379 1977-79 350 up to 225 2/4 corvette and others 14016381 1980-84 305
2
14016382 1979-84 305
2
14016383 1980-85 305
2 Truck 14079287 1986-90 350

Truck 14088526 1987-89 350

Roller cam, one-piece rear seal 14088548 1986-88 350 205 & up 2/4 corvette and others 14088551 1986-87 305
2 one-piece rear main seal 14093627 1987-91 305
2 Roller cam, one-piece rear seal 14093638 1987-95 350
2/4 Roller or flat tappet cam one-piece rear seal 14094766 1986-up 305
2 One-piece rear seal 14101148 1987-90 350
4 One-piece rear seal 14101148 1988-up 350 205 & up 2/4 1 piece rear main seal. Late model roller non LT1 14102058 1987-91 305
2 Roller cam, one-piece rear seal 14316379




22551656


4 Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck