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Re: Please help decode my motor
GM Engine decoding list...hope this helps anyone else out
Engine Block Casting Numbers
Notes (for below): "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in. "Main Caps" is the number of bolts holding the cap. A "two-bolt" main, or a four-bolt main. Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. However, a properly prepared 2 bolt main engine will work just fine (often times you'll lose a rod bolt before you break a crank because it's "only" a 2 bolt main).
Years Casting CID Low Power High Power Main Caps Comments
1980-85 140029 350 - - 2 car
1973-80 330817 400 150 180 2 car, truck
1975 355909 262 110 110 2 car, truck
1976-85 355909 305 - - 2 A
1975 360851 262 - - 2 Monza
1976-79 361979 305 - - 2 car, truck
1978-86 366245 350 - - - car
1982-86 366286 350 - - 4 Chevrolet, siamese
1982 366299 350 - - 4 Chevrolet, aluminium
1956-67 383810 283 - - 2 -
1967-68 389257 302 - - 2 Z-28
1968-73 391436 307 - - 2 -
1965-67 393288 283 - - 2 car, truck
1976-79 460776 305 - - 2 car, truck
1976-79 460777 305 - - 2 car
1978-79 460778 305 - - 2 car, truck
1979-82 471511 267 - - 2 car, truck
1976-85 581671 305 - - 2 A
1985-94 1489363 350 - - 2 -
1979-82 2135412 267 - - 2 -
1979-82 2404929 267 - - 2
1973-76 3030817 400 - - 2 car, truck
1958-61 3556519 283 - - 2 car, truck
1955 3703524 265 195 _ 2 car, no filter
1955-56 3720991 265 195 225 2 car, truck
1957 3731548 283 220 283 2 -
1956-67 3736935 283 - - 2 -
1957-59 3737739 283 220 290 2 car, truck
1958-62 3756519 283 170 315 2 car, truck
1956-67 3756935 283 - - 2 -
1962-65 3782870 327 250 375 2 car, truck
1956-67 3789187 283 - - 2 -
1962-67 3789817 327 210 275 2 car, truck
1961-62 3789935 283 170 315 2 Late 61 car & vette
1962-67 3790721 283 170 220 2 Chevy II
1964-67 3791362 327 250 300 2 Replaced 3790721
1958-63 3794226 283 170 195 2 Car & truck
1968-69 3794460 327 250 250 2 truck
1968-69 3814660 327 - - 2 F A
1968-69 3814660 302 - - 4 Camaro, Z-28
1963 3830944 327 - 300 2 -
1956-67 3832338 283 - - 2 -
1964-66 3834810 283 195 220 2 Car, truck & marine
1962-63 3834812 283 170 195 2 car & truck
1958-62 3837739 283 - - 2 -
1964-68 3849852 283 195 220 2 car & truck
1956-67 3849859 283 - - 2 -
1956-67 3849935 283 - - 2 -
1964-67 3852174 327 - - 2 car, truck
1968-76 3855961 350 - - 2 car
1964-67 3858174 327 275 350 2 Full, A & Y
1964-67 3858180 327 250 300 2 -
1962-67 3858190 327 - - 2 -
1965-67 3862194 283 195 220 2 Chevy II
1962-66 3864812 283 230 - 2 car, truck
1964-67 3868657 327 300 - 2
1962-67 3876132 327 - - 2
1963 3889935 283 - - 2 truck
1967 3892657 302 290 290 2 Z-28, small journal
1967 3892657 327 210 350 2 car & truck
1967 3892657 350 295 295 2 Camaro
1968-69 3892659 327 210 - 2
1967 3896944 283 195 195 2 replaced by 307 in 68
1967 3896948 283 195 195 2 identical to 3834810
1967 3903352 327 210 350 2 cars only
1969-80 3911460 350 - - 2 A
1968-73 3914635 307 - - 2 car
1968 3914636 307 200 200 2 car & truck
1968-69 3914638 327 - - 2
1968-73 3914653 307 - - 2 A
1968 3914660 327 210 300 2 cars
1968 3914678 302 290 290 2/4 Camaro, Z-28
1968 3914678 327 210 350 2 car & truck
1968 3914678 350 295 295 2 Camaro/ChevyII
1965-67 3932288 283 - - 2 A
1956-67 3932338 283 - - 2
1974-75 3932368 350 - - 2
1969-73 3932371 307 - - 2 car,truck
1969-73 3932373 307 - - 2 car,truck
1969 3932386 302 290 290 4 Camaro Z28
1969 3932386 327 210 210 2 Camaro
1969 3932386 350 300 350 4 LT1
1969 3932388 302 290 290 4 Z28
1969 3932388 350 300 300 4 cars
1968-69 3933100 327 - - 2
1968-69 3933180 327 - - 2
1968 3941174 307 - - 2 truck
1956-67 3949852 283 - - 2
1970-80 3951509 400 150 265 2/4 car,truck
1970-73 3951511 400 255 265 4 B & G body
1962-67 3953512 327 - - 2
1968-69 3955618 327 - - 4 A,F,Vette
1969 3956618 302 290 290 4 Z28
1969 3956618 327 235 235 2 fullsize
1969 3956618 350 250 350 2/4 cars
1969 3956632 307 200 200 2 car & truck
1969-76 3958618 350 - - 2 A
1962-63 3959512 327 250 - 2
1956-67 3959532 283 - - 2
1968 3970010 327 - - 2 A
1969-79 3970010 350 185 370 2 or 4 car, truck, Vette
1970-73 3970014 350 200 300 2/4 LA built Camaro
1969-73 3970020 307 115 200 2 car,truck
1969-72 3970024 307 130 200 2 A,F,X
1968-76 6259425 350 - - - car,truck
1980-84 14010201 305 - - 2 car,truck
1980-84 14010202 305 - - 2 car,truck
1980-84 14010203 305 - - 2 car, truck
1980-82 14010205 267 - - 2 -
1980-85 14010207 350 - - 4 truck
1980-85 14010209 350 - - 4 truck
1978-86 14010231 305 - - 2 -
1979-82 14010280 267 - - 2 car
1982 14011064 350 - - 4 Chevrolet, high tin
1979-82 14016375 267 - - 2 -
1979-82 14016376 267 - - 2 car
1978-85 14016379 350 - - - car, truck
1980-84 14016381 305 - - 2 car, truck
1978-88 14016383 305 - - 2 -
1979-82 14040205 267 - - 2 -
1978-86 14049047 305 - - 2
1986-94 14079287 350 - - -
1987 14088526 350 - - 2 Camaro
1986-94 14088548 350 - - - -
1986-92 14088551 305 - - 2 -
1988-94 14093627 305 - - 2 -
1986-94 14093638 350 - - -
1988-94 14094766 305 - - 2
1986-94 14101148 350 - - -
1987-88 14102058 305 - - 2
1969-85 14316379 350 - - 2
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