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Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. 283 blocks (3.875" bore, 2.3" main), 302/327/350 blocks (4" bore, 2.3" or 2.45" mains), and 400 blocks (4.126", 2.65" mains). In 1968 the main bearing saddles were increased in size from 2.3" to 2.45". CID Year 262 1975 267 1979 ­ 81 305 1976 - 96 307 1968 - 73 327 1968-69 350 1968-88 265 1994 302 1968-69 350 1968-96 400 1970-72 400 1973-80 Bore 3.671 3.500 3.736 3.875 4.001 4.001 4.001 4.001 4.001 4.126 4.126 Main Cap 2 bolt ONLY 2 bolt ONLY 2 bolt ONLY 2 bolt ONLY 2 bolt 2 bolt 2 bolt 4 bolt 4 bolt 4 bolt 2 bolt

(2.3" main) (2.3" main) (2.45" main) (2.45" main) (2.45" main) (2.65" main) (2.65" main)

Engine ID Code Example: V0101CLJ - (V = Plant, 01 = Month, 01 = Day, CLJ = Engine Suffix Code) Another example: T0830CTY - (T = Tonawanda, 08 = August, 30 = 30th day, CTY = 1970 396 Camaro, 375 hp, 11.0:1, TH400) Code Engine Plant Code Engine Plant F Flint (Motor) S Saginaw Service H Hydramatic T Tonawanda K St. Catherines, Ontario V Flint (Engine) (McKinnon Industries Canada) M GM of Mexico 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 1980-85 1973-80 1975 1976-85 1975 1976-79 1978-86 1982-86 1982 Casting 140029 330817 355909 355909 360851 361979 366245 366286 366299 CID 350 400 262 305 262 305 350 350 350 Low Power High Power Main Caps 2 150 180 2 110 110 2 2 2 2 4 4 Comments car car, truck car, truck A Monza car, truck car siamese aluminum

1956-67 1967-68 1968-73 1965-67 1976-79 1976-79 1978-79 1979-82 1976-85 1985-94 1979-82 1979-82 1973-76 1958-61 1955 1955-56 1957 1956-67 1957-59 1958-62 1956-67 1962-65 1956-67 1962-67 1961-62 1962-67 1964-67 1958-63 1968-69 1968-69 1968-69 1963 1956-67 1964-66 1962-63 1958-62 1964-68 1956-67 1956-67 1964-67 1968-76 1964-67 1964-67 1962-67 1965-67 1962-66 1964-67 1962-67 1963 1967 1967 1967 1968-69

383810 389257 391436 393288 460776 460777 460778 471511 581671 1489363 2135412 2404929 3030817 3556519 3703524 3720991 3731548 3736935 3737739 3756519 3756935 3782870 3789187 3789817 3789935 3790721 3791362 3794226 3794460 3814660 3814660 3830944 3832338 3834810 3834812 3837739 3849852 3849859 3849935 3852174 3855961 3858174 3858180 3858190 3862194 3864812 3868657 3876132 3889935 3892657 3892657 3892657 3892659

283 302 307 283 305 305 305 267 305 350 267 267 400 283 265 265 283 283 283 283 283 327 283 327 283 283 327 283 327 327 302 327 283 283 283 283 283 283 283 327 350 327 327 327 283 283 327 327 283 302 327 350 327

195 195 220 220 170 250 210 170 170 250 170 250 195 170 195 275 250 195 230 300 290 210 295 210

_ 225 283 290 315 375 275 315 220 300 195 250 300 220 195 220 350 300 220 290 350 295 -

2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

Z-28 car, truck car, truck car car, truck car, truck A car, truck car, truck car, no filter car, truck car, truck car, truck car, truck car, truck Late61car/vette Chevy II Replaced 3790721 Car & truck truck FA Camaro, Z-28 Car, truck & marine car & truck car & truck car, truck car Full, A & Y Chevy II car, truck truck Z-28, small journal car & truck Camaro

1967 1967 1967 1969-80 1968-73 1968 1968-69 1968-73 1968 1968 1968 1968 1965-67 1956-67 1974-75 1969-73 1969-73 1969 1969 1969 1969 1969 1968-69 1968-69 1968 1956-67 1970-80 1970-73 1962-67 1968-69 1969 1969 1969 1969 1969-76 1962-63 1956-67 1968 1969-79 1970-73 1969-73 1969-72 1968-76 1980-84 1980-84 1980-84 1980-82 1980-85 1980-85 1978-86 1979-82 1982 1979-82

3896944 283 3896948 283 3903352 327 3911460 350 3914635 307 3914636 307 3914638 327 3914653 307 3914660 327 3914678 302 3914678 327 3914678 350 3932288 283 3932338 283 3932368 350 3932371 307 3932373 307 3932386 302 3932386 327 3932386 350 3932388 302 3932388 350 3933100 327 3933180 327 3941174 307 3949852 283 3951509 400 3951511 400 3953512 327 3955618 327 3956618 302 3956618 327 3956618 350 3956632 307 3958618 350 3959512 327 3959532 283 3970010 327 3970010 350 3970014 350 3970020 307 3970024 307 6259425 350 14010201 305 14010202 305 14010203 305 14010205 267 14010207 350 14010209 350 14010231 305 14010280 267 14011064 350 14016375 267

195 195 210 200 210 290 210 295 290 210 300 290 300 150 255 290 235 250 200 250 185 200 115 130 -

195 195 350 200 300 290 350 295 290 210 350 290 300 265 265 290 235 350 200 370 300 200 200 -

2 replaced by 307 in 68 2 identical to 3834810 2 cars only 2 A 2 car 2 car & truck 2 2A 2 cars 2/4 Camaro, Z-28 2 car & truck 2 Camaro/ChevyII 2 A 2 2 2 car,truck 2 car,truck 4 Camaro Z28 2 Camaro 4 LT1 4 Z28 4 cars 2 2 2 truck 2 2/4 car,truck 4 B & G body 2 4 A,F,Vette 4 Z28 2 fullsize 2/4 cars 2 car & truck 2 A 2 2 2 A 2/4 car, truck, Vette 2/4 LA built Camaro 2 car,truck 2 A,F,X car,truck 2 car,truck 2 car,truck 2 car, truck 2 4 truck 4 truck 2 2 car 4 Chevrolet, high tin 2 -

1979-82 1978-85 1980-84 1978-88 1979-82 1978-86 1986-94 1987 1986-94 1986-92 1988-94 1986-94 1988-94 1986-94 1987-88 1969-85

14016376 14016379 14016381 14016383 14040205 14049047 14079287 14088526 14088548 14088551 14093627 14093638 14094766 14101148 14102058 14316379

267 350 305 305 267 305 350 350 350 305 305 350 305 350 305 350

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-

2 2 2 2 2 2 2 2 2 2 2

car car, truck car, truck Camaro -

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