Chevrolet
Chevrolet Big Block Cylinder Head Casting
Numbers
RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust
| Casting | Years | CID | Chamber | CC | HP/RPO/Comments |
| 3856208 | 1965 | 396 | Closed | 109cc | 375hp/425hp z-16 chevelle |
| 3873858 | 1966-67 | 396/427 | Closed | 109cc | 375 L-78 |
| 3904391 | 1967 | 396/427 | Closed | 107cc | L-71/L-72, 1.72 |
| 3904392 | 1967 | 427 | Closed | 106.8 | 430, 435 L-88/L-89, 1.72 ex |
| 3919840 | 1967-69 | 396/427 | Closed | 107 | 375 L-78 425, 435 L-71/L-72, 425 COPO |
| 3919842 | 1968-69 | 396/427 | Closed | 106.8 | 375 L-89 430, 435 L-88/L-89, 1.84 ex |
| 3946074 | 1969-71 | 396/402/427/454 | Open | 118cc | 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 |
| 3964291 | 1969-70 | 396/402/427/ | Closed | 109cc | 396/402/427/454 large or small spark plug |
| 3964292 | 1970 | 454 | Closed | 109cc | 450 LS-6, |
| 3994025 | 1971 | 454 | Open | 118cc | 425 LS-6, |
| 3994026 | 1971 | 454 | Open | 118cc | LS6 |
| 6258723 | 1971 | 454 | Open | . | . |
| 6272990 | 1970 | 454 | Open | 118cc | service replacement mkIV |
| 10045427 | 400/454/455 | . | . | Pontiac/chevy aluminium small port /race | |
| 10051128 | 1990-94 | 454 | Semi Open | 72cc | IP 400cc, bowtie, sym port |
| 12363401 | 1996-up | . | Open | 118cc | bowtie aluminium mkIV gen.V gen.VI |
| 12562934 | 2000-up | 502 | Open | . | gen.VI 502 marine |
| 14011077 | 1989-94 | 454 | Open | 118cc | IP 295cc, replacement, C port |
| 14044861 | 1989-94 | 454 | Open | 115 | 425, 105.0cc, IP 380cc, bowtie, W port |
| 14096188 | 1970-71 | 454 | Open | 118cc | service replacement ls-6 markIV |
| 14097088 | 1991-up | 454/502 | Open | 118 | . |
| 24502585 | 1997 | . | . | . | olds/chevy aluminium |
OVAL PORT - Valve size 2.06 intake, 1.72 exhaust
| Casting | Years | CID | Chamber | CC | HP/RPO/Comments |
| 330864 | 1970-81 | 366/427/454 | Open | . | . |
| 330865 | 1970-84 | 366/427/454 | Open | . | . |
| 330866 | 1968-78 | 366/427 | Open | . | . |
| 330867 | 1968-73 | 427t | Open | . | . |
| 336765 | 1973-84 | 427/454 | Open | . | . |
| 336768 | 1973-76 | 427t | Open | . | . |
| 336781 | 1973-85 | 454 | Open | 113cc | . |
| 343771 | 1968-85 | 366/427/454 | Open | . | . |
| 343772 | 1976-84 | 366/427/454 | Open | . | . |
| 343783 | 1975-78 | 454 | Open | . | car & truck |
| 346236 | 1975-87 | 454 | Open | 113cc | . |
| 346238 | 1975-87 | 454 | Open | 113cc | . |
| 352625 | 1970-76 | 454 | Open | . | truck |
| 353049 | 1970-73 | 402/454 | Open | 113cc | . |
| 366725 | 1974-78 | 427 | . | . | . |
| 473328 | 1968-85 | 366 | Open | . | . |
| 3856206 | 1965-66 | 396 | Closed | 97.2cc | 325 |
| 3856213 | 1966-70 | 366 | Closed | . | truck |
| 3856260 | 1968 | 396 | Closed | . | truck |
| 3872702 | 1966 | 396/427 | Closed | . | 325, 360 L-34/L-35 390, L-36 98.4cc |
| 3876875 | 1966-70 | 427 | Closed | . | truck |
| 3904390 | 1966-67 | 396/427 | Closed | . | 325, 350 L-34/L-35 390, 400, L-36/L-68 98.4cc |
| 3904393 | 1966-68 | 366 | Closed | . | truck |
| 3908952 | 1967 | 427 | Open | . | truck marine |
| 3909802 | 1966-67 | 396/427 | Closed | 109cc | L-34/L-35 L-36/L-68 |
| 3917215 | 1967-69 | 396/427 | Closed | 109 | 325, 350 335, 385, 390, 400 L-34/L-35 |
| 3917219 | 1966-70 | 366/427 | Closed | . | truck |
| 3931063 | 1969-70 | 396/427 | Closed | 109cc | 325, 350 335, 385, 390, 400L-34/L-35 |
| 3933148 | 1969 | 366/396 | Open | 122cc | 2V/427 265 car & truck |
| 3933149 | 1969-70 | 427 | Open | 122cc | truck |
| 3935401 | 1968-76 | 427 | Open | . | . |
| 3964280 | 1966-70 | 427/454 | Closed | . | 335, 385, 390, 400 LS-5 |
| 3964290 | 1969-70 | 396/402/427/454 | Closed | 109cc | 325, 330, 350 400 ls-5 |
| 3965198 | 1969 | 396 | . | . | truck |
| 3975950 | 1968-70 | 366/427 | Closed | . | truck |
| 3986133 | 1970-85 | 366/427 | Closed | . | truck |
| 3986135 | 1969-73 | 366/427 | Open | . | . |
| 3986136 | 1970-84 | 366/427 | Closed | . | truck |
| 3993820 | 1971 | 402/454 | Open | 113cc | 300, 330 LS-3 365 LS-5 |
| 3999241 | 1972 | 402/454 | Open | 113cc | 240, 300, 330 LS-3 365 LS-5 |
| 6272292 | 1971 | 402/454 | Open | . | 240, LS-3 270, LS-5 |
| 10052902 | 427 | Open | . | MKIV | |
| 10101136 | 1991-94 | 454 | Open | . | truck |
| 10114140 | 1991-up | 366/427 | Closed | . | gen.V |
| 10114156 | 1991-up | 454 | Open | 118cc | gen.V |
| 10121033 | 1978-88 | 454 | Open | . | truck |
| 10141279 | 1996-up | . | Open | 100cc | Vortec7400 |
| 10487052 | 1977-90 | 366 | Open | . | . |
| 12352783 | 1979-93 | 454 | Open | . | truck |
| 12363391 | 1996-up | . | Open | 110cc | aluminium MKIV gen.V gen.VI |
| 12558162 | 2001-up | 496 | Closed | . | VII Voretc 8100 truck |
| 12560241 | 1998 -up | . | Closed | 100cc | Voortec 7400 |
| 14025175 | 1983-93 | 454 | Open | . | truck |
| 14081044 | 1986-90 | 454 | Open | . | truck |
| 14081045 | 1978-87 | 454 | Open | . | . |
| 14081052 | 1985-87 | 366/427/454 | Open | . | truck Marked HIPERF |
| 14092359 | 1986-89 | 427 | Open | . | truck |
| 14092360 | 1985-89 | 454 | Open | . | truck |
| 14101398 | 1986-90 | 454 | Open | . | truck |