BBC Heads Casting Numbers

  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   Vortec 7400

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   Vortec 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