some nubers

Big Block Chevy Engine Parts Identification
Engine Blocks | Cylinder Heads | BBC Cams | Crankshafts | Intake Manifolds | Exhaust Manifolds |

BBC Engine Block Casting Numbers
Casting # Year CID Comments
340220 1972-76 427 tall truck
345014 1974-86 454 truck
346236 1974-76 454 215, 2 bolt
359070 1974-90 454 truck
361959 1973-85 454 car & truck
364776 1968-84 427 tall truck
364779 1968-88 366 tall truck
473478 1968-84 427 tall truck
3782870 1968-76 427 tall truck
3855061 1965-67 396
3855961 1966-67 396 325, 360, 2 bolt
3855962 1965-66 396 360, 375, 425, 4 bolt
3855977 1965-67 366 tall truck
3866961 1966-69 396 Chevy, Chevy truck
3869942 1966-67 427 390, 425, 2&4 bolt
3873858 1966 396 375, 4 bolt
3902406 1967 396 325, 350, 375, 2&4 bolt
3902466 1965-67 396 ??
3904351 1967 427 385, 390, 400, 425, 430, 435, 2&4 bolt
3904354 1966-67 366 tall truck
3916319 1968-85 366 tall truck
3916321 1968 427 385, 390, 400, 425, 430, 435, 2&4 bolt
3916323 1968 396 325, 350, 375, 2&4 bolt
3918319 1966-70 366 Chevy truck, GMC, tall truck
3925521 1968-85 366 tall truck
3928319 1969-73 366 GMC, tall truck
3935439 1968-69 427 335, 390, 400, 425, 430, 435, 2&4 bolt
3935440 1968-69 396 265, 325, 350, 375, 2&4 bolt
3937724 1968-85 366 tall truck
3937726 1968-84 427 tall truck
3955270 1969 427 335, 390, 400, 425, 430, 435, 2&4 bolt
3946052 1969 427 430 ZL-1, 4 bolt, aluminum
3955272 1969 396/402 265, 325, 350, 375, 2&4 bolt
3955274 1968-85 366 tall truck
3955276 1968-84 427 tall truck
3963512 1969-71 427 335, 390, 400, 425 COPO, 430, 435,
454 345, 360, 365, 390, 425, 450 2&4 bolt
3963513 1973-76 454 215
3965440 1968-69 396
3965449 1968-72 396
3965540 1968 396
3969854 1969-72 396/402 240, 265, 300, 325, 330, 350, 375,
454 360, 2&4 bolt
3969858 1968-84 427 tall truck
3999289 1972-78 454 215, 235, 240, 270, 2 bolt, car & truck
3999290 1972 402 240, 2 bolt
3999293 1968-85 366 tall truck
3999294 1968-84 427 tall truck
6272176 1968-76 366 Chevy, GMC, tall truck
6272177 1972 402 210
6272181 1973-76 427 tall truck
1401544 1975-87 454 truck

Big Block Chevy Cylinder Heads
Open vs. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head.
Use of either style head requires that the correct pistons are used, otherwise...

BBC Cylinder Head Casting Numbers
RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust
Casting Years CID Chamber CC HP/RPO/Comments
3904392 1967 427 Closed 106.8 430, 435 L-88/L-89, 1.72 ex
3919842 1968-69 396 375 L-89
427 Closed 106.8 430, 435 L-88/L-89, 1.84 ex
3946074 1969-71 396,402 375 L-89, 427 430 L-88/ZL-1
454 Open 118.0 425, 465 LS-6/LS-7, round ex
10051128 1990-94 454 Semi Open 72cc, IP 400cc, bowtie, sym port
14011077 1989-94 454 Open 118.0cc, IP 295cc, replacement, C port
14044861 1989-94 454 Open 425, 105.0cc, IP 380cc, bowtie, W port
3856208 1965 396 Closed 108.9 375, 425 Z-16/L-37, 1.72 ex
3873858 1966-67 396 375 L-78
427 Closed 108.9 425 L-72, 1.72 ex
3904391 1965-67 396 375 L-78
427 Closed 106.8 425, 435 L-71/L-72, 1.72 ex
3919840 1967-69 396 375 L-78, 1.72.ex
427 Closed 109.0 425, 435 L-71/L-72, 425 COPO
3964291 1969-70 396/402 375 L-78, Intake Port 325cc
427 425, 435 L-71/L-72
454 Closed 450 LS-6, 108.0cc
3964292 1970 454 Closed 450 LS-6, 109.0cc
3994025 1971 454 Open 425 LS-6, 118.0cc
3994026 1971 454 Closed 425 LS-6, 118.0cc
6258723 1971 454 Open 425
6272990 1971-94 454 Open 425, 118.0cc, IP 325cc
14096188 1987-94 454 Open 425, 118.0cc, IP 325cc, replacement
14097088 1989-94 502 Open GEN V, 118.0cc, IP 325cc, replacement

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
336765 1973-84 427/454 Open
336781 1973-85 454 Open 113.0cc
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 113.0cc
346238 1975-87 454 Open 113.0cc
353049 1970-73 402/454 Open 113.0cc
473328 1968-85 366 Open
3856206 1965-66 396 Closed 325 97.2cc
3856213 1966-70 366 Closed truck
3872702 1966 396 325, 360 L-34/L-35
427 Closed 390, L-36 98.4cc
3876875 1966-70 427 Closed truck
3904390 1966-67 396 325, 350 L-34/L-35
427 Closed 390, 400, L-36/L-68 98.4cc
3904393 1966-68 366 Closed truck
3909802 1966-67 396 325, 350 L-34/L-35
427 Closed 385, 390, 400, L-36/L-68 100.9cc
3917215 1967-69 396 325, 350 L-34/L-35
427 Closed 335, 385, 390, 400 100.9cc
3917219 1966-70 366/427 Closed truck
3931063 1969-70 396 325, 350 L-34/L-35
427 Closed 335, 385, 390, 400 100.9cc
3933148 1969 366/396 Open 2V/427 265 122.1cc car & truck
3933149 1969-70 427 Open 122.1 cc truck
3964280 1966-70 427 335, 385, 390, 400
454 Closed 345, 360, 390 LS-5
3964290 1969-70 396/402 325, 330, 350
427 335, 385,390, 400
454 Closed 345, 360, 390 LS-5 100.9cc
3965198 1969 396 truck
3975950 1968-70 366/427 Closed truck
3986133 1970-85 366/427 Closed truck
3986136 1970-84 366/427 Closed truck
3993820 1971 402 300, 330 LS-3
454 Open 365 LS-5 113.0cc
3999241 1972 402 240, 300, 330 LS-3
454 Open 365 LS-5 113.0cc
6272292 1971 402 240, LS-3
454 Open 270, LS-5
10101136 1991-94 454 Open truck
10121033 1978-88 454 Open truck
12352783 1979-93 454 Open truck
14025175 1983-93 454 Open truck
14081044 1986-90 454 Open truck
14092359 1986-89 427 Open truck
14092360 1985-89 454 Open truck
14101398 1986-90 454 Open truck

Crankshaft Part Numbers
Casting # Year CID Comments/Specs/RPO's/Apps
330570 427 truck,1053,forging number 6223
336782 1970-74 454 with automatic transmission
3879621 1967 427 L-88, See Note 1
3882841 1965-71 396 See Note 2
3882842 1965-69 427 forged, cross drilled, balanced for 11:1 CR
3882849 1966-69 427
3887114 1965 396 tufftrided, 5140
3963521 454 4 in stroke, 5140, raw forged
3963523 1970-71 454 LS-6, See Note 3
3963524 1970-71 454 LS-7, See Note 4
3965746 1965-69 430 raw forged, semi finished, 3.4-3.8 stroke
3965753 1970-72 495 raw forged, semi finished, 3.9-4.25 stroke, 5140
3967811 1968-69 427 L-88/ZL-1, See Note 5
3975945 1970 454 with manual transmission
3993804 427 raw forged, 3.75 stroke, 5140
3993878 1971-72 454 LS-6
10051169 454 raw forged, 4340, 3.75-4.25

Note 1: L-88, with 3/8 in bolt rods, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 2: forged, cross drilled, 3.76 stroke, tufftrided, balanced for 11:1 CR
Note 3: 1053, tufftrided, cross drilled, balanced for 9.25:1 or 11.25:1 CR, forging number - 3520 and 7416
Note 4: 4 in stroke, HD, 5140, LS-7, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 5: tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115

BBC Intake Manifold Casting Numbers
ALUMINUM RECTANGULAR PORT - Holley 4V
Casting Years CID HP/RPO/Config
3866963 1965 396 375, 425 L-37
3885069 1966-68 396 375 L-78
427 425 L-72
3886093 1967 427 430 L-88
3894374 1967 427 435 3x2 L-71
3894382 1967 427 400 3x2 L-68, oval port
3919849 1968 427 390 L-36, oval port, Qjet
3919850 1968 427 400 3x2 L-68, ovat port
3919852 1968 427 435 3x2 L-71
3919878 1968 396 375 L-78
427 425 L-72
3933163 1968-69 396 375 L-78/L-89
427 425 copo
3933198 1968-69 427 430 L-88/ZL-1
3937793 1968 427 390 L-36, oval port, Qjet, Late
3937795 1969 427 400 3x2 L-68, oval port
3937797 1969 427 435 3x2 L-71
3947801 1969 427 390 L-36, oval port, Qjet
3963569 1970-71 396/402 375 L-78/L-89
454 LS-6, lowrise
3967474 1971 454 425
6269318 1972 454

BBC Intake Manifold Casting Numbers
IRON OVAL PORT - Rochester Q-jet 4V
Casting Years CID HP/RPO/Config
336789 1974 454 235, 270
346242 1975 454 215
353015 1973 454 215, 245
393841 1973-75 454 215
3856289 1965-66 396 325 L-35
3866948 1966-67 396 325, 360 L-34/L-35
427 390, Holley
3883948 1966-68 396 325 L-35
427 385, 390 L-36
3931067 1969 396 325 L-35
427 335, 390 L-36
3952900 1969 396 265 2V
3955287 1970-71 402 300, 330, 350 LS-3
454 360, 365, 390
6263753 1972 402 240 LS-3
454 240, 270

Last revision: 9/20/2006
Author: MadMike Maciolek
Email: tech@nastyz28.com

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