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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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This is a great car, there is no project to finish here. The car is in excellent condition. You won't find a straighter, cleaner body. The car has been carefully maintained since it was built. It's a great old car cruiser with the modern conveniences. You'll find power seats, A/C, and power steering. It has a Camaro subframe and a Buick V-6/auto drive train. Since it is a V-6 it has enough power when you need it, but is still great on gas. The car was built for drivability, comfort and style. It runs and drives great. It always fires right up and is very dependable.