Big Block Chevy Parts Identification

BBC Aluminum Engine Block Casting Numbers
Casting #YearCIDHP/RPO/Comments/Applications
39460521969427430 ZL-1, 4 bolt

BBC Iron Engine Block Casting Numbers
Casting #YearCIDHP/RPO/Comments/Applications
3402201972-76427 tall truck
3450141974-86454 truck
3462361974-76454 215, 2 bolt
3590701974-90454 truck
3619591973-85454 car & truck
3647761968-84427 tall truck
3647791968-88366 tall truck
4734781968-84427 tall truck
37828701968-76427 tall truck
38559611966-67396 325, 360, 2 bolt
38559621965-66396 360, 375, 425, 4 bolt
38559771965-67366 tall truck
38699421966-67427 390, 425, 2&4 bolt
38738581966396 375, 4 bolt
39024061967396 325, 350, 375, 2&4 bolt
39043511967427385, 390, 400, 425, 430, 435, 2&4 bolt
39043541966-67366 tall truck
39163191968-85366 tall truck
39163211968427385, 390, 400, 425, 430, 435, 2&4 bolt
39163231968396325, 350, 375, 2&4 bolt
39255211968-85366 tall truck
39354391968-69427 335, 390, 400, 425, 430, 435, 2&4 bolt
39354401968-69396 265, 325, 350, 375, 2&4 bolt
39377241968-85366 tall truck
39377261968-84427 tall truck
39552701969427335, 390, 400, 425, 430, 435, 2&4 bolt
39552721969396/402265, 325, 350, 375, 2&4 bolt
39552741968-85366 tall truck
39552761968-84427 tall truck
39635121969-71427 335, 390, 400, 425 COPO, 430, 435,
454 345, 360, 365, 390, 425, 450 2&4 bolt
39635131973-76454 215
39698541969-72396/402240, 265, 300, 325, 330, 350, 375,
454360, 2&4 bolt
39698581968-84427 tall truck
39992891972-78454 215, 235, 240, 270, 2 bolt, car & truck
39992901972402240, 2 bolt
39992931968-85366 tall truck
39992941968-84427 tall truck
62721771972402210
14015441975-87454 truck

BBC Cylinder Head Casting Numbers
RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust
CastingYearsCIDChamberHP/RPO/Comments
39043921967427 Closed430, 435 L-88/L-89, 106.8cc, 1.72 ex
39198421968-69396 375 L-89
427 Closed430, 435 L-88/L-89, 106.8cc, 1.84 ex
39460741969-71396,402 375 L-89, 427 430 L-88/ZL-1
454 Open425, 465 LS-6/LS-7, 118.Occ, round ex
10051128 1990-94 454 Semi Open 72cc, IP 400cc, bowtie, sym port
14011077 1989-94454 Open 118.Occ, IP 295cc, replacement, C port
140448611989-94454 Open425, 105.Occ, IP 380cc, bowtie, W port
38562081965396Closed375, 425 Z-16/L-37, 108.9cc, 1.72 ex
38738581966-67396 375 L-78
427Closed425 L-72, 108.9cc, 1.72 ex
39043911965-67396 375 L-78
427Closed425, 435 L-71/L-72, 106.8cc, 1.72 ex
39198401967-69396 375 L-78, 1.72.ex
427Closed425, 435 L-71/L-72, 425 COPO, 106.8cc
39642911969-70396/402 375 L-78, Intake Port 325cc
427 425, 435 L-71/L-72
454 Closed450 LS-6, 108.Occ
39642921970454 Closed450 LS-6, 109.Occ
39940251971454 Open425 LS-6, 118.Occ
39940261971454 Closed425 LS-6, 118.Occ
62587231971454 Open425
62729901971-94454 Open425, 118.Occ, IP 325cc
14096188 1987-94 454Open 425, 118.Occ, IP 325cc, replacement
14097088 1989-94 502 OpenGEN V, 118.Occ, IP 325cc, replacement
OVAL PORT - Valve size 2.06 intake, 1.72 exhaust
CastingYearsCIDChamberHP/RPO/Comments

BBC Camshaft Part Numbers
Part #YearType LiftDur @ .050 liftComments/Specs/RPO's/Apps
340282 Solid .560I/.560E Lift .262I/.262E 121 deg overlap, competition-short track apps
3530401973-74Hyd .440I/.440E Lift .210I/.210E production Corvette
38631431965-71Solid .520I/.520E Lift .242I/.242E See Note 1
38839861965-72 Hyd .460I/.488E Lift .213I/.217E See Note 2
3904362 1965-71 Solid .520I/.520E Lift .242I/.242E See Note 3
3925533 1965-69 Solid .540I/.560E lift .262I/.269E 133 deg overlap, 427 L-88, Reverse rotation
3925535 1965-69Solid .540I/.560E Lift .262I/.269E 133 deg overlap, 427 L-88, standard rotation
3959180 1969-70Solid .560I/.600E lift .262I/.273E 135 deg overLap, 427 ZL-1, 454 LS-7
3994094 Solid .600I/.600E Lift .286I/.286E See Note 4
6272989 Hyd .500I/.500E Lift .222I/.221E 121 deg overlap, marine grind or HP street
14096209 Hyd .500I/.500E Lift .222I/.221E 121 deg overlap, marine grind or HP street (6272989)

Note 1: 80 deg overlap, 396 375hp L-78/L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street
Note 2: 396 325/350hp L-34/L-35, 427 385/390/400hp L-36/L-68, 454 345/360/390hp LS-4/LS-5, good torque/HP
Note 3: 80 deg overlap, 396 375hp L-78/ L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street
Note 4: 148 deg overlap, maximum power with F.I. or tunnel ram, Can Am

BBC Crankshaft Part Numbers
Casting #YearCIDComments/Specs/RPO's/Apps
330570 427 truck,1053,forging number 6223
3367821970-74 454 with automatic transmission
38796211967 427 L-88, See Note 1
38828411965-71 396 See Note 2
38828421965-69 427 forged, cross drilled, balanced for 11:1 CR
3882849 1966-69 427
38871141965396 tufftrided, 5140
3963521 454 4 in stroke, 5140, raw forged
39635231970-71454 LS-6, See Note 3
39635241970-71454 LS-7, See Note 4
39657461965-69430 raw forged, semi finished, 3.4-3.8 stroke
39657531970-72495 raw forged, semi finished, 3.9-4.25 stroke, 5140
39678111968-69427 L-88/ZL-1, See Note 5
39759451970454 with manual transmission
3993804427 raw forged, 3.75 stroke, 5140
39938781971-72 454 LS-6
10051169454 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 Exhaust Manifold Casting Numbers
Cast # YearsSideCIDApplications
3292251973-76LH454
3530281973-76LH454
3530301973-76LH454police
38562971965LH396325
38563011965LH396425 Corvette
38563021965RH396 425 Corvette
38563061965RH396 325
38572971965LH396 325
38688741965-66RH396325, 360, 375 Z-16
38699251965LH396 375 Z-16
38727701966RH396
38808271966-69LH427/454 Corvette
38808281966-72RH427/454 Corvette
38808691970-72LH454 Corvette
38839991966LH396 325, 360, 375
38845041966-67RH396/427 325, 385, 390
38923071966-67LH396/427 325, 390
39024011967LH396
39043991966LH396
39098791967-70LH396/427 COPO/454 325, 350, 375, 425, 430
39098801967RH396 325, 350, 375
39146131968-70LH396/427 265, 325, 335, 345, 390, 425
39161781968-70RH396/427 COPO/454 325, 350, 375, 425, 430
39698691970-74LH454 Corvette
39893101971-72RH402/454
39893431971-72LH402/454
39940451973-75LH454 police


Last updated: 12/15/1997
AuthorMadMike Maciolek
Email: m_maciolek@vmsnet.enet.dec.com

Email: iracez28@stc.net

1997 Maciolek Engineering.
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