Big Block Chevy Engine Parts Identification

1 Big Block Chevy Engine Parts Identification Big Block Chevy Engine Parts Identification Big Block Chevy Engine Parts Identification Big Block Chevy Engine Parts Identification Engine Blocks | Cylinder Heads | BBC Cams | Crankshafts | Pistons | Intake Manifolds | Exhaust Manifolds | Balancer/Flywheel Info | BBC Engine Block Casting NumbersBBC Engine Block Casting NumbersBBC Engine Block Casting NumbersBBC Engine Block Casting Numbers Casting # Year CID HP/RPO/Comments/Applications 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 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.

3 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, BBC Cylinder Head Casting NumbersBBC Cylinder Head Casting NumbersBBC Cylinder Head Casting NumbersBBC Cylinder Head Casting Numbers RECTANGULARRECTANGULARRECTANGULARRECTANG ULAR PORT PORT PORT PORT ---- Valve size intake, exhaust Valve size intake, exhaust Valve size intake, exhaust Valve size intake, exhaust Casting Years CID Chamber CC HP/RPO/Comments 3904392 1967 427 Closed 430, 435 L-88/L-89, ex 3919842 1968-69 396 375 L-89 427 Closed 430, 435 L-88/L-89, ex 3946074 1969-71 396,402 375 L-89.

4 427 430 L-88/ZL-1 454 Open 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 , IP 295cc, replacement, C port 14044861 1989-94 454 Open 425, , IP 380cc, bowtie, W port 3856208 1965 396 Closed 375, 425 Z-16/L-37, ex 3873858 1966-67 396 375 L-78 427 Closed 425 L-72, ex 3904391 1965-67 396 375 L-78 427 Closed 425, 435 L-71/L-72, ex 3919840 1967-69 396 375 L-78, 427 Closed 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, 3964292 1970 454 Closed 450 LS-6, 3994025 1971 454 Open 425 LS-6, 3994026 1971 454 Closed 425 LS-6, 6258723 1971 454 Open 425 6272990 1971-94 454 Open 425, , IP 325cc 14096188 1987-94 454 Open 425, , IP 325cc, replacement 14097088 1989-94 502 Open GEN V, , IP 325cc, replacement OVAL PORT OVAL PORT OVAL PORT OVAL PORT ---- Valve size intake, exhaust Valve size intake, exhaust Valve size intake, exhaust Valve size intake.

5 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 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 346238 1975-87 454 Open 353049 1970-73 402/454 Open 473328 1968-85 366 Open 3856206 1965-66 396 Closed 325 3856213 1966-70 366 Closed truck 3872702 1966 396 325, 360 L-34/L-35 427 Closed 390, L-36 3876875 1966-70 427 Closed truck 3904390 1966-67 396 325, 350 L-34/L-35 427 Closed 390, 400, L-36/L-68 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 3917215 1967-69 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 3917219 1966-70 366/427 Closed truck 3931063 1969-70 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 3933148 1969 366/396 Open 2V/427 265 car & truck 3933149 1969-70 427 Open 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.

6 385,390, 400 454 Closed 345, 360, 390 LS-5 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 3999241 1972 402 240, 300, 330 LS-3 454 Open 365 LS-5 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 BBC Camshaft part NumbersBBC Camshaft part NumbersBBC Camshaft part NumbersBBC Camshaft part Numbers part # Year Type Lift Dur @.

7 050 lift Comments/Specs/RPO's/Apps 340282 Solid .560I/.560E .262I/.262E 121 deg overlap, competition-short track apps 353040 1973-74 Hyd .440I/.440E .210I/.210E production Corvette 3863143 1965-71 Solid .520I/.520E .242I/.242E See Note 1 3883986 1965-72 Hyd .460I/.488E .213I/.217E See Note 2 3904362 1965-71 Solid .520I/.520E .242I/.242E See Note 3 3925533 1965-69 Solid .540I/.560E .262I/.269E 133 deg overlap, 427 L-88, Reverse rotation 3925535 1965-69 Solid .540I/.560E .262I/.269E 133 deg overlap, 427 L-88, standard rotation 3959180 1969-70 Solid .560I/.600E .262I/.273E 135 deg overLap, 427 ZL-1, 454 LS-7 3994094 Solid.

8 600I/.600E .286I/.286E See Note 4 6272989 Hyd .500I/.500E .222I/.221E 121 deg overlap, marine grind or HP street 14096209 Hyd .500I/.500E .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 or tunnel ram, Can Am BBC Crankshaft part NumbersBBC Crankshaft part NumbersBBC Crankshaft part NumbersBBC 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.

9 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, stroke 3965753 1970-72 495 raw forged, semi finished, stroke, 5140 3967811 1968-69 427 L-88/ZL-1, See Note 5 3975945 1970 454 with manual transmission 3993804 427 raw forged, stroke, 5140 3993878 1971-72 454 LS-6 10051169 454 raw forged, 4340, Note 1: L-88, with 3/8 in bolt rods, balanced for :1 CR, tufftrided, cross drilled Note 2: forged, cross drilled, stroke, tufftrided, balanced for 11:1 CR Note 3: 1053, tufftrided, cross drilled, balanced for :1 or :1 CR, forging number - 3520 and 7416 Note 4: 4 in stroke, HD, 5140, LS-7, balanced for :1 CR, tufftrided, cross drilled Note 5.

10 Tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115 BBC Exhaust Manifold Casting NumbersBBC Exhaust Manifold Casting NumbersBBC Exhaust Manifold Casting NumbersBBC Exhaust Manifold Casting Numbers Cast # Years Side CID Applications 329225 1973-76 LH 454 353028 1973-76 LH 454 353030 1973-76 LH 454 police 3856297 1965 LH 396 325 3856301 1965 LH 396 425 Corvette 3856302 1965 RH 396 425 Corvette 3856306 1965 RH 396 325 3857297 1965 LH 396 325 386