CASTING #'S

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BIG BLOCK CASTING NUMBERS

Casting #

 Years
made		 Size HP levels
used for		 Notes
3946052 69 427 430 4-Bolt main
Aluminum ZL-1
3855961 66 - 67 396 325 & 360 2-Bolt main
3855962 65-66 396 360, 375 & 425 4-Bolt main
3869942 66-67 427 390 & 425 2 & 4-Bolt main
3873858 66 396 375 4-Bolt main
3902406 67 396 325, 350 & 375 2 & 4-Bolt main
3904351 67 427 385-435 2 & 4-Bolt main
3916321 68 427 385-435 2 & 4-Bolt main
3916323 68 396 325, 350 & 375 2 & 4-Bolt main
3935439 68-69 427 335-435 2 & 4-Bolt main
3935440 68 -69 396 265-375 2&4-Bolt main
3955270 69 427 335-435 2 & 4-Bolt main
3955272 69 396/402 265-375 2 & 4-Bolt main
3963512 69-71 427/454 335-450 2&4-Bolt main
3963513 73-76 454 215 2-Bolt main
3969854 69-72 396/402/454 240-360 2&4-Bolt main
3999289 72-78 454 215-270 2-Bolt main
3999290 72 402 240 2-Bolt main
6272177 72 402 210 2&4-Bolt main
14015445 75-87 454 210 & up 2&4-Bolt main

BIG BLOCK HEAD CASTING NUMBERS

 
Casting # Years
made		 Valve
Size		 HP levels
used for		 Notes
3904392 67 2.19/1.88 430 & 435 107 CC Chambers
L-88/L89 Aluminum 427
3919842 68-69 2.19/1.88 375, 430 & 435 107 CC Chambers
L-88/L-89 Aluminum 369/427
3946074 69-71 2.19/1.88 375-465 118 CC Chambers
L-88/ZL-1/LS-6/LS-7
369/402/247/454 Aluminum
10051128 90-94 2.19/1.88 Not Listed 72 CC Chambers
400cc Symetrical intake ports
Bowtie Aluminum
14011077 89-94 2.19/1.88 Not Listed 118 CC Chambers
295cc Intake Ports
Replacement C Port Aluminum
14044861 89-94 2.19/1.88 Not Listed 105 CC Chambers
380cc Intake Ports
Bowtie W Port Aluminum
3856208 65 2.06/1.72 375 & 425 109 CC Chambers
Z-16/L-37 396
3873858 66-67 2.06/1.72 375 & 425 109 CC Chambers
L-78/L-72 396/427
3904391 65-67 2.06/1.72 375 & 425 107 CC Chambers
L-78/L-71/L-72 396/427
3919840 67-69 2.06/1.72 375, 425 & 435 107 CC Chambers COPO
L-78/L-71/L-72 396/427
3964291 69-70 2.06/1.72 375, 425 & 435 108 CC Chambers 325cc Intake Ports
L-78/L-71/L-72/LS-6 396/402/427/454
3964292 70 2.06/1.72 450 109 cc Chambers LS-6 454
3994025
3994026
6258723		 71 2.06/1.72 425 118 CC Chambers LS-6 454
6272990
14096188
14097088		 71 & up 2.19/1.88 425 118 CC Chambers
325cc Intake Port
454/502
3856206 65-66 2.06/1.72 325 98 CC Chambers 396
3872702 66 2.06/1.72 325, 360 & 390 98 CC Chambers L-34/L-35/L-36
396/427
3904390 66-67 2.06/1.72 325, 350, 390 & 400 98 CC Chambers
L-34/L-35/L-36/L-68 396/427
3909802 66-67 2.06/1.72 325-400 101 CC Chambers
L-34/L-35/L-36/L-68 396/427
3917215 67-69 2.06/1.72 325-400 101 CC Chambers L-34/L-35 396/427
3931063 69-70 2.06/1.72 325-400 101 cc Chambers L-34/L-35 396/427
3964290
3964280		 69-70 2.06/1.72 325-400 101 CC Chambers
LS-5 396/402/427/454
3993820 71 2.06/1.72 300, 330 & 365 113 CC Chambers
LS-3/LS-5 402/454
3999241 72 2.06/1.72 240-365 113 CC Chambers
LS-3/LS-5 402/454
6272292 71 2.06/1.72 240 & 270 LS-3/LS-5 402/454

BIG BLOCK CRANK CASTING NUMBERS

 
Casting # Stroke Years
made		 Notes
3521 4.0 70-88 Forged LS-5, LS-6 High perf
353039 4.0 70-88 cast iron LS-4, LS-5
3732692 3.25 58 348 passenger
3733223 3.50 62-65 409 passenger
3733226 3.25 58 348 passenger
3741640
3741642		 3.25 59-61 348 passenger
33788072 3.50 61 409 passenger & truck
37558 3.50 61-62 409 passenger & truck
3804816 3.76 65-76 Car & truck HD
366, 396, 402 & 427
3856223 3.76 65-71 396/402
3863144 3.76 68-72 366, 396 & 402
3874874 3.76 66-76 366, 396 & 402
3882842
3882849		 3.76 -- 366/396/402
Truck
3904815 3.76 65-76 366, 396, 402 & 427
Truck
3963524 4.0 70-72 Forged
Truck
3967416 4.0 70-71 454
3967463 4.0 70-88 Forged High perf
Car, Truck & Corvette
6223 3.76 66-85 Forged High perf.
Car, Truck & Corvette
366, 396, 402 & 427
7115 3.76 65-76 366, 369, 402 & 427
Car & Truck
7416 4.0 70-88 Forged
Special high perf
& Heavy duty


BIG BLOCK INTAKE CASTING NUMBERS

 
Casting # carb style Years
made		 HP levels Notes
3866963 4-Brl 65 375 & 425 Aluminum L-37
396 Holley
3885069 4-Brl 66-68 375 & 425 Aluminum L-78/L-72
396/427 Holley
3886093 4-Brl 67 430340 Aluminum L-88 427
3894374 3X2 67 435 Aluminum
TRI-power 427
3894382 3X2 67 400 Aluminum Oval Port
TRI-power 427
3919849 4-Brl 68 390 Aluminum 427
Q-JET L-36
Oval Port
3919850 4-Brl 68 400 Aluminum 427
Oval Port L-68
3919878 4-Brl 68 375 & 425 Aluminum L-78/L72
369/427
3933163 4-Brl 68-69 375 & 425 COPO 396/427
l-78/l-89 Aluminum
3933198 4-Brl 68-69 430 L-88/ZL-1
Aluminum 427
3937793 4-Brl 68 390 L-36 Oval Port
Aluminum Q-JET
3937795 3X2 69 400 Aluminum TRI-Power
L-68 Oval Port 427
3937797 3X2 69 435 Aluminum TRI-Power
L-71 427
3947801 4-Brl 69 390 Aluminum L-36
Oval Port Q-JET 427
3963569 4-Brl 70-71 375 & UP L78/L89 & LS-6
Low Rise
396/402 & 454
3967474 4-Brl 71 425 Aluminum 427
6269318 4-Brl 72 Not Listed Aluminum 454
3866948 4-Brl 66-67 325, 360 & 390 L-34/L-35 Holley
396/427
3883948 4-Brl 66-68 325, 385 & 390 L-35/L-36 396/427
3931067 4-Brl 69 325, 335 & 390 L-35/L-36 396/427
3955287 4-Brl 70-71 300-390 402 & 454
6263753 4-Brl 72 240 & 270 402 & 454
3856289 4-Brl 65-66 325 L-35 396

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