Chevy Casting Numbers

SBC Block Casting Numbers |  SBC Head Casting Numbers | SBC Crank Casting Numbers
SBC Intake Casting Numbers | GM Tranny Ratios
SBC Block Casting Numbers(top)

Casting # Years
made Size HP levels
used for Notes
3703524 55 265 N/A Passenger
First 6 mos. used mech. cam not hyd.
3720991 56 - 57 265 N/A Truck/Pass
3731548 57 283 N/A N/A
3556519
3737739 58 - 61 283 220-290 2-Bolt mains/Truck/Pass
3849852 58 - 64 283 220-315 2-Bolt mains/Truck/Pass
3789935
3864812 62 - 64 283 230-315 2-Bolt mains/Truck/Pass
3959512 62 - 63 327 250 2-Bolt mains
3789817
3794460
62 - 64 327 250 2-Bolt mains
Truck/Pass
3858174 62 - 67 350, 327 & 302 210-350 2-Bolt mains/Truck/Pass
3782870 62 - 67 327 250-375 2-Bolt mains/Truck/Pass
3858180 62 - 67 327 250-375 2-Bolt mains/Truck/Pass
3791362 65 - 67 327 N/A 2-Bolt mains/Chevy II
3892657
3782870
3903352
3789817
64 - 67 350, 327 & 302 210-350 2-Bolt mains
Truck/Pass
3849852
3849935
3896944
393288
65 - 67 283 N/A Truck/Pass
389257 67 - 69 302 N/A 2-Bolt mains
67 Small Journal (327 block)
68-69 Large Journal (350 block)
3914653
3914636
3932373
3970020
68 - 73 307 N/A Truck/Pass
3956632 69 307 200 2-bolt mains
3914660 68 327 210-275 2-bolt mains
3790041
3814660
3955618
68 - 69 327 210-300 2-Bolt mains
Corvette/Camaro/Hi PO
3914678 68 - 79 350, 327 &: 302 210-350 2-Bolt mains
3855961
3958618
3970014
6259425
68 - 76 350 210-300 2-bolt mains
Pass.
3970014 68 - 79 350 200-255 2&4-Bolt main
3956618
3932386
68 - 79 350 & 302 250-300 4 bolt mains
Truck/Hi Perf
3970010 68 - 79 350 & 327 145-375 2&4-Bolt mains/Truck/Hi Perf
3932388 69 350 300 4-bolt mains
3951511 70 - 73 400 255-265 4 Bolt mains/HD Truck/Pass
330817 70 - 80 400 150-180 2-Bolt mains
360851 74 - 76 262 N/A Monza
3951509
3030817++
74 - 76 400 150-265 2 Bolt Mains
++High Nickel Block
460776
460777
460778
361979
78 - 79 305 N/A Lt. Truck/Pass
14016379 78 - 79 350 N/A Lt.Truck/Pass
366245* 78 - 79 350 N\A 4-Bolt mains
*Bowtie High Tin
Dipstick in Pan
1401280
14016376
471511
79 - 82 267 N/A Passenger
14010201
14016381
14010202
14010203
80 - 84 305 N/A Lt. Truck/Pass
1401029
14010207
14010209 80 - 85 350 205 & up 2&4-Bolt mains
Passenger cars
14011064* 82 - 86 350 N\A 4-Bolt mains/*Bowtie High Tin
14088548
14093638
14316379 86 - 88 350 205 & up 2&4-Bolt mains
1 piece rear main seal.
SBC Head Casting Numbers(top)
Casting # Years
made Valve
Size HP levels
used for Chamber Size / Notes
3782461 61-70 1.94/1.50
& 2.02/1.6 250-375 64 CC Chambers
No bolt holes
These are the double humps.
3890462 62-68 1.94/1.50
& 2.02/1.6 250-350 64 CC Chambers
No bolt holes
These are also double humps.
3927185 69 1.72/1.50 200-210 70cc Chambers
3927185 69 1.72/1.50 200-210 70cc Chambers
3917293 68 1.72/1.50 210 76cc Chambers
3917291 62-69 1.94/1.50
& 2.02/1.6 275-350 64 CC Chambers
No bolt holes
These are the 'Turbo' heads.
3927186 68-72 1.94/1.50
& 2.02/1.6 290-370 64 CC Chambers
has bolt holes
These are the 'powerpack' heads.
3932441 67-79 1.94/1.50 250 & 255 76 CC Chambers
Intake flow 152 CFM
Exhaust flow 93.2 CFM
3947040 68-70 1.94/1.50
& 2.02/1.6 290-370 64 CC Chambers
3947041 68-70 1.94/1.50
& 2.02/1.6 290-370 64 CC Chambers
3973414 64-70 2.02/1.6 360 & 370 64 CC Chambers
Z-28 & Corvette LT-1.
3973487 68-79 1.94/1.50
& 2.02/1.6 165-330 76 CC Chambers
X casting has 10 more intake
cc volume.
3998993 68-79 1.72/1.50
& 1.94/1.50 115-175 76 CC Chambers
Intake flow 150.8 CFM
Exhaust flow 91.1 CFM
333882 70-80 1.94/1.50 150-180 76CC Chambers
Intake flow 137.2 CFM
Exhaust flow 95.4 CFM
462624 76-87 1.94/1.50
& 2.02/1.60 Not listed 76 CC Chambers
These are crack prone!
SBC Crank Casting Numbers(top)
Casting # Stroke Years
made Main\rod
Journal Size Construction / Notes
1130 3.25 68-73 2.45/2.10 Cast large journal
3815822 3.00 67 2.30/2.00 forged Tuffrided
Special Flange
14088532 3.48 86-88 2.45/2.10 Forged One Piece
rear main seal.
3279 3.00 68-69 2.45/2.10 forged large journal
High Perf.
3814671 3.25 68 2.45/2.10 forged large journal
High Perf.
3729449 3.00 55-67 2.30/2.00 Forged small journal
3941182 3.48 68-76 2.45/2.10 forged large journal
3923279 3.00 68 2.45/2.10 forged large journal
High Perf.
3782680 3.25 62-67 2.30/2.00 Forged Small Journal
3884577 3.25 66-67 2.30/2.20 forged small journal
High Perf.
3911011 3.25 68-69 2.45/2.10 cast large journal
3941178 3.00 68-69 2.45/2.10 Forged large journal
High perf.
3951529 3.75 70-80 2.65/2.10 Cast large journal
Externally Balanced.
3932442 3.48 69-85 2.45/2.10 cast large journal
3892690 3.48 69-85 2.45/2.10 Forged large journal
3941188 3.48 69-71 2.45/2.10 forged large journal
High Perf.
3911001 3.25 68-73 2.45/2.10 cast large journal
39411182 3.48 69-85 2.45/2.10 Forged large journal
354431 3.10 75-76 2.45/2.10 Cast large journal
only found in the 262,
makes good stroker
crank for 283's
Performance Stock Intake Casting Numbers for SBC(top)
Aluminum Intake Manifolds

Part Number

Carb Type

Year

Engine

HP

3917610

4BBL Holley 1967-68 302 290 (Z/28)
3932472

4 BBL Holley 1969 302 290 (Z/28)
3941126

2X4BBL Holley 1968-69 302 290 (Z/28 crossram
bottom half)
3941130

2X4BBL Holley 1968-69 302 290 (Z/28 crossram
top half)
Cast Iron Intake Manifolds

3877652

2BBL (all) 1967 327 210
283 195
3905393

4BBL Rochester 1967 327 275
350 295
3916313

2BBL Rochester 1969 350 250
3919801

2BBL Rochester 1968 327 210
3919803

4BBL Rochester 1968 327 285, 325
350 295
3927183

2BBL Rochester 1969 307 200
327 210
3927184

4BBL Rochester 1969 350
255, 300

Transmission Ratios(top)
TRANSMISSION 1ST 2ND 3RD 4TH 5TH
GM Powerglide 1.82 1.00 n/a n/a n/a

Borg-Warner T-5 (GM Applications) 2.95 1.94 1.34 1.00 0.63
Borg-Warner T-5 (GM Close Ratio) 2.75 1.94 1.34 1.00 0.74

BW Super T-10
Borg-Warner T-10 2nd Design 2.64 1.61 1.23 1.00 n/a
Borg-Warner T-10 2nd Design 2.88 1.74 1.33 1.00 n/a
Borg-Warner T-10 2nd Design 3.44 2.28 1.46 1.00 n/a

GM Muncie (M-21, M-22) 2.20 1.64 1.28 1.00 n/a
GM Muncie (M-20) 2.52 1.88 1.46 1.00 n/a

GM Powerglide 1.76 1.00 n/a n/a n/a

GM Turbo Hydra-Matic 350 2.52 1.52 1.00 n/a n/a
GM Turbo Hydra-Matic 400 2.48 1.48 1.00 n/a n/a
GM Turbo Hydra-Matic 200-R4 2.74 1.57 1.00 0.67 n/a
GM Turbo Hydra-Matic 700-R4 3.06 1.62 1.00 0.70 n/a

Saginaw 3-speed 1st 2nd 3rd
       No Lines (grooves)   2.85 1.68 1.00
       1 Line   2.54 1.50 1.00
       2 Lines 3.11 1.84 1.00
       3 Lines 3.50 1.89 1.00
Saginaw 4-speed 1st 2nd 3rd 4th
        No lines 2.84 2.01 1.35 1.00
        1 Line 2.54 1.80 1.44 1.00
        2 Lines 3.11 2.20 1.47 1.00
        3 Lines 3.50 2.47 1.65 1.00

 
When The Flag Drops,,,



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