SBC Block Casting Numbers
| 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
| 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
| 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
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
| 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 |
| 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 |