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GM Block Casting Numbers |
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| Older blocks with 010 markings are a better
quality of metal. When picking a block pay close attention to the front camshaft hole. Look for the hole to be centered in the block casting. Try to avoid blocks where the hole is offset to one side. |
| Casting # | Year | Size | HP | 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. |