Small Block and Big Block Engine Bore and Stroke Chart
Estimated Reading Time: 1 Minutes| Bore & Stroke Chart | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Small Block Engine | |||||||||
| Engine | Years | Bore Diameter | Stroke | Rod Length | Main Bearing Diameter | Rod Bearing Diameter | Main Caps | Journal Size | Notes |
| 262 | 1975-76 | 3.671 | 3.10 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | |
| 265 | 1955-56 | 3.75 | 3.00 | 5.7 | 2.30 | 2.10 | 2-bolt | Small | |
| 265 | 1994 | 3.736 | 3.00 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | |
| 267 | 1979-81 | 3.50 | 3.48 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | |
| 283 | 1957-97 | 3.875 | 3.00 | 5.7 | 2.30 | 2.00 | 2-bolt | Small | |
| 293 | 1999- | 3.780 | 3.27 | 5.7 | 2.30 | 2.10 | 2-bolt | Medium | "LR4" 4.8 Liter Vortec |
| 302 | 1967 | 4.001 | 3.00 | 5.7 | 2.30 | 2.00 | 2-bolt | Small | |
| 302 | 1968-69 | 4.001 | 3.00 | 5.7 | 2.45 | 2.10 | 4-bolt | Medium | |
| 305 | 1986-97 | 3.736 | 3.48 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | 1-piece. |
| 305 | 1976-86 | 3.736 | 3.48 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | 2-piece |
| 307 | 1968-73 | 3.875 | 3.25 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | |
| 325 | 1999- | 3.78 | 3.62 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | "LM7" 5.3 liter Vortec |
| 327 | 1962-67 | 4.001 | 3.25 | 5.7 | 2.30 | 2.00 | 2-bolt | Small | |
| 327 | 1968-69 | 4.001 | 3.25 | 5.7 | 2.45 | 2.10 | 2-bolt | Medium | |
| 350 | 1967-85 | 4.001 | 3.48 | 5.7 | 2.45 | 2.10 | 2/4-bolt | Medium | 2-piece |
| 350 | 1986-95 | 4.001 | 3.48 | 5.7 | 2.45 | 2.10 | 2/4-bolt | Medium | 1-piece. TBI injection |
| 350 | 1996-00 | 4.00 | 3.48 | 5.7 | 2.45 | 2.10 | Medium | Vortec 350 | |
| 350 | 1989-95 | 3.90 | 3.66 | 5.74 | 2.45 | 2.10 | 4-bolt | Medium | "LT5" in ZR1 Corvette 32 Valve DOHC |
| 350 | 1997- | 3.90 | 3.62 | 6.098 | 2.45 | 2.10 | 4-bolt | Medium | Gen 3 " LS1" makes 346 cubic inch |
| 364 | 1999- | 4.00 | 3.62 | 5.7 | 2.45 | 2.10 | 4-bolt | Medium | "LQ4" 6.0 Liter Vortec |
| 377 | 400 Block | 4.155 | 3.4 | 5.7 or 6 | 2.45 | 2.10 | 2/4-bolt | Medium | Must use main bearing spacer. |
| 383 | 350 Block | 4.03 | 3.75 | 5.565, 5.7, or 6 |
2.45 | 2.10 | 2/4-bolt | Medium | 400 mains cut to 350 size |
| 400 | 1970-72 | 4.125 | 3.75 | 5.565 | 2.65 | 2.10 | 4-bolt | Large | |
| 400 | 1973-80 | 4.125 | 3.75 | 5.565 | 2.65 | 2.10 | 2-bolt | Large | |
| Big Block Engine | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Engine | Years | Bore Diameter | Stroke | Rod Length | Main Bearing Diameter | Rod Bearing Diameter | Main Caps | Journal Size | Notes |
| 366T | 1968-90 | 3.935 | 3.76 | 6.135 | 2.7495 2.7488 | 2.20 | 4-bolt | Standard | |
| 396 | 1965-69 | 4.096 | 3.76 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | |
| 402 | 1970-72 | 4.125 | 3.76 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | |
| 427 | 1969-69 | 4.25 | 3.76 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | |
| 427T | 1968-85 | 4.25 | 3.76 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | Tall Deck |
| 454 | 1970-90 | 4.25 | 4 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | |
| 454 | 1990-up | 4.25 | 4 | 6.135 | 2.7495- 2.7488 |
2.20 | 2/4-bolt | Standard | |
| 502 | 1996-up | 4.446 | 4 | 6.135 | 2.7495- 2.7488 |
2.20 | 4-bolt | Standard | |
two combinations were not listed. A 4oo block with a 3" stroke displaces 321 cu. in. and with a 3.25: stroke displaces 348 cu. in. My build has a 0.030" overbore for a bore of 4.155" with a 327 stroke and it displaces 353 cu.inch.