Chevy SB piston dia quick reference

Unknown

262 = 3.671" x 3.10" (Gen. I, 5.7" rod)

265 = 3.750" x 3.00" ('55-'57 Gen.I, 5.7" rod)

265 = 3.750" x 3.00" ('94-'96 Gen.II, 4.3 liter V-8 "L99", 5.94" rod)

267 = 3.500" x 3.48" (Gen.I, 5.7" rod)

283 = 3.875" x 3.00" (Gen.I, 5.7" rod)

293 = 3.779" x 3.27" ('99-later, Gen.III, "LR4" 4.8 Liter Vortec, 6.278" rod)

302 = 4.000" x 3.00" (Gen.I, 5.7" rod)

305 = 3.740" x 3.48" (Gen.I, 5.7" rod)

307 = 3.875" x 3.25" (Gen.I, 5.7" rod)

325 = 3.779" x 3.622" ('99-later, Gen.III, "LM7", "LS4 front wheel drive V-8" 5.3 Liter Vortec, 6.098" rod)

327 = 4.000" x 3.25" (Gen.I, 5.7" rod)

345 = 3.893" x 3.622" ('97-later, Gen.III, "LS1", 6.098" rod)

350 = 4.000" x 3.48" (Gen.I, 5.7" rod)

350 = 4.000" x 3.48" ('96-'01, Gen. I, Vortec, 5.7" rod)

350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod)

364 = 4.000" x 3.622" ('99-later, Gen.III, "LS2", "LQ4" 6.0 Liter Vortec, 6.098" rod)

383 = 4.000" x 3.80" ('00, "HT 383", Gen.I truck crate motor, 5.7" rod)

400 = 4.125" x 3.75" (Gen.I, 5.565" rod)

427 = 4.125" x 4.00" (2006 Gen.IV, LS7 SBC, titanium rods)





Two common, non-factory smallblock combinations:



377 = 4.155" x 3.48" (5.7" or 6.00" rod) 400 block and a 350 crank with "spacer" main bearings 383 = 4.030" x 3.75" (5.565" or 5.7" or 6.0" rod) 350 block and a 400 crank, main bearing crank journals cut to 350 size