Building an inline 6 Chevy 250 engine

The Chevy inline 6 has been around in one version or another since 1929 until 1990 in North America-market vehicles. During the fall of 1961, a modernized version of the six was introduced (with the Chevy II) which has 7 main bearings and a short deck displacing 194 cid - the rear block face was redesigned with a bellhousing pattern which matched the Chevrolet V8s in production (both the small block and W-series) - transmission bellhousings for the V8 (both manual and automatic) were shared. The Chevy straight 6 250 cid engine was brought out in 1966. It has a 0.280" longer stroke (3.53") and the same bore (3.875") as the 230 cid straight 6. It boasts a 7 main bearing bottom end- quite an improvement over the previous generation inline's 4 main bearings. Although production ceased in 1990 for automotive use, the inline six was produced overseas in Latin America for Brasilian-market GM products until the 2001 model year. 250 production ended in 1984 but the 292 tall deck motor remained in production where it was manufactured in Mexico until 2001.