Need 250 I6 info:

[66Submarine]

Originally Posted by Dillon Rock

Also, the heads on 292's aren't interchangeable on the smaller blocks due to a higher deck on the big ol' 292's.

No, the heads are the same. 292's came with rotators on the exhaust valves, but the head was otherwise the same. (Some will put 194 heads on 292's for extra compression.)

[TJ's Chevy]

They actually are because I have seen a 194 head on a 292.

[TJ's Chevy]

292 has 3.875 bore and 4.120 stoke, 250 has 3.875 bore and 3.530 stroke, and the 230 has a 3.875 bore and a 3.250 stoke. Basically the 250 is a stroked 230, and the 292 would be a majorly stroked out 230 if they were the same block. The Gmc 302 has a 4 in bore and 4 in stroke, and 7 inch connecting rods! Making it the tallest deck 6 cylinder on the gm line!