Posted by Dave Jensen on Wednesday, July 09, 2003 at 8:36PM :
In Reply to: 25" six posted by Craig M on Wednesday, July 09, 2003 at 2:18AM :
Hate to parade my ignorance, but here goes: Measuring the head length (from outside edges of the outer-most headbolts), the 230-family is 23" long, and the 251-family is 25" long. I've only had one early engine (217? 218?)and that was a bad motor in a WC I replaced with a 230, since then I've only run 230s and 251s. My '46 1 ton and 46 and 48 1 1/2 ton trucks all have the longer 251 engine.