My 261 is roughly 33" and my GMC 302 (same as 270) about an inch longer. This is from the back of the head to where the fan bolts on to the water pump shaft; both are standard water pumps. The GMC is bulkier in the timing cover area and the actual block is almost 2" longer than a 235. I don't know whether your existing bellhousing will work with these engines though - what car is this for?
