[asphaltgambler]

Yeah, the 60ft times are awfull, like 1.8 But the engine is a long-stroke, low rpm (6500) stump puller so it's really set up to run out in the 1/4.

Back then the only way to significantly increase displacement was to stroke it. The bore on this build went from 3" to 3.5" by way of one-off pair of steel finned cylinders

In order to make them fit you had to bolt and torque the OE bare cases, remove the studs and then TIG weld the entire deck surface area including filling the stud holes to add material. You could only weld so much at a time to avoid warping the cases.

After you had enough welded deck material built up and out you milled the deck surface to the appropriate height and located new studholes. Before final machining and dress you heated the cases up in an oven @250 for 2hrs and then let it cool naturally. After cooling you check for any changes in the cases. This was to 'season' them. I had $2500.00 in just this process in 1991 dollars!!