Pulling Cylinder Sleeves and Replacing Them

[Barn Junk]

Originally Posted by Walt Dupont--Me.

To put the Merc 4in. crank in that 39-40-41 -42 engine you'll have to grind about a one inch long slot on the bottom of each cyl so the rod nut will not hit the edge, also aluminum slinger on the rear of the block and the rear cap, will have to be changed to rope seal. Quite a bit of work but will be a snappy little engine. I'm building one right for a guy PA for a 39 4dr rag top, Walt

Is that clearance slot while using 8BA rods? How about using 21A rods, 39-41 floaters and turning the Merc crank rod journals to 2 inch. Is there still a lot of interference? Is there any chance of hitting water with the one inch slot?