It's bound to be considerable, but until I can log some dyno time, anything I come up with would be a SWAG at best. I can do the same thing with a 235 block, but it would require about 1/8" to be milled off the top of the block to get the piston deck height right. The 216 is shorter, and there's the added advantage of having a "Sneaky Pete" engine that can be made to appear just like a 216 from the outside. The counterweights would still have to be turned down, regardless of which block I start with.
Jerry
