Originally Posted by econnor
Yes. Your cases will need to be bored to fit the larger cylinders. Stock Evo bore is 3 1/2" the 88" Evo has 3 5/8" bore. This used to be a very common modification.
Depending on which pistons are run, the engine height may decrease some.
Stock Evo cylinders have a length of 5.550". Cylinders and pistons from S&S for an 88 Evo are like 3.350". Not much but certainly not taller.
Will fit just fine in your frame.
econnor, maybe you can help me out then. I had this mod done three years ago and the bike (97 RK), has not run since. My cases were bored and I was given an S&S Sidewinder kit to reassemble the engine with. You are already aware the cylinders are -.175 shorter than stock.
The problem is the top motor mount will no longer reach the heads. I cannot locate any aftermarket mounts. Additionally the exhaust doesn't line up as well, especially under the transmission. Pushrod clips don't fit anymore either. Any help to get back on the road would be greatly appreciated.
P.S. MOM2KIDS01, I have had many conversations with Axtell, and was thinking of buying their kit because it is stock length. However the cylinders are made of cast iron and therefore the fins cannot be polished as they will rust almost instantly. If you have polished fins on your heads like I have you might want to consider this before purchase.