Arouse the DAMPFHAMMER!
One of the nicest K-series crank drives is the 90x90.7 engine. Beats every 87x99, which revvs to the same piston pin load. For a serious built 9500 rpm aren't a problem with the F22C crank. The only issue is the sealing of the head gasket. The sleeves need to be set with some decking, to give seating and sealing enough play to work. But on the 90 bore you can use amazing port design parameters. It is an very expensive short block approach and fits to almost no racing series, therefore it is very rare regarding experience. In a K24 block it would have still rod-stroke ratio of at least 1.72, which is more then the OEM K20 has. The 300 whp borderline falls relatively easy compared to 99 mm stroke engines.I believe he was saying the 87mm piston weighs a bit more than the 86, but not enough to cause valve float. If I read that correctly. I had asked if using an 87x86 platform would hurt the rpm capability on the k20. Even 88 bore would be pretty cool, anything to get the tq up but still Rev 9k +