[Dave at Pelican Parts]

Ron, the 96es are "slip-ins" on the Type IV. No machining required, unless you are using the thick-walled 96es on a 1.7 engine. In which case you have to have the heads machined, not the case. (There are thin-walled 96es that slip into 1.7 heads with no machining, but they're really very thin!)

--DD