CM871 Cam and Injector gear slip

[tree98]

(12-13-2023 )Rsansing Wrote:  Head is aftermarket.

That could be the problem right there!!

The casting could be off by enough to make the cam bind up like hell against the rockers once everything is up to operating temp. If that's the problem your going to end up trashing your cams(if you didn't already)if you keep trying to run it.

Just because it looks like a new cylinder head and everything bolts on doesn't mean the specs and tolerance's are correct, and only God knows what material it's made out of. Even if your problem ends up being something else, I have to tell you I've never heard of an aftermarket head working out on an ISX......... not a single time.