[Woodz428]

Cracker,
You can take the exhaust rockers off and get a compression test, and probably a little bit if you pull just the intake rockers off. But if you take them both off you won't get any noticeable compression because it isn't taking anything in to compress. You could back them off some, but removing them would be fruitless. I also prefer a leakdown test over a compression test, it's more accurate and can help pinpoint problems right away.