[Mr_S]

Is there an easy way to identify what type of head is fitted to an engine?

I've got a set of low mileage 2002 heads that cost me less than the price of a pair of rockers, and I want to know how to check if they're S or R heads?

I know they're not E's as they don't have the "step".

But

are the stamp marks on the top significant?

Do I whip out the vernier and measure the valves?

Can I check the cam without taking it out???

Cheers

Jason