@ Some BMWs use a metal shim to reduce the compression. If you don't have the metal shim, then I think you're simply seeing gaskets from different manufacturers.

@ Drastic changes in the compression ratio may also call for carb jetting changes, as well as the concerns you mention. After several miles, taking some plug readings would be a good thing to do.

@ I highly advise replacing the 4 black rubber boots on the push rod tubes at the same time. It's very cheap insurance. Those may already come in your kit.

Hope these ideas help.

Thanks for the input. You are correct, what I was talking about are indeed metal shims, though BMW calls them gaskets. I have replacement pushrod gaskets as well. Per Snowbum's tech articles, the ones currently on the engine are the 2.1mm (.047in) shims meant to lower compression. The ones provided by Bob's BMW are the .5mm (.020in) apparently the stock replacemnt. I like the idea of uping compression, and therefore, performance, but don't want to sacrifice reliability.

Goz

There's a reason AT&T makes more money than ladies with crystal balls. Asking is always better than guessing. I'd call Bob's and ask what they were thinking. They pride themselves on this type service and each sales guy has a phone number and email. They may be thinking of placing a paper gasket either side of the thin metal shim for better sealing, which would add up to the same height as the OEM stack. ????

I don't think shims alone are going to turn the R60 into a road burner. So I wouldn't wander too far from home.

The biggest lesson I can pass on to you is to take your time and do it right in one shot.