[KTL]

Yep I just installed the #8 bearing to recheck and the bores were better aligned.

The standard size gauge like Tom linked is good for the first four mains, starting from the flywheel end. After that you can't reach the next three because #8 bearing is in place, if you were to measure from that side. That's what prompted me to ask the question. The 20 in. gauge like aws mentioned is the hot ticket. Or else buy a small head dial indicator to go on the standard gauge body.

That Eastwood dial bore gauge looks a lot like the Fowler brand gauge I have. Decent quality for the occasional use like us DIY guys. Plus the price that Eastwood has is VERY good.

I highly recommend anyone building an engine to get a bore gauge and some decent micrometers. They don't cost a ton of money and they let you pre-check and post-check your parts before and after machining. If you're willing to spend some good money on some of the Porsche specialty tools (cam holder, engine stand adapter, etc.) then don't skimp out and avoid buying (or borrowing) some more tools that REALLY help you with your engine build. My bore gauge is fantastic for measuring the cylinders, case mains & spigots, and conrod big ends.