Vavle stem height....

Thanks! That helps. I'll check out the actual varience when i get a chance.

as far as the difference from one cyl to another - I understand what you're talking about and agree - that's why I was concerned. Although, only the exhausts have the hardened seats, and it's the exhaust valves that are the culprit. So, as long as they are consistently off from cyl to cly, there shouldn't be that much diffenece from one cly to another (I'm guessing).

The engine ran great in the Ramcharger, so I think I'll just take some measurements and as long as it's not too far off, make up the difference with the adjustable rockers.

I guess I can always look at it as a slight bump in compression since the valve sits lower into the combusion chamber, right?:-D