216 tappets while running

[motto]

There is no oil loss normally. The engine speed is to low to cause splash and the raised ridge around the outside edge that the gasket sits on stops it flowing anywhere but down the push rod holes.

There is no difficulty in feeling the amount of drag on the gauge and with two of you working the job is done quite quickly unlike doing one then rotating to another each time.

The figures I gave came from a manual for a 1-1/2 ton truck so take your pick.Err in favour of bigger rather than smaller gaps as these engines are a little prone to burning valves.

David