Originally posted by Mimosa Stag
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Also the front end changed and with it the type of oil pump. In the earlier engines the oil pump is driven off the bottom of the distributor drive, and on later engines (referred to as serpentine) the oil pump is driven off concentric gears driven directly by the crankshaft. If you are adjusting the timing on the former type, take care if running the engine with a loose distributor, it can lift up off the pump drive rod disconnecting the drive. only slacken the distributor clamp bolt enough to get slight movement and make sure the engine vibrations don't slacken off the clamp without you knowing. Oil pressure on a good RV8 is generally 40-50 psi with hot tickover at 20psi.
Rgds
John
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