[Ron Earp]

Hi Russel,

My buddy races one of these here in the US and we have done quite a bit of work on it. Once when the engine was rebuilt we couldn't get the proper preload on the lifters. We made some shims to raise the rocker arm tower and not push the lifter plunger down too much. Shims must have the oiling hole in them too so everything gets lubricated, so be aware of that.

Measuring preload wasn't that easy but eventually we found a piece of wire that was the thickness of the preload we wanted and used that for a gauge. After a few tries we were good to go. Engine worked great.

If you could use adjustable rockers that would be the way to go. We could not due to class rules, but either method can work to get it adjusted correctly.

R