The one write-up was pretty interesting.......plug the valve guides and "refit" the larger valves at a new spacing(!) and relieving the block (after lowering the top ring). The external water passsage set-up is definitely interesting....someone's thinking cap was set on "kill" for this toy....
Pretty foxy stuff for the average enthusiast.........and apparently way unexpected by the boys with the little plastic GM cars - I love it!
Steve Metzger Tucson, Arizona