My brothers car has a set of TFS T/W heads on it. They are the pedestal mount type. When we first put them on(1995) we used the stock length pushrods.(6.272) We used ford motorsport 1.73 rocker arms with a B303 cam. The car ran fine and we had NO valve train problems.(40,000+ miles including weekly racing). We then changed cams to a stage one TFS cam, and that's where the problems startThe rocker arms started moving left or right and coming off the valve tip. We then found out that you have to use longer than stock pushrods.(at least 6.500 according to TFS) Ok, next problem... With any thing longer than 6.300 the valve begins to open as we tighten down the rocker arm boltYes we have the lifter on the base of the cam lobe, we tried this several times on every cylinderSo what gives? any ideas? Do I need a special lifter to use with the adj. pushrod? Neither the heads or the block have been machined. I tried calling TFS, but their phone monkey gave me the run around(he had no idea!!!) Thanks guys!