Reply To: NELSON BOHNALITE.

[Jim Chase]

Yes, the steel strut is actually invar which is an expensive alloy that has the unusual quality of having zero expansion with temperature that keeps the aluminum the piston from growing in the bore when it gets hot – needed to allow the really tight piston clearance. It also was tin plated as an anti-seizure measure. they are more sophisticated than the lumps of aluminum you might get aftermarket.

Jim