Thanks .
was thinking the expansion might be trouble .
As theyre both scrap , I may well ' see what happens ' , as the cold fit is just about right .
Either that or see if castor will ' lacquer up ' the piston to a good fit in the std. liner . Sounds like carrying the optimism a bit far tho .
Reading Peter Chinn stuff on OS's ( Specifically the FSR 21 Car Engine , this ' nickle cooating ' is ACTUALLY ' Nickasil ' .
Where its silicon impregnated nickle , so very hard - but only about three microns thick .
As it has a good ? reputation in automobiles & motorcycles , Mercedes even use it now , good air filtration seem like a requirement ,
as airbourne dust would be abbrasive , that and wrong / inadequate oil seem to be the problem , rather than the liner itself.
Though CHOME is much deeper ( thicker ) and more tolerant of other inadequacies . So generally more durable .
Sounds like if youve a good A B N engine , the flitered intake is likely a prerequisite , if its dry'n dusty at the flying site .
Of Course , if anyones got a good / new FSR 40 Magnum Piston , . . . . lemme know , please .