Re: L pistons and rings and other parts
Old man Gravely did, in fact, use a piston that was in production at the time. The problem is he picked an engine that wasn't made for very long before the company got bought and the new owners merged that engine into their line of engines, changing the compression height at the same time.
For a while, aftermarket piston companies made these pistons and they were purchased by people who owned the original engines. With the advent of the 1950's, though, the number of people buying the pistons dwindled, and Gravely ended up being the only ones buying them. At some point, therefore, they changed the ring setup from 4 to the now familiar 3.
The ones being sold at gtgravelyparts.com match the Gravely piston in all critical dimensions, including the size and depth of the ring grooves, compression height, and diameter. There are only two differences - the location of the oil ring, which was the result of the casting used but doesn't affect performance, and the thickness of the skirt, which actually adds strength to the piston where they have a tendency to crack.
Todd W. White
Lots and lots of Gravely's