It's all about scale

[JimZaremski]

On the left, the single piston from a Picco .65 marine engine from an old 1/8 scale Unlimited. On the right, one of the 12 pistons of an Allison V-1710 from a 1/1 scale Unlimited

 

[eric stockon]

ummm, Jim i don't think the Allison pistons gonna fit the in the picco ...........

 

[Roy Munoz]

Nice