Pro Marine pistons

[Baker343]

As I have learned, make sure your favorite piston manufacture (China) makes a piston that fits your hurt holes.
0.20's can limit your choices

[Chaz]

Good info guys.
I have a few questions?
Wonder what company makes WSM, same as the Pro?

Vertex cost very close to Pro or WSM?
Vertex is always my first choice for my application....just my 2 cents.

Could it be .. because they are made in Cadelbosco Sopra Italy ..

Does the 1.5 to 2.0 make a major difference in a non racing or high strung application?

Using a 3.2L crank as an example .. 7000 RPM puts the piston speed @ aprox. 3600 ft/min . ( over the somewhat antiquated thought of 3500 ft/min max )

Potential ring flutter for a 2mm ring is 6000 RPM (again taken with a grain of salt)

A 1.5 mm ring should go an additional 900 RPM , before potentially losing control ..