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Bored&Stroked · 11-02-2020, 05:50 PM

FYI: As a side note, there are TWO different Jahn's piston domes - the one on the 3 ring "racing pistons" used a consistent radius, the one on the 4-ring stock-style pistons used a multi-ellipse pattern - essentially two different elliptical profiles on the same dome.

There are a variety of different piston crown/dome styles - some with a consistent radius, some with the multi-elliptical radius. I've seen different chamber/dome shapes on various Navarro heads over the years (original sets) - but I have no idea as to what H&H is doing these days.

11-02-2020, 05:50 PM	#10
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,067	Re: Piston to Head Clearance Input FYI: As a side note, there are TWO different Jahn's piston domes - the one on the 3 ring "racing pistons" used a consistent radius, the one on the 4-ring stock-style pistons used a multi-ellipse pattern - essentially two different elliptical profiles on the same dome. There are a variety of different piston crown/dome styles - some with a consistent radius, some with the multi-elliptical radius. I've seen different chamber/dome shapes on various Navarro heads over the years (original sets) - but I have no idea as to what H&H is doing these days.