Hello. I've just bought a new Omega diecast piston for a Comet from Vincent Spares Co. The fitting instruction advise a piston to bore clearance of 2.5 - 3 thou. This seems quite a small clearance to me, but I appreciate that different pistons have different expansion rates. I would therefore like to know if others have fitted these pistons and what their experience of them is.
Many thanks, Ian
Many thanks, Ian