Machining Pistons to run 20v head... And FCR's on a 20v?

[jondee86]

Quote:At the time I built this engine no one did decomped 5 valve pistons,
so I bought some Arias forged and then custom flycut the pistons
myself on a mill to suit the ST head, I then blended the valve pockets
so there were no nasty sharp edges, then balanced the whole assembly.

One Aussi did this when building a 20V turbo engine, so I guess it is
possible. Might pay to get an old 16V piston and drill a few holes to see
how much meat there is in the dome where you need to cut... and
measure the valve to piston clearances very carefully.

Cheers... jondee86