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

[PazzaAE86]

Anyone up on this?

I might be running a 20v head on my 16v, is pocketing a high comp 16v forged piston to take the 5th valve something that can be done?

Also, anyone ran FCR's on a 20v head? This head has no VVti to worry about, so my current FCR's should theoretically go on with a new inlet manifold and a Dizzy relocation kit.. Right?

Ta!

[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