Big Bore Piston Question.

[thespud]

Hey all,

My question is, how hard are big bore (81.5-82.0mm) High compression clynders (10.5:1) to source? I am askingthis because i have possibly decided to scrap my past plans to twin charge my 20v and build it up as a N/A monster.

I have been able to find a workshop that will bore for $50 per cylinder and port & polish for $200... so it looks like i may go with this option if i can source the pistons. I have also been able to source 82.0mm rings for this aplication too.

My other Question, how hard are more agressive cams for the 20v to source?

Thanks in advance.

Scott.

[Toobs]

4AG is normally 81mm bore x 77mm stroke.

Shouldn't be a problem getting higher compression overbore forgies for the 4AG 20V seeing as they are used in the clubmans etc.
Check out a few of the larger forged piston manufactures sites and I'm sure you find something (e.g. Ross, Venolia, Arias etc.)

Re camshafts I'm sure Toda do a few 20V cams and Wade cams will probably do a few if you give them a call.