cool head on 70mm bore?

[twinrock]

heys guys i think i asked this once b4..i have a set of barrels which have been resleaved and are at 69-70mm i want to run a cool head but not sure on the availability of the domes to fit..or is it just a matter of having 68mm domes machined out , id much prefer a bolt on answer..im also running a 4 mm crank with spacer plate..at see level any info on what cc the dome would need to be would also be great thanks

[Ruko]

The Trinity Stage 4 head with thier big bore domes will work for you. I used to have one of thier 420 big bores which was also 70mm bore. The Pro Design only go to 68mm for some reason. I know the Trinity head and domes are shaped different so maybe thats why they can go bigger.