ram

iTrader: (4)

Hi guys

on the look out for a new 4x4 cylinder head. looking at a few used ones but need to know the bare minimum i should accept for height? been told original factory height was just over 139. Norris motorsport site says not to use less than 138.63.
I do however have 4x4 male pistons with cut outs and a tiny skim off the top..

so with my set up what you guys reckon?

Cheers

focus2351

iTrader: (1)

i am interested too

boostn_capri

Hey mate,
Try this link....,

http://bbs.rsownersclub.co.uk/showth...head+thickness
They basically say:

The thickness (from block gasket face to top of head where rocker cover face is) should be:
-139.2 new
-137.6 is a point at which you are run a risk of valve seats clashing as there's so little material left around them. Manufacturers minimum recommended thickness is 138.68mm
-On the forums there is other people running*138.3mm but all accept there's a risk involved. anything beyond that and the head either should be used for a N/A application or discarded

ram

iTrader: (4)

Thanks for the info.

i took the risk of running an over skimmed head for the past year and its dropped a valve seat and written a piston off. wanted to make sure i didn't make that mistake again!
Cost me a lot but Just bought an unskimmed 4x4 head for peace of mind

Just need to source a single 4x4 mahle piston with cut outs then I'm good to build it back up.