Pistons protruding

[christenlin]

Many thanks for your thoughts gents, I probably should have mentioned that it is dry assembled and without any base gasket at the moment.  I must say I hadn't expected base gaskets to be as thick as 17 or 27 thou.  So I guess when compressed even the thin one would probably bring my pistons down to deck height, which would leave the head gasket thickness as clearance on No.s 1&4 and I could reduce 2&3 by a small amount if I feel it necessary.