Hi Nixon_2wd...thanks for the reply. I've spoken with a few people today about this and I am getting ( as per f-ing usual ) a mixed bag of responses.

I was 100% assured that the clearance from the pistons is enough to install a big cam at a later date......

The new pistons are flat top and 4MM DOWN from the bore top. I was told this is the same as a normal full size piston at the bore top with valve cut-outs machined into them. Essentially the flat top of the piston is the same height as the BOTTOM of a valve cut-out so there shouldn't be an issue. This is the argument FOR.

The argument AGAINST is simply agreeing with yourself, saying that the pistons are too high for bigger cam clearance.

I hope I described it clearly enough for you.

Can you shed any light on the subject now with this extra information.......or can anybody???

I want to future proof the car for 500+bhp so hope I won't have to strip the bi-otch again.

All suggestions and/or advice is welcome.

Cheers lads

Philip