How many cc in my pistons?

[Morrisminormo]

I have been offered a 206 head for my 948cc. The cc in a 206 head is 28.3. but do I need to no what cc s in the pistons to work out how much I need skimming ?? It is not unleaded so will have to get the valve seats done also.

Cheers

[bmcecosse]

The 206 head is relatively rare........you would need to skim it 80 thou (maybe 100 thou if you dare..) to get a worthwhile comp ratio (but before doing that - the oil passage depth must be checked) .....and don't waste money on unleaded seats...... The 940 head is a MUCH better proposition - as you have been told many times now.......

[Morrisminormo]

I think really wanted a 'bolt on head' the 12g940 is the best but pocketing the block sounds daunting to me

[bmcecosse]

DO NOT pocket the block!!