Yeah don't forget there are other (comparatively cheaper) ways to achieve higher comp, like flat top valves (diesel), skinny head gaskets and head machining. The off the shelf head gaskets range from 1mm to 1.15. So if you get a hold of a 0.6 or the like you're doing well in increasing compression ratio.
When I was doing those copper head gaskets the 0.7mm thickness were on the cards, but I couldn't get enough numbers together.
Other wise go a A12 with A10 flat-tops which are available in O/S. Or stroked A12 with A10 flat-tops, now that is a budget build with good power.
The A15 had the big dish pistons didn't it? I have a few used sets of the the shallow dished A14 ones that will fit. If you are interested.
Transfer
