Peter its not a hard task to decompress an engine for forced induction. It can
be done by changing the piston crown height with another set of pistons or
fitting
decompression plates between either the head and barrels or between the barrel
and core (the later being a better option) at the required thickness and
the job is done. It comes back to how many biscuits you have in the cupboard.
Compression ratio is paired with max boost; in short a lower compression ratio
allows for a higher boost pressure without detonating the engine apart. There's
a formula for determining all this prior to committing to a build.
Pistons can often be remachined for purpose or produced from a stock blank
forging;
often there is enough meat on the piston crown to safely machine off but
it depends on the individual piston, the rings need to remain a nominal distance
---From the open bore.
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http://forums.matronics.com/viewtopic.php?p=508743#508743
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