With om 603 crank u will need shorter rods, low compression height pistons with really short skirt. Just short rods stock piston will hit the crank and is still over deck way too much. M111 piston and rod combo might work but i havent tested yet. Problably u will need to bore block too, i dont remember if m111 had same bore version. Short rod was i think in 2.0 and 2.3 versions.
Boost is the way to go.
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