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JE Pistons require the Block to be Sleeved. Metal Compatibility. I'd spend the extra and go with those I linked. Or you could drop $1800 for Overbore to 3.2L-3.4 then sleeve. Sleeved would work with JE Pistons. But then, Custom Rings and Gasket.
Lindsey can Port and Flow /re-work the head and can offer some good advise there.
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles
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