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I'm a bit rusty on E-series head tech, but I believe the valves are 1mm larger in diameter on the 15M heads and that has something to do with the necessary valve reliefs on the matching pistons for those heads too.
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'93 SE-R
'89 B12 4WD GA16DET
'86 B11 Euro-Rallycross car
'81 Datsun 210
'77 Datsun B210
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