4.6L Performance Improvement (PI) Cylinder Heads Current production 4.6L SOHC 2V Romeo engine aluminum cylinder heads Fully machined and assembled with production Mustang GT valvetrain and camshaft Great for custom engine builds Less expensive that replacing valvetrain and remachining a used cylinder head Less expensive alternative to aftermarket performance heads Can be used on 1996-98 engines with additional modifications and parts 43.9 +/1 1.5cc Raises compression on 1996-98 engines to 10:1
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