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- Performer RPM FE heads are direct bolt-on components for 1961-76
390-427-428 Fords. Heads include stainless steel, one-piece, swirl-polished,
hardened tip 2.09" intake and 1.66" exhaust valves. These 428
Cobra Jet-sized valves promote excellent flow for streetable power and will
clear 4.050" bores on 390 engines.
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