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Originally Posted by Jac Mac
Think the 427 valve sizes are based on larger guide center distance & Edelbrock market a head so machined seperately with the 4.25" plus bore in mind.
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From the JEGS catalog:
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Complete heads include stainless steel 2.09'' intake and 1.66'' exhaust valves to clear the 4.050'' bores on a 390ci engines. These 428 Cobra Jet-sized valves promote excellent flow for streetable power, and the large valve seat inserts can be machined to accept 427 Ford Medium Riser valves (2.19''/1.73'') if desired.
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Maybe it's just garbled catalog info, but that sounds like these heads can be re-machined for the larger valves.
Just one thing I'm considering in an engine warm-over. (Roller cam, some head work, maybe these larger valves.) The project will all be in Tom Lucas's hands over at FE Specialties, when I get over to talk with him.