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Originally Posted by Chaplin
30 over may be enough clearance for the big valves. For a std 428 bore it is in fact true, trust me.
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I believe Edelbrock heads have had the valves moved within the chamber as compared to factory heads. The relocated valves allow for the larger valve sizes within the smaller bore FE's.
Here's an article about getting 450HP from a 390. I would think that with 460 cubic inches you could break the 500HP barrier easily.
HOTROD Magazine FE buildup