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We often put a 2.200 11/32 intake and a 1.71 11/32 exhaust into Edelbrock heads. The intake clears everything on a 4.080 bore with no problems. The exhaust gets tight on 390s - you're best keeping that smaller - we do 1.660 on those.
Between the bigger valve, smaller stem, Newen CNC valve job, and some modest blending we see about a 30 cfm average gain in the working ranges from .400 to .600 lift. This is without significantly modifiying the port opening at all.
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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