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Old 12-09-2009, 10:19 PM
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olds 4a heads

Can the olds 403 heads be ported to flow numbers that will support 500 hp? Is it true that the stock 4a heads intake flow more than the c heads and its the exhaust that really chokes the 4a heads? I would be installing 2.075 int valves and 1.710 exh valves.

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Old 12-19-2009, 11:08 PM
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Try this web pagehttp://www.mondellotwister.com/ArtUnsungH.htm

Dale
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