Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Help with Vortec Heads...please!!
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Old 06-19-2010, 09:26 PM
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Those numbers are killer for a factory 305 head... roughly 40cfm more on both the intake and exhaust than many other 305 heads, and for the most part, the pre-vortec, 80's and 90's 305 heads were better than a lot of the similar vintage 350 heads.

For that matter a friend of mine spent a few hours just doing some basic clean up with a carbide bur (no sanding or real heavy work), installed some 1.94/1.55 valves... they flowed 260intake, 222exhaust at .500" and made 460hp on a well built 350.
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