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Originally Posted by SVXMAN2001
I am having the cylinder head of my eg33 cleaned up with a mild port and polish and was considering having the guy install a set of higher performance intake/exhaust valves and springs.
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If you are going for a mild build, then the stock valve diameters are
fine. The bone-stock head castings and valves flow enough air for 420+ hp. The restrictions are elsewhere in this engine.
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I could be asking this competely wrong, meaning, I cannot consider what size intake/exhaust valves to get without knowing what sort of cam gears I'll be running, but I thought it i'd ask anyway as I am still a newbie when it comes to this...thanks. chris
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As far as I know, there are no aftermarket options for cam gears out there. Only stock.
As far as cams, Delta and Web Cams both have lots of Subaru experience. Shoot for maximum valve lift (as much as the stock springs will allow), and target more exhaust duration than intake duration. This wakes up the lazy exhaust ports a bit.