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I have a set of k20 R int and ext cams, does anyone know the valve clearance specs, or are they the same as stock k20a2? Is there much difference in the k20 R cams? and i also have K20 R manifold is there much difference in that? i hear they have a bigger plenum. Any help appreciated.
 

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The k20a cams are slightly more aggressive than the a2 cams.You will see a few whp gain.Im not exactly sure about the manifold though.

Here's the valve lash specs for a k20a2,which should be pretty close.

COLD

Intake= .008-.010"
Exhaust= .010-.011"
 

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