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Alan Roehrich · 07-04-2010, 08:05 PM

The intake will rarely hit so long as the piston to valve clearance is the same as piston to head clearance, or greater. The exhaust is an entirely different deal though. Even at 0.070" or so we see evidence of the exhaust valve touching the piston.

The next thing you could look at for your combination is a set of 4-2-1 stepped headers. With a really good set, you can use a smaller exhaust lobe, as much as 6 degrees less duration.

07-04-2010, 08:05 PM	#11
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,123 Likes: 1,580 Liked 1,872 Times in 422 Posts	Re: cam timing ? The intake will rarely hit so long as the piston to valve clearance is the same as piston to head clearance, or greater. The exhaust is an entirely different deal though. Even at 0.070" or so we see evidence of the exhaust valve touching the piston. The next thing you could look at for your combination is a set of 4-2-1 stepped headers. With a really good set, you can use a smaller exhaust lobe, as much as 6 degrees less duration. __________________ Alan Roehrich 212A G/S