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Old 04-12-2008, 09:40 PM
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Cam button length/clearance..?

I got around to installing my cam today in my sbc 383, and ran into a problem. I purchased a cam button from summit with a length of .795". I installed the timing chain cover, then the cam button, and then proceeded to check the endplay. I stuck a flathead and gently pushed the cam to the rear of the block, then pushed it until it touched the cover. It seemed waaaay too big of a clearance. I took off the cover, then the cam gear, and measured the distance it came out of the hole. It was around .1875"! That, added onto the current cam button length, and with the recommended clearance factored in, gave me around .9775" for a new cam button length. I don't have a welder, so I can't modify the cover itself by adding spacers, and the largest cam button that I have found is about .950 ". What can I do to be within specs? I'm all for getting a new cam button, but I want to get the right size.

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Old 04-12-2008, 10:17 PM
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Get the 0.950" button and trial fit it for 0.005"-0.008" clearance. If you have more than you need, lay the timing cover down on a short piece of 2" tubing or old socket with the socket centered at the cam. Now take a punch that is the diameter of the spacer small end or an old socket that size and give the cover a whack with a BFH. If using a punch, chamfer the edges of it so you don't cut the metal of the cover. This is a cut and try process, but it works to move the metal back toward the motor a little to get the proper clearance.
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