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Old 05-08-2012, 09:43 PM
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Roller cam endplay question

Hi, looking for some info regarding retro-fit roller cams. This is my first build using a roller cam in an early small block chevy and I have a couple uncertainties. I have placed the camshaft in the block to measure the lift on the lobes. The rear cam plug is in and the timing set is still off, just the cam pushed all the way in (until it contacts the rear cam plug I'm assuming?). The problem I am running in to is that the camshaft is WAYYYY too far in the block - the lifters do not line up with the lobes. The lobes appear to be about 3/16" too deep in the block, so far back from the lifter infact that 2 lobes contact one lifter! Now I know that a cam button will control forward play of the camshaft as it contacts the timing cover but what controls rearward endplay? Is the cam supposed to contact the rear cam plug and the depth of the cam plug controls rearward cam travel? Or does the back of the timing gear act as a thrust surface against the block and control rearward cam travel? Like I said right now with the cam pushed all the way in the lobes are sitting about 3/16" too far off center of the lifter bores, to the rear. Any info here is appreciated.

Thanks,
Keith

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Old 05-09-2012, 01:34 AM
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Get a timing set with a thrust bearing on it. That will set the depth into the block the cam will go. You may have to machine the front of the cam bore to set the absolute depth, if the timing set with the trust bearing isn't right for your liking. Then use a thrust button with a heavy duty timing cover to set the total end play.

Keith
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Old 05-09-2012, 02:46 AM
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Quote:
Originally Posted by 383SBC
Hi, looking for some info regarding retro-fit roller cams. This is my first build using a roller cam in an early small block chevy and I have a couple uncertainties. I have placed the camshaft in the block to measure the lift on the lobes. The rear cam plug is in and the timing set is still off, just the cam pushed all the way in (until it contacts the rear cam plug I'm assuming?). The problem I am running in to is that the camshaft is WAYYYY too far in the block - the lifters do not line up with the lobes. The lobes appear to be about 3/16" too deep in the block, so far back from the lifter infact that 2 lobes contact one lifter! Now I know that a cam button will control forward play of the camshaft as it contacts the timing cover but what controls rearward endplay? Is the cam supposed to contact the rear cam plug and the depth of the cam plug controls rearward cam travel? Or does the back of the timing gear act as a thrust surface against the block and control rearward cam travel? Like I said right now with the cam pushed all the way in the lobes are sitting about 3/16" too far off center of the lifter bores, to the rear. Any info here is appreciated.

Thanks,
Keith
The back of the timing gear sets the cam's depth (it contacts the thrust surface of the block) so if you're checking the cam in the block w/the front of the cam pushed up inside the engine, you're not seeing what the position of the lobes will be like w/the timing gear on the cam.

Also, the lifters don't always ride exactly centered on the lobe. A recent thread on this is here.
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Old 05-09-2012, 04:27 AM
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The big rear plug behind the cam only goes in enough to be fully in the block...it should be nowhere near touching the camshaft. It is just there to plug the big hole in the block.
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