V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Cam walks - thrust control?

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Old Jan 31, 2011 | 12:45 PM
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fyrebird68's Avatar
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Cam walks - thrust control?

I have a 3.4 V6 but I think this would apply to all PR V6's.

What keeps the cam in a pushrod V6 from moving front-to-back? I think the occasional noise I hear is the cam bumping into the block.

New Cloyes timing set reduced the amount of motion but there is still some.

On most motors I have seen in the past there was a thrust washer or clip to control this movement. I don't see anything to prevent this motion on the cam.

Also, is there a timing chain guide available for Cloyes set that will fit the 3.4 block?
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Old Jan 31, 2011 | 04:08 PM
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Re: Cam walks - thrust control?

On a flat tappet motor the tappets themselves retain the cam. The tappet base and cam face are slightly convex to make the tappets spin as the motor runs and to keep the cam inplace. Roller cams have a thrust washer/plate. No direct fit 3.4 guides as far as I have seen, grind the dowel off a 2.8 guide.
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