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Old 03-12-2008, 06:02 PM
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hydralic roller cam conversion

I understand that the roller cam has the button on the timing cover to control endplay at the front , What controls endplay at the rear ?

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Old 03-12-2008, 06:08 PM
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The back of the block.
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Old 03-12-2008, 06:11 PM
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You actually need a wear plate between the timing gear and block, so the block doesn't get ground up...
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Old 03-12-2008, 07:28 PM
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The cam button goes on the front end of the cam gear. It is retained by the Cam gear bolt locking plate. The stock front timing cover may need a reinforcing plate added to it. Some aftermarket timing covers are reinforced where the cam button would contact it for this purpose.
The running clearance between the cam buttom and timing cover needs to be checked and adjusted if nessessary. .015" +/- is about right.
A thrust washer or roller thrust bearing is used between the back of the cam gear and front of the engine block to limit rearward cam walk. the front cam/lifter bore oil gallery plug bosses may need clearancing to clear the cam timing gear also.
If the fore/aft orientation of the camshaft in the block is is forced out of the sweet spot by the cam gear thrust washer and or the cam buttom/ timing cover, the distributor gear on both the camshaft and distributor will wear faster than it should. Machining the back of the camshaft timing gear may be necessary to set the fore/aft camshaft position in the block and cam walk tolerance. Something to check if you want max life out of your camshaft and distributor gear and accurate, stable spark timing.
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Old 03-12-2008, 07:46 PM
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Yes a wear plate, or a timing set wth a torrington bearing on the back of the cam gear like i went with. The cam goes up against the back block plug, which should be flush with the outside of the block. You will have to trim some off of the plastick cam button, because the timing cover wont fit all the way on unless you shave some off the button. I used a needle bearing button on mine, and what i did was put some grease on the end of the button, stuck the cover up against the block to see where the button was hitting the chrome cover. I then turned the cover face down on some wood with a socket the size of the button, and made a round dent in the cover. Just enough to give the cam about .005 movement.
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Old 03-12-2008, 07:51 PM
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Another pretty neat adjustability feature is to get a Cloyes timing cover.

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