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Old 01-14-2011, 06:30 PM
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Retro Cam and Thrust Button

I am installing a retro roller cam in a sbc , I have the bearings installed in the block and have the cam installed. I know I need a thrust button to keep the cam in place but I have a few questions.

Will the core plug behind the cam keep it from going out the back of the engine?
How do I measure for what length of thrust button I need?
Is there a fairly common length?
Do I need a thrust bearing or washer between the timing gear and block?

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Old 01-14-2011, 07:18 PM
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roller cam walk

It kinda depends if the cam (with all valve-train installed) is a forward walker, rearward walker or neutral. They say you can measure it, i assume with the rear plug out and a dial indicator on it, but I have not actually done it.

The upper timing gear prevents rearward cam walk, some people like to use a thrust bearing equipped timing chain set(others don't like the potential needle bearings to fall downward - failure) others like a thrust washer or nothing between the block and the gear, in any case a small (.025-035) hole in the front middle oil gallery plug will provide extra oil for the chain and gear face/block interface. A thrust button should be used with .005-.010 clearance to a reinforced timing cover, a putty ball squeezed between the button and the cover dry fitted with gasket, file - grind the button for proper clearance. I think a stock or cheap chrome timing cover is a waste of time they will flex, a stiff cover is reasonably priced and good insurance.

I used a Cloyes w. needle thrust and a nylon button, aftermarket cover, and oil pinhole on my solid roller 327. No problems so far but really very little mileage thus far so really, what do I know? Good luck.
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Old 01-14-2011, 08:10 PM
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so how do I measure for what length of thrust button to get? Do I install the timing cover and push the cam and gear all the way against the timing cover and measure from the rear of the cam to where the core plug will be and subtract .005-.010 and get as close to that length as I can, a little longer if I have to then just grind the button down?
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Old 01-15-2011, 10:22 AM
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I got the alum. button from where I got my cam. Then I brought the reinforced cover that has the extra plate for the button to run against. I put it all together and took a screw driver blade as a bar to move the cam forward and back (no lifters in so I could put the blade in a lifter hole and move cam). I had to file the front of the buttom down till I got .005-.010 clearence. No real way to measure I just messed with it till I had what I felt was the correct movement of the cam forward. I messed up the first button learning what to do or not do. For me it was a learning experience. Trial and error--

Hope this helps--
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Old 01-15-2011, 11:01 PM
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cam button

The cam button that I got for my 3.8 buick roller came with shims. It was also rollerized.
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Old 01-16-2011, 07:40 AM
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Quote:
Originally Posted by dmx6
I got the alum. button from where I got my cam. Then I brought the reinforced cover that has the extra plate for the button to run against. I put it all together and took a screw driver blade as a bar to move the cam forward and back (no lifters in so I could put the blade in a lifter hole and move cam). I had to file the front of the buttom down till I got .005-.010 clearence. No real way to measure I just messed with it till I had what I felt was the correct movement of the cam forward. I messed up the first button learning what to do or not do. For me it was a learning experience. Trial and error--

Hope this helps--
What kind of cover are you using? I have a cloyes quick button cover. I set it to zero clearance cold and when the aluminum heats up that gives you your gap. This was done according to the instructions. Other brands may be different.
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Old 01-16-2011, 09:44 AM
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Can you give me a link to that cover, or a part number?
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Old 01-16-2011, 10:04 AM
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dmx6.. nice job. Now you know without guesswork. The spit hole is probably a good idea too, just don't make it too big, doesn't take much.
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Old 01-16-2011, 01:36 PM
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Quote:
Originally Posted by crussell85
Can you give me a link to that cover, or a part number?

Button # HER99001
Cover # MIL 65555

From Doug Herbert Racing
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