Rear block plug for camshaft - Team Camaro Tech
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post #1 of 3 (permalink) Old Feb 28th, 10, 06:21 AM Thread Starter
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Rear block plug for camshaft

If I seat the rear plug all the way in against the rear cam bearing, it looks like the cam is out too far, and sounds like it rubs against the end if the cam. Also the lifter bores are behind the lobes about 1/8 inch. How do I set this plug at the correct depth? Does it affect the cam alignment? What keeps a flat-tappet hydraulic cam from moving back & forth, the distributor? BTW, its a 68 327 block.
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post #2 of 3 (permalink) Old Feb 28th, 10, 07:05 AM
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Re: Rear block plug for camshaft

I just set the plug flush with the back of the block. A flat tappet cam has tapered lobes so the lifters rotate in the bores. That taper pushes the cam toward the back of the block. The upper timing chain gear rides on the front of the block to keep it from going too far in. Roller cams have no taper on the lobes so you need a thrust button or plate to keep the cam from coming forward. If you need to move that plug after installation I would just knock it out and replace it. That one is a pain to change later and it might lose tension if you drive it backwards.
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post #3 of 3 (permalink) Old Mar 3rd, 10, 11:10 AM
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Re: Rear block plug for camshaft

Quote:
Originally Posted by aharris05 View Post
Also the lifter bores are behind the lobes about 1/8 inch.
It's designed that way so the lifters will rotate in their bores.

JohnZ
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