Originally Posted by eric32
Hi guys I am in the process of tearing down my 350 sbc for a cam swap and I should have it all open to swap out cams by Thursday. I installed a jegs billet steel timing chain set last summer and it came with a torrington roller bearing on the back of the cam sprocket. The block has been clearanced for double roller chain anyways and was wondering do I really need to use it? I don't really want to get a new timing chain since mine should still be good since I have only about a few hundres miles on it.
I would like to take it out so I don't have to worry about it failing on me and then end up with roller bearings throught out my engine. Has anyone ran a similar timing chain like this and went with out it with no problems? Is it really necessary to run one.
I share your worries over roller thrust bearings coming apart. My personal choice would be to use a simple washer style thrust bearing. Keep in mind that the chain needs to be aligned thru the gears. This means that cam gear is usually clearanced for a thrust bearing when one is supplied. The OEM gear runs against the block without benefit of a thrust bearing. This is mostly OK to run the aluminum gear hub against the cast iron block, but it does mean that the block face is subject to possible wear and this is an item not easily repaired, so a thrust washer is a good idea to protect the block.