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351M "straight up cam timing"

 
  #16  
Old 10-23-2003, 04:31 PM
Brian S
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Start with Comp Cams tutorials

for some backround info about cam terminology.
http://www.compcams.com/information/tutorials/
 
  #17  
Old 10-23-2003, 05:52 PM
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would you recommend cutting another keyway into the crankshaft sprocked... ?
Not unless you are a skilled machinist with way too much time on your hands.

It would be easier to change the crank sprocket if you want to change the cam timing.

Most aftermarket crank sprockets are available only in a set, with a matched cam sprocket and chain.
 
  #18  
Old 10-23-2003, 09:56 PM
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So if I get a new cam (like we've been discussing in another post) then I would also need a new timing chain with sprockets, correct? I mean using the originals would defeat the purpose of buying a performance camshaft, right?
 
  #19  
Old 10-24-2003, 07:27 AM
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Yes, get a double roller timing set. You can get a Cloyes set for about $70.00, but PAW sells their own brand for $40.00.
 
  #20  
Old 10-24-2003, 02:04 PM
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You really don't want to ever change on timing gear without changing the other as well as the chain. I have a first-hand nightmare with only changing a gear and retaining the rest on a Dodge 400. For the cost and peace of mind, change out the whole timing set, then you should be good for thousands of miles.

Steve
 
  #21  
Old 10-24-2003, 02:23 PM
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Basic rule of thumb on any type of chain, be it bicycle, timing, motorcycle or otherwise. If you put on one new part the rest of the worn parts will either try to conform to the new one and self-destruct, or they will make the new one conform to them and cause it to self-destruct.
 
  #22  
Old 10-24-2017, 01:45 PM
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I know itís been 15 yrs haha but Imo, I think you put the after market keyway on the advanced slot to make it straight up. Iím fixing to do it so if any one is still subscribed to this thread correct me if Iím wrong. Thanks
 
  #23  
Old 10-24-2017, 07:25 PM
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If your timing gear has 3 slots, one is 4 degrees retarded, the next is 0 degrees(straight up), and the third is 4 degrees advanced. The factory timing set was 4 degrees retarded.
 
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Old 10-24-2017, 08:56 PM
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So the 4 degree advance slot will actually make it 8 degree advanced on a 3 slot crank gear. Will that work?
 
  #25  
Old 10-24-2017, 09:06 PM
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No, 4 degrees advanced is 4 degrees advanced. 0 degrees is Zero degrees. 4 degrees retarded is 4 degrees retarded. The factory TIMING SET was 4 degrees retarded. The cam is neither retarded or advanced, until the timing set is installed.
 
  #26  
Old 10-25-2017, 10:57 AM
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Ok got it, thanks, everything I’ve read confused me. Because such a small difference in the two sprockets.
 
  #27  
Old 10-25-2017, 12:37 PM
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Originally Posted by danlee View Post
Yes, get a double roller timing set. You can get a Cloyes set for about $70.00, but PAW sells their own brand for $40.00.
PAW.Man,there's a trip down memory lane.
 
 
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