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big block 3 bolt timing sprocket on a single bolt cam?
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1960fury
Posted 2017-09-19 8:23 AM (#548694)
Subject: big block 3 bolt timing sprocket on a single bolt cam?



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can you run a 3 bolt sprocket on a single bolt cam? the pin seems to be in the same location so if the center bore has the same diameter it should work. anybody knows the answer?
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Shep
Posted 2017-09-19 11:21 AM (#548701 - in reply to #548694)
Subject: Re: big block 3 bolt timing sprocket on a single bolt cam?



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You need the matching cam to use a 3 bolt.
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1960fury
Posted 2017-09-19 1:58 PM (#548715 - in reply to #548694)
Subject: Re: big block 3 bolt timing sprocket on a single bolt cam?



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are you 100% sure? have you tried? doesn't the pin match or the center bore? or both?
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57chizler
Posted 2017-09-19 2:01 PM (#548718 - in reply to #548694)
Subject: RE: big block 3 bolt timing sprocket on a single bolt cam?



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The big difference is in the way the sprocket indexes on the front cam journal. The single-bolt sprocket indexes off of the front journal snout and the dowel pin; the front journal face is flush with the block.

The 3-bolt front journal is wider and the face extends about 1/8" from the block; the block side of the sprocket has a counter bore that indexes on the outer diameter of the journal and the dowel pin.



(Cam Sprockets.JPG)



Attachments
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Attachments Cam Sprockets.JPG (180KB - 148 downloads)
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1960fury
Posted 2017-09-19 3:03 PM (#548720 - in reply to #548694)
Subject: Re: big block 3 bolt timing sprocket on a single bolt cam?



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I see. A big THANKS John and Dave.

Edited by 1960fury 2017-09-19 3:04 PM
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60 Imp
Posted 2017-09-21 3:28 AM (#548838 - in reply to #548694)
Subject: RE: big block 3 bolt timing sprocket on a single bolt cam?


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Sid, are you changing out the timing gear in the Fury?

If so be aware of the new cam sprocket touching the block.
This happened to me when I installed a new (single bolt) set in my 413, with the original cam. There was an embossed number on the back side of the cam sprocket which touched a bulge on the front of the block (oil gallery I think). It sounded like a bad big end and destroyed the new timing set. I purchased another different brand set to fit to the motor and had to machine the back-side of that cam sprocket to make clearance, as it was very close also.

Steve.
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1960fury
Posted 2017-09-21 8:09 AM (#548847 - in reply to #548694)
Subject: Re: big block 3 bolt timing sprocket on a single bolt cam?



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i replaced bb timing chains several times but never ran into this problem. but thanks for the heads up Steve!
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BigBlockMopar
Posted 2017-09-21 1:47 PM (#548873 - in reply to #548694)
Subject: Re: big block 3 bolt timing sprocket on a single bolt cam?



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A few seconds with a flapper sanding disc is usually all it takes to clearance the block.
Had it happen a number of times too with the dual roller timing chain sets.
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57chizler
Posted 2017-09-22 2:11 PM (#548971 - in reply to #548838)
Subject: RE: big block 3 bolt timing sprocket on a single bolt cam?



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60 Imp - 2017-09-21 12:28 AM
If so be aware of the new cam sprocket touching the block.
This happened to me when I installed a new (single bolt) set in my 413, with the original cam. There was an embossed number on the back side of the cam sprocket which touched a bulge on the front of the block.


Was that a double-row chain sprocket or original single-row?
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