Slack in new timing chain
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Senior User
Joined: Apr 2004
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From: north central Indiana
Slack in new timing chain
In the process of assembling a '70 302 short block I discovered that the new full roller-type timing chain seems to have excessive slack. With one side of the chain pulled taut, the slack side has a deflection of about 5/16". Seems to me that either there's a problem with the new chain, or the block may have been align bored at some point. Does anyone have any other thoughts? Anything I may not have thought about? Anyone know where I could find the dimension from the cam to the crank, or know of another way to tell if the block has been align bored?
Senior User
Joined: May 2007
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Did you find out the problem with the timing chain? I ran into the same thing with my 83 5.0 H.O. engine, i figured it may have been aligned honed also. I haven't run the engine yet but i think it will be ok. I am running an edelbrock double roller. Also my fuel pump eccentric hit the back of my timing cover, glad i found that before starting it up.
The timing gear has a raised area that the stock double roller didn't have causing it to hit the back of the cover. I called the tech line and they said the engine probalbly had the wrong cover on it, but i don't think so. I shaved the eccentric down to clear the cover, hope that will be ok.
The timing gear has a raised area that the stock double roller didn't have causing it to hit the back of the cover. I called the tech line and they said the engine probalbly had the wrong cover on it, but i don't think so. I shaved the eccentric down to clear the cover, hope that will be ok.
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