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Old 08-27-2018, 09:11 AM   #11
Desert1957
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Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
Re: Backfire under loads

I personally have never seen a "305" with anything but the timing chain cover pictures below. If you are timing off the other style timing tab configuration, I'm surprised it would run at all.

With this cover you can only shine a timing light down at twelve o'clock, directly behind the water pump.

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http://67-72chevytrucks.com/vboard/s...d.php?t=498127
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