360 Vacuum question

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May 21, 2003 | 07:37 PM

1976 ranger

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Joined: Mar 2003

Posts: 171

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From: Garfield Hts, Ohio

360 Vacuum question

I have a 360 with a recenty rebuild with only 5 miles on it. I put a vacuum gauge on it and it has 18 hgs of vacum but rapidly moves too 15 hgs while idleing. Is this normal until the rings seat or could i have a leak some where. Prior to rebuild had no problems with it.
Thanks
David

May 22, 2003 | 03:46 AM

macguyver

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Joined: Aug 2002

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From: Minneapolis, MN

360 Vacuum question

If it's pulsing between 15 and 18 it sounds like an intake valve isn't sealing. What did the rebuild entail? Were the valves ground? It's possible that a valve might be recessed into the head slightly causing the lifter to bottom out keeping it open (if the tops weren't ground to the proper height). A shorter pushrod on the offending valve should help if that's the case.