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Distributor not seating on manifold

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Old Dec 5, 2022 | 02:35 PM
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Default Distributor not seating on manifold

It drops right in, and the oil pump drive is fully engaged, but the distributor flange where the gasket is only touches one side of the manifold. The other side is about an 1/8 inch gap. This is a Jeg's vortec intake. Anyone experience this type of issue before? And what was your solution?
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Old Dec 5, 2022 | 04:11 PM
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Usually, you can put the clamp and bolt on the dizzy and just snug it down.
Then jog the IGN key and it will drop right in. Hopefully still within being timed.
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Old Dec 5, 2022 | 05:42 PM
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is the distributor new an is the gear on the right way
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Old Dec 5, 2022 | 05:48 PM
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Is the oil pump to drive rod fully seated?
and your sure the distributor is lined up and fully seating into the drive rod?
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Old Dec 5, 2022 | 05:57 PM
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Sounds like the manifold is defective.
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Old Dec 5, 2022 | 06:40 PM
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Originally Posted by SH-60B
It drops right in, and the oil pump drive is fully engaged, but the distributor flange where the gasket is only touches one side of the manifold. The other side is about an 1/8 inch gap. This is a Jeg's vortec intake. Anyone experience this type of issue before? And what was your solution?
Has the block been decked? This can change things.
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Old Dec 5, 2022 | 06:41 PM
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If you can post a pic
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Old Dec 5, 2022 | 06:47 PM
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i had an issue similar to this...pull the distributor and slide and extra gasket on it. If that isnt enough then go buy a distibutor with the adjustable collar. If you have to use that distributor have a spacer machined to take up the space with a gasket above and below
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Old Dec 5, 2022 | 06:56 PM
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ok start over. what all was done and was done in the immediate past? new intake and heads? or new distrib or both? oil pump been out? new drive shaft? sometimes the pump shaft can be hung up a little. maybe take a big screwdriver and give it a whack downwards into the pump drive shaft. post pic of the distributor gear. if you must pull it down with the bolt, then unbolt it and see if it stays down or pushes back up. a stack of gaskets will probably work but it is a little bubbaesque.
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Old Dec 6, 2022 | 07:13 AM
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Originally Posted by forman
is the distributor new an is the gear on the right way
It's an old HEI distributor with a new melonized gear for the roller cam in this vortec block. Gear is on the right way.
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Old Dec 6, 2022 | 07:14 AM
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Originally Posted by randallsteel
Is the oil pump to drive rod fully seated?
and your sure the distributor is lined up and fully seating into the drive rod?
Yes and Yes, AFAIK, but I will pull the distributor to verify that, thanks
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Old Dec 6, 2022 | 07:15 AM
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Originally Posted by '75
Sounds like the manifold is defective.
This is what I suspect.
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Old Dec 6, 2022 | 07:17 AM
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Originally Posted by kossuth
Has the block been decked? This can change things.
Good point, IDK the full history on this motor, but the PO said it had never been torn down.
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Old Dec 6, 2022 | 07:21 AM
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Originally Posted by Rescue Rogers
i had an issue similar to this...pull the distributor and slide and extra gasket on it. If that isnt enough then go buy a distibutor with the adjustable collar. If you have to use that distributor have a spacer machined to take up the space with a gasket above and below
If the distributor mounting flange was parallel to the manifold mounting surface this would work, but it's "crooked" to the surface. This leads me to believe the Jeg's manifold was incorrectly machined as the distributor fit well in the other motor it was in. But I'll pull it back out and double check everything folks have suggested, thanks
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Old Dec 6, 2022 | 07:24 AM
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Originally Posted by derekderek
ok start over. what all was done and was done in the immediate past? new intake and heads? or new distrib or both? oil pump been out? new drive shaft? sometimes the pump shaft can be hung up a little. maybe take a big screwdriver and give it a whack downwards into the pump drive shaft. post pic of the distributor gear. if you must pull it down with the bolt, then unbolt it and see if it stays down or pushes back up. a stack of gaskets will probably work but it is a little bubbaesque.
Yes a new Jeg's vortec manifold, known good distributor from a donor motor with a melonized gear installed, new oil pump and shaft. Thanks
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Old Dec 6, 2022 | 06:41 PM
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I had a similar problem a few years ago, ended up having to machine the tang on the end of dissy shaft slightly.
The radius in the corners was fouling on the pump drive shaft slot holding it up slightly.
Painted the tang with a sharpie and inserted dissy into the block, when pulled out could see where it was rubbing on the drive slot, so added a bit of extra clearance in the corners till it sat down properly.
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Old Dec 6, 2022 | 08:13 PM
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H-m-m-m-m-
Quote: New Oil Pump & new Shaft.
That could be the culprit instead of the Intake.

But, just curious. What Intake gaskets were used and what was installed on the china wall for a seal?
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To Distributor not seating on manifold

Old Dec 7, 2022 | 07:52 AM
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Originally Posted by HeadsU.P.
H-m-m-m-m-
Quote: New Oil Pump & new Shaft.
That could be the culprit instead of the Intake.

But, just curious. What Intake gaskets were used and what was installed on the china wall for a seal?
Fel-Pro gaskets and RTV walls
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Old Dec 7, 2022 | 08:00 AM
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Originally Posted by riverracer au
I had a similar problem a few years ago, ended up having to machine the tang on the end of dissy shaft slightly.
The radius in the corners was fouling on the pump drive shaft slot holding it up slightly.
Painted the tang with a sharpie and inserted dissy into the block, when pulled out could see where it was rubbing on the drive slot, so added a bit of extra clearance in the corners till it sat down properly.
Thanks for your input. The thing is: the distributor "seats", poorly. It contacts on the left side of the manifold flat surface, but has approx. a 1/8" gap on the right side. So it can't possibly go in the hole any further, it hits. I believe the manifold wasn't machined properly. Have you experienced any fitment issues with Jeg's intakes? It's been quite a while since I bought that manifold, But I'll try contacting Jeg's to see if they'll accept a return.
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Old Dec 7, 2022 | 08:56 AM
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Sounds like they have no choice but to replace it. Send him a picture with the distributor sitting in with no gasket clearly showing at contacting one side and the gap on the other.
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