C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rotor orientation

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Old Feb 4, 2023 | 01:06 PM
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Default Rotor orientation

At TDC its pointing a little past the front of the car. Does this look correct?
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Old Feb 4, 2023 | 01:18 PM
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No, at TDC it should point at cylinder 1. So move is a tooth or two counter clockwise. And then it could still be 180 degrees off if cylinder 1 is not on compression stroke.
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Old Feb 4, 2023 | 01:25 PM
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Factory position for #1 is about the 5 o'clock position. It really doesn't make much difference where the rotor is located as long as you put the number 1 wire where its pointing at and go from there. As mentioned above, if it dont start it could be 180 degrees out.
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Old Feb 4, 2023 | 04:29 PM
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5 oclock looking at the picture, i dont think so. The FSM shows it at about 8 or 9 oclock. There is a groove in the dist gear that matches a slot in the distributor so how can you move it a tooth or 2? I bought the harness online, a few places sell them.
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Old Feb 4, 2023 | 04:59 PM
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Originally Posted by johnfin
5 oclock looking at the picture, i dont think so. The FSM shows it at about 8 or 9 oclock. There is a groove in the dist gear that matches a slot in the distributor so how can you move it a tooth or 2? I bought the harness online, a few places sell them.
Go back and look at the thread you started about the plug wire retainer. It shows #1 plug wire around the 5 o'clock position, thats what I was basing my answer on.
Saying a tooth or two off is referencing the distributor gear meshing with the camshaft gear, nothing to do with the distributor itself.
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Old Feb 4, 2023 | 05:06 PM
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No WVZR-1 YOU have avoided the question. This thread is about distributor orientation. If you are concerned about the grommet you should have replied to my thread about the HEI rebuild.
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Old Feb 4, 2023 | 05:24 PM
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So I looked at that thread about the retainer and it looks like #1 is about 8 oclock. So I am a few degrees off but when I look up into the distributor gear it looks like there is a slotted receiver that looks like the oil pump slot but I guess the two dont join or else you would never get the thing together. Its just gear to gear, right?
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Old Feb 4, 2023 | 05:45 PM
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What you see in the distributor shaft is what engages the drive tang of the oil pump. The camshaft drives the distributor, the distributor in turn drives the oil pump.
Check the picture again, number one is on the drivers side. As JoBy stated, if you laid a straight edge from the distributor over to the number one cylinder, that would be about 5 o'clock. The front of the engine is to the left, not the bottom of the picture.
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Old Feb 4, 2023 | 06:02 PM
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78blueta, thats a good way to align it, thanks for the tip. Straight edge to #1 cylinder. Now I think I need a bigger distributor wrench. My offset one is for smaller distributors. Wonder if they make a HEI wrench.
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Old Feb 4, 2023 | 06:05 PM
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Originally Posted by johnfin
No WVZR-1 YOU have avoided the question. This thread is about distributor orientation. If you are concerned about the grommet you should have replied to my thread about the HEI rebuild.

Really?
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Old Feb 4, 2023 | 06:32 PM
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Yes really. You have to ask and answer questions in the correct thread so that people down the road can find the correct answer. It was hell for me to find that correct grommet because i could not find any internet posts. I was lucky and found the part.
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Old Feb 5, 2023 | 10:59 AM
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I cant get the distributor down for the life of me. Its an 1/8 high. I tried rotating the body, no luck. When in place where should the green groomet be located, passenger or driver side? Any tricks?
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Old Feb 5, 2023 | 11:08 AM
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You need to set distributor all the way down and see where rotor points. Figure out where you WANT it to point. Pull distributor and look down in engine and see where oil pump drive is facing. Take a long flat screwdriver and rotate oil pump drive clockwise and take a guess. Reinstall distributor and see where its at now. Might take a few times. Dont turn oil pump drive counter clockwise as the oil in it will slowly move it back to where it was. Like I said it'll take you a few times.
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Old Feb 5, 2023 | 11:57 AM
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Always amazed me how hung up people get over a distributor. There has to be a hundred threads on here about installing a distributor. There is no right or wrong way. Some get hung up on the cap that is numbered "1". Who cares.

Put the distributor in the hole and line everything up to your liking or how the FSM shows you.. If it doesn't drop in all the way, put minor pressure on it and bump the starter until the slots on the drive and the oil pump line up. NOW it will fall into place. Now is the time to find TDC of #1, not before. Once you have done this, observe what post the rotor is most lined up with, move the distributor slightly to conform, and make this your #1. Plug in the wires according to the firing order and rotation of the rotor. Simple.
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Old Feb 5, 2023 | 12:21 PM
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Ok it popped in and i think its at 5 oclock. What do you guys think.
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Old Feb 5, 2023 | 12:56 PM
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Originally Posted by johnfin
No WVZR-1 YOU have avoided the question. This thread is about distributor orientation. If you are concerned about the grommet you should have replied to my thread about the HEI rebuild.
Originally Posted by johnfin
Yes really. You have to ask and answer questions in the correct thread so that people down the road can find the correct answer. It was hell for me to find that correct grommet because i could not find any internet posts. I was lucky and found the part.
Johnfin, WVZR1 has over 21000 posts over the past couple of decades and has helped at least a thousand members over the years on this forum and you are telling him how to ask and answer questions. Why don't you youtube "how to set up a distributor" and figure it out yourself. A video carries much more information than a few sentences. What you are trying to do is very basic to most on here. It's ok to learn how to help yourself.

Last edited by 383vett; Feb 5, 2023 at 01:10 PM.
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Old Feb 5, 2023 | 01:02 PM
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Originally Posted by 383vett
Johnfin, WVZR1 has over 21000 posts over the past couple of decades and has helped at least a thousand members over the years on this forum and you are telling him how to ask and answer questions. Why don't you youtube "how to set up a distributor" and figure it out yourself. A video carries much more information than a few sentences. What you are trying to do is very basic to most on here. It's ok to learn how to help yourself.
Yes, 23 threads on the first two pages. That HAS to be a record.

Last edited by arbee; Feb 5, 2023 at 01:36 PM.
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Old Feb 5, 2023 | 05:58 PM
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Originally Posted by arbee
Always amazed me how hung up people get over a distributor. There has to be a hundred threads on here about installing a distributor. There is no right or wrong way. Some get hung up on the cap that is numbered "1". Who cares.

Put the distributor in the hole and line everything up to your liking or how the FSM shows you.. If it doesn't drop in all the way, put minor pressure on it and bump the starter until the slots on the drive and the oil pump line up. NOW it will fall into place. Now is the time to find TDC of #1, not before. Once you have done this, observe what post the rotor is most lined up with, move the distributor slightly to conform, and make this your #1. Plug in the wires according to the firing order and rotation of the rotor. Simple.
That works, yes.
But still there is a right and a wrong, and unless you have a reson for doing it wrong, then why not do it right?
Even if it is just to make it easier for the next guy that try to follow the workshop manual when changing spark plug wires.


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Old Feb 5, 2023 | 06:20 PM
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Originally Posted by JoBy
That works, yes.
But still there is a right and a wrong, and unless you have a reson for doing it wrong, then why not do it right?
Even if it is just to make it easier for the next guy that try to follow the workshop manual when changing spark plug wires.

The only "wrong is if the fkn thing doesn't run. If the "next guy" needs to follow a shop manual for something as simple as changing plug wires, then maybe he should put the wrenches down and step away. I know of no gearhead that pulls out the manual for such a procedure. You have been here a long time and I think you probably know your way around these cars. Are you trying to tell me you pull out your manual? If you do, then by all means - fill your boots. Follow the manual. Does the manual tell you how to engage the oil pump as I did?
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Old Feb 6, 2023 | 02:50 PM
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Originally Posted by arbee
The only "wrong is if the fkn thing doesn't run. If the "next guy" needs to follow a shop manual for something as simple as changing plug wires, then maybe he should put the wrenches down and step away. I know of no gearhead that pulls out the manual for such a procedure. You have been here a long time and I think you probably know your way around these cars. Are you trying to tell me you pull out your manual? If you do, then by all means - fill your boots. Follow the manual. Does the manual tell you how to engage the oil pump as I did?
I bought the Corvette 25 years ago this spring and I have had the distributor out more than a few times. Engine too, Currently a 372 CUI Dart Litte M. Thee differnt intakes. Supercharger and currently working on my third iteration of turbocharger. 4L80E transmission. Tuned chip in stock ECU, Replaced ECU with another GM ecu for MAF, convarted to MAP using Holden chip and rescaled for boost. Ran Haltech ECU for some years and now my second MaxxECU.

So yes, I am not afraid to do some wrenching, and I don't mind improving and changing stuff. But I do take my time to install the distributor on the correct tooth. It does take a few minutes extra time to align the oil pump drive, but it is not that hard to do.
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