HEI, how much play is too much? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-14-2019, 01:55 AM
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HEI, how much play is too much?

Video's are self explanatory, is this normal or not?



Looks way too much to me, but im not used to chevies

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Old 08-14-2019, 08:26 AM
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Are you talking about enough clearance to pull the hei up and down without the gasket underneath to make sure its not being pushed down on the cam gear and it has a correct up and down movement which should be about .010 or more and I can't quite remember the whole spec range or are you talking about by moving the rotor back and forth while holding the gear still to make sure the mechanical advance is going in and out ok?
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Old 08-14-2019, 10:59 AM
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This distributor looks well aged, it's probably time for replacement.

Bogie
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Old 08-14-2019, 04:24 PM
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.020 is too much on the 1st one and the second one is the advance weights and is normal.
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Old 08-15-2019, 08:29 AM
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First, there's this;

Then, there's these;
https://www.summitracing.com/parts/mor-26140

The only thing that "might" be worn out is the bushings inside the body that guide the shaft. *Some* have bushings that can be replaced, other distributors use the actual body of the distributor as the guide material for the shaft-those cannot be repaired without machining the body to received bushings.
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Old 08-15-2019, 10:08 AM
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Stock GM distributors are sloppy when new. Every one has too much end play. That causes spark scatter in point type distributors. I don’t know what it would cause in a GM HEI distributor. I have never used a GM HEI distributor.

You should reduce the thrust (end play) on Stock GM distributors by removing the gear and placing hardened shim washers between the distributor housing and the gear. Reduce the thrust to .012” - .020”.

The distributor needs .012” - .020” thrust in order to oil the gear and with as much as .020” thrust, , spark scatter would be negligible.

My PerTronix Stock Look distributor had .018” thrust clearance right out of the box. That indicates good quality control during assembly at the factory.
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