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Old 01-18-2007, 04:57 PM
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HEI end play

How important is the end play on the HEI? I'm running an original dist with plenty of space between the driven gear and the thrust washer. Does this make any difference once the gear is turning? I imagine it holds the shaft in one position as long as it's spinning.

Thanks,
-Michael

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Old 01-18-2007, 05:08 PM
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Quote:
Originally Posted by mhamilton
How important is the end play on the HEI? I'm running an original dist with plenty of space between the driven gear and the thrust washer. Does this make any difference once the gear is turning? I imagine it holds the shaft in one position as long as it's spinning.

Thanks,
-Michael
The gears will tend to climb up the teeth and that will alter the timing. I try to shim to about .030 ? (I think) vertical slop in the shaft, to give the aluminum housing room to grow when it gets hot.

Anybody else got a spec for this? I haven't done one in a long time. TOM?????
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Old 01-18-2007, 05:16 PM
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Thanks for the quick reply--

I can't belive this... since I posted, the forum finds the info I'm looking for (down below) HEI shaft play I had searched before posting, found nothing.

Are the mail order catalogs the only place to get the shims?
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Old 01-18-2007, 05:36 PM
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Quote:
Originally Posted by mhamilton
Thanks for the quick reply--

I can't belive this... since I posted, the forum finds the info I'm looking for (down below) HEI shaft play I had searched before posting, found nothing.

Are the mail order catalogs the only place to get the shims?

GSXMAN said .012-.020. !!!!!! Thanks for the refresher.

Maybe O'Reilly's or Auto Zone in their performance section. Call around local.
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Old 01-18-2007, 06:54 PM
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Dist Shims

Mr Gasket # 2820 is a dist gear shim set we stock/use

Chris Laarman
Ottawa Engine and Performance
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Old 01-18-2007, 07:30 PM
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Quote:
Mr Gasket # 2820 is a dist gear shim set we stock/use
Sorry I missed your post... just an hour ago I put an order in to Jegs for the shims. Of course they took me to the cleaners on shipping for a $5 part.

Well, I have other cars that I need to check the HEI on, I'll pm you.
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Old 01-18-2007, 07:34 PM
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Quote:
Originally Posted by mhamilton
.

Well, I have other cars that I need to check the HEI on, I'll pm you.
Good, a commonly overlooked tuning item.
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Old 01-18-2007, 08:32 PM
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Flat washer out of the junk drawer usually works for me.
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Old 01-19-2007, 03:10 AM
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HEI end play

I followed the advice of my buddy Steve and keep the endplay on my distributors to between .004-.008,and I too have used washers but could never find any the right size and had to drill/grind for a good fit.Last time I got a Moroso kit with different size shims.
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Old 01-19-2007, 09:19 AM
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Plays hell with the cap and rotor too.
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Old 01-19-2007, 10:33 AM
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What causes all the slop in these distributors? Is it wear of the gear, or is there a bearing surface under the timer core?
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Old 01-19-2007, 01:43 PM
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HEI end play

I think its just the way they are made.
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Old 01-20-2007, 05:58 AM
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Alloy dissys wear faster than iron ones. I keep endfloat down to .012 inch, any less and they can bind when hot - over 120f ambient. Too much endfloat will create top end retard as the drive gear is repelled off the cam in an anticlockwise direction.
BTW, Pontiacs with an anticlockwise dist rotation (wrong side of the cam) get top end advance with too much endfloat.
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Old 01-20-2007, 02:46 PM
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Quote:
Originally Posted by IanRiordan
Alloy dissys wear faster than iron ones. I keep endfloat down to .012 inch, any less and they can bind when hot - over 120f ambient. Too much endfloat will create top end retard as the drive gear is repelled off the cam in an anticlockwise direction.
BTW, Pontiacs with an anticlockwise dist rotation (wrong side of the cam) get top end advance with too much endfloat.
There's a good piece of information. Thanks..

I guess .020 is the consensus, right?
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Old 01-21-2007, 02:28 AM
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Twenty thou should be bang on the money regardless of operating temp.
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