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 Distributor shim sizing
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4spta
Tribal Scout

USA
20 Posts

Posted - 11 Oct 2017 :  8:59:57 PM  Show Profile  Reply with Quote
Hi guys I was hoping someone could explain to me or tell me how to determine what size SIM goes between a distributor an engine block. And where do I get one. Possibly at a hardware store?

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

Bill Boyle
Horse Feathers (Charter Member)

USA
4793 Posts

Posted - 12 Oct 2017 :  07:58:14 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Hi Jeff

Why do you want to shim your HEI distributor? Isn't it the HEI that came stock with your TA 6.6 engine? Is you distributor misbehaving?

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 12 Oct 2017 :  10:42:09 AM  Show Profile  Reply with Quote
Normally the gasket is enough. An extra gasket could be used if needed.
Chevys can run into distributor clearance problems being the distributor mounts to the intake rather than the block.
If the distributor won't go all the way down, it may not be correctly engaged in the oil pump.
The intermediate shaft goes in from the oil pan side.
Check the fully engaged clearance with no gasket.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 12 Oct 2017 10:52:51 AM
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4spta
Tribal Scout

USA
20 Posts

Posted - 12 Oct 2017 :  12:13:59 PM  Show Profile  Reply with Quote
Thanks for the help guys. Im useing the stock HEI in my TA. Its been out of the engine for awhile and we have moved. A friend had mentioned I should of had a shim

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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4spta
Tribal Scout

USA
20 Posts

Posted - 12 Oct 2017 :  12:15:47 PM  Show Profile  Reply with Quote
My friend drives chevys so thers the problem lol. No

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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4spta
Tribal Scout

USA
20 Posts

Posted - 12 Oct 2017 :  12:17:46 PM  Show Profile  Reply with Quote
Blue the double gasket is a good idea thx Jeff

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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4spta
Tribal Scout

USA
20 Posts

Posted - 16 Oct 2017 :  4:33:36 PM  Show Profile  Reply with Quote
Problem solved thanks guys preciate it

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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cortcomp
Coyote

USA
5335 Posts

Posted - 16 Oct 2017 :  8:19:00 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
What ended up being the issue?
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 17 Oct 2017 :  10:38:27 PM  Show Profile  Reply with Quote
Are you sure he wasn't talking about shimming any excess end play in the distributor?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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4spta
Tribal Scout

USA
20 Posts

Posted - 18 Oct 2017 :  03:03:57 AM  Show Profile  Reply with Quote
Yeah I feel that's exactly what I was talking about how do I determine what size in if I need one

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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4spta
Tribal Scout

USA
20 Posts

Posted - 18 Oct 2017 :  03:04:59 AM  Show Profile  Reply with Quote
I am mostly concerned with up and down shaft play

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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Bill Boyle
Horse Feathers (Charter Member)

USA
4793 Posts

Posted - 18 Oct 2017 :  1:17:09 PM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
It's my understanding that the counter-clock rotation of the distributor shaft in concert with the cam gear, prevents up and down play of the shaft once the distributor is seated and bolted in place. Distributors that rotate clockwise are more likely in need of shims to minimize up and down travel of the shaft.

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 19 Oct 2017 :  11:37:53 AM  Show Profile  Reply with Quote
Oil pump load keeps the shaft pushed upward with engine turning. Timing variation will not occur here. Vertical clearance should not be less than .030 or .035..
An extra shim from a donor distributor can be added if needed.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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4spta
Tribal Scout

USA
20 Posts

Posted - 19 Oct 2017 :  12:04:49 PM  Show Profile  Reply with Quote
Thanks for the info guys.Makes sense to me what you were saying about the counter rotation of the motor and about the oil pump pushing up on the shaft which would push up on the distributor away from cam gear creating upward movement of the dist.shaft. Luckily I'm good on the up-and-down shaft play.So I guess I was worrying for nothing but it's better to ask than to find out the hard way. Thanks again.Jeff

400/467cu.310cfm kauffman D-ports w/1.65 steel roller rocker arms. XE274-H cam.Forged steel Ohio crank.Eagle rods. Icon pistons.Balanced.HSD intake.750mech.sec Holley.1-3/4in hedders.3 in collectors.2-1/2in exhaust.Flowmasters.ST-10 tranny.4.10 gears. 6 point cage.subframe connectors.every bushing polyurethane. F/R drag shocks line lock. Lightened up front end. Appox.3500lbs

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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 19 Oct 2017 :  2:04:05 PM  Show Profile  Reply with Quote
I used to have one of my HEI's shimmed up a bit for many years in a 400. But last year when I was setting up my new 462, I was going through every little detail and took the distributor apart to go over everything. I checked the installed distance with gasket in place and ended up removing the shims I put in there back in the 80's. The shims really served no good purpose in the end. Left the OEM washer/shim of course.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.

Edited by - Phil on 19 Oct 2017 2:05:50 PM
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