"Goo on bottom of hei modual ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

panhead59 · 07-07-2018, 08:08 PM

New to hei. What's this about "goo on bottom of hei modual ?" And would that also go for the petronix modual that replaces points ? I don't remember anything about this in installation instructions. Wonder if the "goo" is present on new distributors ?

**truckster** · 07-07-2018, 08:55 PM

HEI uses thermal compound like computer CPUs do to transfer heat. Your module won't last long without it.

panhead59 · 07-07-2018, 08:57 PM

Widely available at local auto parts stores ? What's it called ? Thermal compound ?

**Steeveedee** · 07-07-2018, 09:02 PM

It's a conductive grease. The really good stuff uses silver particles, and the price shows it. That's for some really high heat transfer. An HEI module doesn't run as hot as an overclocked CPU, so doesn't need that good a conductivity.

panhead59 · 07-07-2018, 09:13 PM

So the petronix modual in my goat probably needs the goo. A modual is a modual right ? They are basically doing the same function.

Rich69shortfleet · 07-07-2018, 09:54 PM

Quote:

Originally Posted by panhead59

So the petronix modual in my goat probably needs the goo. A modual is a modual right ? They are basically doing the same function.

Pertronix units do not use the heat transfer compound.

The modules the various Pertronix systems use inside the distributor are simply an electronic trigger. The module in the HEI does more than just act as a trigger, thus it gets hot while the Pertonix modules don't really get hot on their own.

**truckster** · 07-07-2018, 11:37 PM

For my HEI distributors I buy thermal compound (also called thermal paste) at Best Buy or a computer store. It's a little more expensive, but a tube lasts a long time.

panhead59 · 07-08-2018, 06:28 AM

Ok tks guys. You can learn something new on here everyday ! I bet i wasn't the only one that didn't know about the grease. Not talked about a lot.

100%Chevy · 07-08-2018, 09:33 AM

It's die-electric grease.
It helps dissipate the heat generated by the module and conducts electricity(ground)New modules usually come with a note saying to use it.
Same stuff used to mount the cooling fins in your computer and for the same reason.
The better auto parts stores have it-Just ask for die-electric grease.
You do need to use it!
Mike.

95 S_Trucker · 07-08-2018, 10:04 AM

Quote:

Originally Posted by 100%Chevy

It's die-electric grease.
It helps dissipate the heat generated by the module and conducts electricity(ground)New modules usually come with a note saying to use it.
Same stuff used to mount the cooling fins in your computer and for the same reason.
The better auto parts stores have it-Just ask for die-electric grease.
You do need to use it!
Mike.

Dielectric grease and thermal compound is not the same thing. Dielectric grease is used to prevent corrosion. It is an insulator. It will actually cause the module to run hotter.

Thermal compound will transfer heat. It won't insulate it.

**Warrens69GMC** · 07-08-2018, 10:53 AM

Part nunber SL203 at Autozone

07-07-2018, 08:08 PM	#1
panhead59 Registered User Join Date: Feb 2012 Location: Vinton, Va. Posts: 493	"Goo on bottom of hei modual ? New to hei. What's this about "goo on bottom of hei modual ?" And would that also go for the petronix modual that replaces points ? I don't remember anything about this in installation instructions. Wonder if the "goo" is present on new distributors ? __________________ "You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive ! Last edited by panhead59; 07-07-2018 at 08:13 PM.

07-07-2018, 08:55 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,976	Re: "Goo on bottom of hei modual ? HEI uses thermal compound like computer CPUs do to transfer heat. Your module won't last long without it. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

07-07-2018, 08:57 PM	#3
panhead59 Registered User Join Date: Feb 2012 Location: Vinton, Va. Posts: 493	Re: "Goo on bottom of hei modual ? Widely available at local auto parts stores ? What's it called ? Thermal compound ? __________________ "You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive !

07-07-2018, 09:02 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,676	Re: "Goo on bottom of hei modual ? It's a conductive grease. The really good stuff uses silver particles, and the price shows it. That's for some really high heat transfer. An HEI module doesn't run as hot as an overclocked CPU, so doesn't need that good a conductivity. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-07-2018, 09:13 PM	#5
panhead59 Registered User Join Date: Feb 2012 Location: Vinton, Va. Posts: 493	Re: "Goo on bottom of hei modual ? So the petronix modual in my goat probably needs the goo. A modual is a modual right ? They are basically doing the same function. __________________ "You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive !

07-07-2018, 11:37 PM	#7
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,976	Re: "Goo on bottom of hei modual ? For my HEI distributors I buy thermal compound (also called thermal paste) at Best Buy or a computer store. It's a little more expensive, but a tube lasts a long time. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

07-08-2018, 06:28 AM	#8
panhead59 Registered User Join Date: Feb 2012 Location: Vinton, Va. Posts: 493	Re: "Goo on bottom of hei modual ? Ok tks guys. You can learn something new on here everyday ! I bet i wasn't the only one that didn't know about the grease. Not talked about a lot. __________________ "You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive !

07-08-2018, 09:33 AM	#9
100%Chevy Registered User Join Date: Jun 2008 Location: Moss Point,Ms. Posts: 1,439	Re: "Goo on bottom of hei modual ? It's die-electric grease. It helps dissipate the heat generated by the module and conducts electricity(ground)New modules usually come with a note saying to use it. Same stuff used to mount the cooling fins in your computer and for the same reason. The better auto parts stores have it-Just ask for die-electric grease. You do need to use it! Mike.

07-08-2018, 10:53 AM	#11
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,621	Re: "Goo on bottom of hei modual ? Part nunber SL203 at Autozone __________________ 1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT

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