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In-Store Pickup Location

MSD Digital GM High Energy Modules with Rev Limiters 83647

Ignition Control Module, Heat Digital HEI Module, With Rev limiter, Each

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  • Order this item and get free delivery and handling on your entire order! Offer excludes truck freight and oversize fees. Valid on orders shipped in the contiguous United States.

Hazardous Material Warning
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WARNING: Cancer and Reproductive Harm For more information, visit www.P65warnings.ca.gov.

Brand: MSD Ignition

Manufacturer's Part Number: 83647

Part Type: Ignition Modules

Product Line: MSD Digital GM High Energy Modules with Rev Limiters

Summit Racing Part Number: MSD-83647

UPC: 085132836475

Module Pin Quantity: 4

Wiring Harness Included: Yes

Quantity: Sold individually.

Notes: This module fits stock GM HEI distributor housings (original condenser assembly must be removed) or MSD-8365 Pro-Billet HEI distributors only.

CARB EO Number: D-40-43 (pdf)
To see a list of qualifying vehicles, enter CARB EO Number D-40-43

Emissions: California EO Approved

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

MSD Digital GM high-energy modules with rev limiters allow you to adjust the rpm limit between 5,000 and 9,000 rpm. True high-performance modules built for HEI distributors, they produce 50 percent higher coil drive currents than the stock module. This saturates the coil faster, which gives you more spark energy at top speeds. The results are increased horsepower and rpm range, and improved starting. When used with MSD's HEI coil, these plug-in modules create a potent high-energy spark to 9,000 rpm. MSD GM HEI modules replace all 4-pin modules used in HEI distributors with a vacuum advance canister. They can be used with factory, aftermarket, or MSD HEI distributors.

Warranty

Questions & Answers Ask a Product Question
Q:

What's the warranty on this module?

How is the rev limiter adjusted?

Where is the module made?

Asked by POPPLETON on September 05, 2017

A:

Warranty is one year

DARRELL from CA answered on September 07, 2017

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Q:

will this work on a 1983 Pontiac Trans Am or 1984 Chevrolet Corvette with a crossfire injection 305/350?

Asked by CHRIS on July 01, 2018

A:

Chris, this is a 4-pin HEI module replacement only. Both the 83 Trans Am and the 84 Corvette use 7-pin HEI modules so the 83647 will not work.

MSD Ignition MSD Ignition Answer - July 03, 2018

+See All Answers (2) Answer This Question

Q:

Does this module produce multiple sparks to 3000 rpm?

Asked by EDDIE on June 15, 2018

A:

Eddie, The 83647 HEI module does not produce multi-sparks below 3,000 RPM. You would need to add an MSD ignition box such as a part number 6425 to get the multiple spark feature to 3,000 RPM.

MSD Ignition MSD Ignition Answer - June 18, 2018

+See All Answers (2) Answer This Question

Q:

Will this work with the summit HEI vacuum advance distributor?

Asked by on March 01, 2018

A:

Yes it will i installed this in my 86 sbc with vacuum advance, truck starts and runs better than it ever has

HEATH from KS answered on March 02, 2018

+See All Answers (2) Answer This Question

+See All Questions (5)

Most Helpful Reviews Review This Product

52 Customer Reviews for MSD Ignition 83647 - MSD Digital GM High Energy Modules with Rev Limiters

Average Customer Review

5 Star

(28)

4 Star

(7)

3 Star

(4)

2 Star

(2)

1 Star

(11)

+See All 52 Reviews

Worked as expected

Summit RacingSummit Racing Verified Purchase

MSD-83647
I purchased this in the hopes that at idle or under 2000 rpm it would burn fuel efficient. Since putting in the 4 pin I have noticed the fuel smells have gone and now getting on it while cruising the rev limiter works as expected and easy to setup and change. I am happy with the product. The jury is still out but have noticed the economy seems to have increased now with ac on my 67 chevelle with a 454 bigblock the idle doesn't drop random and it holds nice and stable. Before the stock 4 pin the idle would random drop from 900 rpm to 400 and sometime the motor would stall. No longer having this issue since the upgrade and thought I would report since I read reviews before purchase. ...read more

5 of 5 found this review helpful.

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Reviewer: from TX

Date: May 19, 2014

Appearance
Ease of Installation
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Quality

MSD Digital GM High Energy Modules with Rev Limit

Summit RacingSummit Racing Verified Purchase

MSD-83647
Cool product. Was not sure if this would work but it is flawless so far. Have not run engine enough to determine durability but so far so good. I bought a Summit billet distributor (HEI) then replaced the module with this one. This was my way of getting the features and quality I wanted on the cheap in the form of mix and match. It's worked great so far. The details of operation are good but I still do not know how many times I can revise the rev limiter. I figured this is a good way to use it as Valet switch to protect the car from the tire shop if I'm not there. Don't let the appearance sway you away. Seeing the solder points and wiring and make some feel uneasy but it's a good product. I may do it again on my other car. ...read more

5 of 5 found this review helpful.

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Reviewer: from MI

Date: March 17, 2014

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Quality

Ignition module for E Street FI by Edelbrock

Summit RacingSummit Racing Verified Purchase

MSD-83647
By recommendation of Edelbrock techs I installed this to provide a clean tach signal for my E Street fuel injection. It did not work any better than the stock HEI module.. At 4000rpm the injection dies and the engine does not rev over 4k. I went back to Mallory ignition and carb works great, 6000rpm plus. Moral of the story, for street use it probably works but for feeding tach signal to an E Street fuel injection system it doesn't. ...read more

4 of 5 found this review helpful.

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Reviewer: from CA

Date: May 22, 2014

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Quality

MSD HEI

Summit RacingSummit Racing Verified Purchase

MSD-83647
I am impressed with the performance of this ignition module. The rev limiter works well every time it is hit and is easy to set. I like the rev limit verification feature also. I wish the limiter was a little softer like my MSD 7 series box but for the price you cant beat it.

3 of 3 found this review helpful.

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Reviewer: from NC

Date: May 27, 2014

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MSD HEAT HEI module

Summit RacingSummit Racing Verified Purchase

MSD-83647
Its a good product, install was easy and perform good as expected.

2 of 2 found this review helpful.

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Reviewer: from Indonesia

Date: March 19, 2014

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Some parts are not legal for use in California or other states with similar laws / regulations

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