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MSD Digital GM High Energy Modules with Rev Limiters 83647

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$99.97

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

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Brand: MSD Ignition
Manufacturer's Part Number: 83647
Part Type: Ignition Modules
Summit Racing Part Number: MSD-83647

UPC: 085132836475
Module Pin Quantity: 4
Quantity: Sold individually.
Wiring Harness Included: Yes
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
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

These MSD Digital GM high-energy modules with rev limiters allow you to adjust the rpm limit between 5,000 and 10,000. 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 10,000 rpm. MSD's 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.

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Most Helpful Reviews Review this Product

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

Average Customer Review

5 Star

(3)

4 Star

(1)

3 Star

(1)

2 Star

(1)

1 Star

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MSD Digital GM High Energy Modules with Rev Limit

Summit RacingSummit Racing Verified Purchase

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

2 of 2 found this review helpful.

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Reviewer: GUY from MI

Date: March 17, 2014

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MSD HEI

Summit RacingSummit Racing Verified Purchase

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.

1 of 1 found this review helpful.

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Reviewer: WALKER from NC

Date: May 27, 2014

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Ignition module for E Street FI by Edelbrock

Summit RacingSummit Racing Verified Purchase

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

1 of 1 found this review helpful.

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Reviewer: CHADWICK from CA

Date: May 22, 2014

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Worked as expected

Summit RacingSummit Racing Verified Purchase

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

1 of 1 found this review helpful.

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Reviewer: CHARLES from TX

Date: May 19, 2014

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MSD HEAT HEI module

Summit RacingSummit Racing Verified Purchase

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

1 of 1 found this review helpful.

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Reviewer: JAYA from Indonesia

Date: March 19, 2014

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Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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