Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

MSD Ignition HEAT Digital HEI Module Fits Stock & MSD HEI Distributors

MSD Ignition 83647


made in usa
jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
MSD Ignition HEAT Digital HEI Module Fits Stock & MSD HEI Distributors $113.95
HEAT Digital HEI Module
  • Fits Stock & MSD HEI Distributors
  • CARB E.O. #D-40-43

  • MSD Ignition 83647 Details

    HEI Module


    Wiring Harness Included
    CARB EO Number
    D-40-43 (pdf)
    Module Pin Quantity
    Sold individually
    Manufacturer's Part Number:

    High-Output Performance

    Produce up to 8.5 amps of current with a direct plug-in MSD HEAT Digital HEI Module for 4-pin stock HEI distributors. This HEI module is digitally controlled for accurate timing and has a built-in adjustable rev limiter that ranges from 5,000-10,000 RPM.

  • Fits Stock & MSD HEI Distributors
  • Built-in Adjustable Rev Limiter
  • Digitally Controlled for Accuracy
  • Direct Plug-in for 4-Pin HEI Housings
  • Increased Racing Energy Continues Through 9,000 RPM

    Compatible with the Following Coils:
  • 121-8200
  • 121-8202
  • 121-8203
  • 121-8223
  • 121-8207
  • 121-8225

  • 83647 is rated 3.3 out of 5 by 4.
    Rated 5 out of 5 by from Easy installation! Installation can't be easier and the programming of the rev limiter is super simple.
    Date published: 2017-10-02
    Rated 5 out of 5 by from Tach Signal generator for Fuel Injection Installed Edelbrock EStreet2 fuel injection on my Oldsmobile. The instructions recommended this module to generate a clean tach signal. Installed easily and the car started right up after the installation of the module and the fuel injection system. I am using an HEI distributor with the HEAT module and MSD coil, cap, and rotor. I haven't driven the car for long periods of time yet, so far everything has been excellent.
    Date published: 2017-02-07
    Rated 2 out of 5 by from MSD PRO BILLET HEI Distributor and parts received the part in an OPEN factory sealed package. installed, burnt up another aprox. $90.00 HEI COIL (this made #7)., called MSD and spoke to tech. He instructed me to find a better ground. every electrical component in the distributor I had replaced, Grounded to same location as battery ground, insured I had between 11.5 and 12 vdc at hot wire to distributor. tried it, it started and ran for about 30 seconds. then died and didn't work again. you could probably imagine my frustration. I decided to replace the entire distributor. put an Eccel on my 454 and she started and havn't stopped yet. I guess DEPENDIBILITY is better than just the name brand.
    Date published: 2016-01-14
    Rated 1 out of 5 by from Didn't work Bought to upgrade distributor with a good clean tach signal output for fast ezi efi system . Car would not even start when installed had to go back to tach adapter supplied with fast kit
    Date published: 2015-12-24
    • y_2018, m_8, d_18, h_18
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_4
    • loc_en_US, sid_10001_10001_1273011, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    Will this MSD HEAT Digital HEI Module #83647 work on an accel HEI distributor. This distributor is only 1 1/2 years old and I have had to replace the module 3 times

    Asked by: danny2881
    No, but we do have Pertronix modules like this depending on the model - https://www.jegs.com/i/Pertronix/751/9AC-181/10002/-1
    Answered by: Rusty B
    Date published: 2018-08-08

    will this work like a rev-limiter

    Asked by: cheetah
    This has a built-in adjustable rev limiter that ranges from 5,000-10,000 RPM.
    Answered by: Rusty B
    Date published: 2018-03-31

    I have a ford engine with the Dragon fire HEI distributor will this module work on it?

    Asked by: Vince88
    As long as it takes a 4 pin module it will work.
    Answered by: BrandonJ
    Date published: 2017-12-21
    • y_2018, m_8, d_18, h_18CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_3
    • loc_en_US, sid_10001_10001_1273011, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations