MSD 83647 Heat HEI Ignition Module

Produces an incredible 7.5 amps of current, Enables you to adjust the rev limiter without removing the cap, Features an advanced dwell control for improved high rpm output, The built-in adjustable rev limiter can easily be set externally, It easily installs to non-computer controlled (4-Pin) HEI housings MSD 83647 Heat HEI Ignition Module Sku # 54783647 Mfr. Part # 83647 Condition New Brand MSD Sold Each Details

This all new Heat HEI Module supersedes the current PN 83645. Using upgraded components, the HEAT produces high output for stock and MSD applications plus has a built-in rev limiter that is more accurate and easier to set with the engine running.

Works with non-computer controlled (4-Pin) HEI housings.

• Easily installs to non-computer controlled (4-Pin) HEI housings
• Built-in adjustable rev limiter can easily be set externally
• Advanced dwell control for improved high rpm output
• The Hottest HEI Module you buy-period!
• Produces an incredible 7.5 amps of juice!
• Adjust the rev limiter without removing the cap!
• Fits in stock HEI distributors

Specs GTIN Code 085132836475 Reviews Great replacement Rated by Sam on December 25, 2025

Summary: Great replacement part

Yes, I recommend this product.

Great quality and ease of installation Rated by Spaaz on March 01, 2025

Summary: Swapped automatic out for 4 speed muncie needed a rev limiter the instructions were easy to understand and instalation was easy.

Yes, I recommend this product.

Great product Rated by Mike on October 11, 2023

Summary: This was one of the last things I could add to my chevelle to get a bit more power and a rev limiter. I would buy this again if I had another car to put it on

Yes, I recommend this product.

Easy to install, works like it should Rated by Romeo on March 14, 2020

Summary: Let's go racing!!!

Yes, I recommend this product.

Works well Rated by Jr on November 22, 2018

Summary: Fixed my high rpm misfire. Only reason it gets less than 5* is that it doesn't appear stock. It has a extra wires and if they pull the cap its clear this is not OEM. This same part inside a stock looking module would be better. That being said, the pertronix flame thrower failed on me after two nights which is what lead me to this. Happey with it, bit I wish I could have this performance in a stock looking package.

Yes, I recommend this product.

Related Items / Suggested Parts Scott Performance 10mm HEI Spark Plug Wire Set, Black MSD Heat HEI Ignition Module and High Performance HEI Coil Kit MSD 35599 8.5mm Spark Plug Wires Set, S/B Chevy HEI, Under Headers MSD 8416 GM HEI Distributor Cap and Rotor Scott Performance HEI 10mm Spark Plug Wires MSD 88362 HEI Ignition Module, Circle Track PerTronix D2070 HEI Igniton Module, 4-Pin, Race Only Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.