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#550929
GM HEI Distributor Mechanical Advance Curve Weight/Spring Kit
- Modifies any GM HEI distributor with either clockwise or counter clockwise rotation
- Center plate eliminates over centering of centrifugal weights
- Comes complete with detailed instructions
$15.49
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Product Summary
- Modifies any GM HEI distributor with either clockwise or counter clockwise rotation
- Center plate eliminates over centering of centrifugal weights
- Comes complete with detailed instructions
- Installation of this kit may alter emission levels
Need To Know
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855.313.9176Quick and Easy Returns
Return PolicySpeedway Motors 550929 Details
Speedway Motors 550929 Details
Modifies any GM HEI distributor with either clockwise or counterclockwise rotation and offers plenty of curve possibilities. Center plate eliminates overcentering of centrifugal weights. Comes complete with detailed instructions.
NOTE: Installation of this kit may alter emission levels.
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
Speedway Motors 550929 Specifications
Speedway Motors 550929 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 550929 |
| Brand | Speedway Motors |
Ratings & Reviews
4.8
12 Reviews
Customers highly recommend the product, particularly for improving the performance of HEI engines, citing its easy installation and adjustability. They have praised its quality and practical features, including its ability to fine-tune HEI distributors and adjust timing for optimized horsepower. The included instructions are also highly regarded. Users expressed satisfaction as the product's performance exceeded competitors, leading to increased fuel efficiency and potential cost savings. The product's material quality and safety have resulted in repeated purchases given its superb performance.
Ratings & Reviews
4.8
12 Reviews
Customers highly recommend the product, particularly for improving the performance of HEI engines, citing its easy installation and adjustability. They have praised its quality and practical features, including its ability to fine-tune HEI distributors and adjust timing for optimized horsepower. The included instructions are also highly regarded. Users expressed satisfaction as the product's performance exceeded competitors, leading to increased fuel efficiency and potential cost savings. The product's material quality and safety have resulted in repeated purchases given its superb performance.
4.8
12 reviews
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Easy to install, worked great!
5.0
a month ago
James
Massachusetts
Verified
I have bought other kits before, they can be hit or miss. The bushings can be wonky, and springs can be crap- this was a good kit, fit well, and the springs were good quality. Gave me about 10-12 degrees advance on an Accel distributor
Would Recommend
Absolutely
5.0
a year ago
Wheelbarrow
Elkader Iowa
Verified
Made the vacuum advance work correctly
Would Recommend
Instructions included
5.0
a year ago
Jay
Shoreline, WA
Verified
No other HEI kit has instructions telling you what is supposed to happen when you swap parts. Use any other kit and it's just guessing. Makes all the difference. The car drives like it just lost 500 lbs. and it gets better mileage.
Would Recommend
Great assortment for fine tuning
5.0
a year ago
Joey Flames
Scotch Plains NJ
Verified
Able to fine tune my distributor
Would Recommend
I would buy anytime
5.0
2 years ago
Jimmytats
Edna Ks
Verified
Perfect as described and worked how I wanted
Would Recommend
Good stuff works wonders
4.0
3 years ago
Leroy
Canby Oregon
Verified
This kit is going in a 454 motor home this kit help's almost any HEI wake up and work right
Would Recommend
I would purchase this product again,good quality
5.0
7 years ago
none
Liberal, Ks.
Verified
installed in my HEI, distributor, easy to adjust, worked fine
Would Recommend
Great deal
4.0
7 years ago
Dtape
Chanute, KS
Verified
Shipped quick
Nice kit
5.0
8 years ago
Ratmaro
Florida
Verified
Great for fine tuning an HEI distributor
Would Recommend
Yes
4.0
8 years ago
Joe
Sault Ste marie
Verified
Good
Would Recommend
Showing 10 of 12 reviews
Questions & Answers
Questions & Answers
3 Questions • 4 Answers
I have a g20 and I've rebuilt my hole distributor except this but there a lot wobbly becous I lost the spacers would this cause starting issues
by Marvin
• 8 years ago
2 answers
View Answers
I want to have 10 degrees mechanical advance. So I can set initial at 24-26 and total at 34-36 and leave vacuum cannister unhooked. Can I achieve this with this kit on an HEI SBC 350.
by Marsh
• 8 years ago
1 answer
View Answer
Do i need different spark plugs
by El Pastor
• 10 years ago
1 answer
View Answer
3 of 3 questions shown

