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Since 1952

HEI Advance Curve Kit

SAME DAY SHIPPING! Order within the next 8 hours 18 minutes and receive same day shipping

HEI Advance Curve Kit

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Please NOTE the following about this product:

  • This item is sold as a kit.



Q & A

What's in the Box

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.

550-929 Instructions (PDF) 

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
1 reviews
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1 Star

Verified Purchaser
Verified Reviewer
Fairbury, NE

Great product

November 12, 2015
Allowed me to dial in the timing on my 383 for good horsepower but slow enough to avoid detonation on lower octane fuel. Combined this with an adjustable vac advance to improve my mpg.
Yes, I recommend this product.
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