HEI External Timing Adjustment Knob
HEI External Timing Adjustment Knob
Speedway Motors

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#91012344

HEI External Timing Adjustment Knob

  • This little jewel replaces the vacuum advance on an HEI distributor
  • Allows you to change the timing without having to loosen the distributor
  • Just turn the knob for instant timing adjustments
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$29.99

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Product Summary

  • This little jewel replaces the vacuum advance on an HEI distributor
  • Allows you to change the timing without having to loosen the distributor
  • Just turn the knob for instant timing adjustments
  • Features a Natural aluminum finish
  • Perfect for your Race Car or Street Machine
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Key Specs

MFG. Part #91012344
BrandSpeedway Motors
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Speedway Motors 91012344 Details

This little jewel replaces the vacuum advance on an HEI distributor. This allows you to change the timing without having to loosen the distributor - just turn the knob.

Fits V8 engine HEI distributor only.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.
CA Prop 65
CARB warning

Speedway Motors 91012344 Specifications

KEY SPECS
MFG. Part #91012344
BrandSpeedway Motors
GENERAL
Sold in QuantityEach

Ratings & Reviews

4.6

15 Reviews

Overall Assessment

The product is highly recommended for its functionality in aiding with timing and rotor phasing adjustments. Users find it to be a clever and practical solution for locking out HEI distributors and transforming them for true synchronicity. It works great for racing and is seen as a great invention against previously thought impossibilities. It's generally easy to install and fits well with various HEI units, although minor modifications might be necessary. The product's design and construction were overall appreciated, even though some users found it required a bit of work for it to fit certain models. Despite a few issues, the product's efficiency and unique features place it ahead of the competition.

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4.6

15 reviews

5

12

4

1

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2

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Most Liked Positive Review

5.0

Works great with modification

Used it to adjust phase, after locking out a cheap Procomp HEI to run with my Fitech. Had to remove aluminum inside distributor that held the old vacuum canister with a dremel tool, and elongate a mounting hole on the new part to make it work. After all that and a little blue locktite it works awesome!!!

Most Liked Negative Review

2.0

adjuster

i had to highly modify my stock hei to make this fit. and the adjustment range seems to fine for the work it was to install.

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I would buy again

5.0

3 years ago

Max

Petersburg,IN

Verified

Helped in locking out hei distributor

Would Recommend

Perfect product

5.0

5 years ago

Dirtcracker

Idaho

Verified

Easily allows timing adjustments without physically moving distributor.

Good for phasing HEI distributor.

4.0

5 years ago

Den

Iowa

Verified

I had to drill out mounting hole for screws to fit. The adjustment stud wouldn't clear distributor standoff had to grind it off. Other than this adjuster works great to phase HEI for Holley EFI. Used a clear dist. Cap & timing light to phase rotor.

Would Recommend

Clever solution.

5.0

5 years ago

Roy

Norway

Verified

Easy way to get adjustable vacuum lock-out

Would Recommend

yes i would

5.0

5 years ago

tnt

california

Verified

racing

Would Recommend

looks good haven't installed yet , future project !

5.0

6 years ago

Putz

GB Wi

Verified

Looks like an easy install , looked it over and appears it should work as described

Would Recommend

Awesome design

5.0

6 years ago

Dusty

Johnson City TN

Verified

This timing advance works great for rotor phasing

Would Recommend

Works great with modification

5.0

7 years ago

69 Nova

Apple Valley, CA

Verified

Used it to adjust phase, after locking out a cheap Procomp HEI to run with my Fitech. Had to remove aluminum inside distributor that held the old vacuum canister with a dremel tool, and elongate a mounting hole on the new part to make it work. After all that and a little blue locktite it works awesome!!!

Would Recommend

Customer review image

Handy idea...wish i had thought of it....well made..works!!!

5.0

8 years ago

SuperDave

Florida

Verified

Just what is needed to convert you HEI for true synchronicity =)

Would Recommend

Yes I would

5.0

8 years ago

Jess

Binghamton ny

Verified

In my race car work good

Would Recommend

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Questions & Answers

7 Questions • 9 Answers

Can this be used on the Oldsmobile hei distributor?

by Odintech

• a year ago

1 answer

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Can this be used on hei distributors that are not locked out or is it only for lock out distributor use?

by nick

• 6 years ago

1 answer

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Will this work on HEI inliner 6cyl 292 gm hei dist.. If not .. Can u give me th part numder..

by Robert

• 8 years ago

2 answers

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do you have installation instructions?

by Bill

• 9 years ago

2 answers

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How many degrees timing will this change?

by Reggie

• 10 years ago

1 answer

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nuts how can i keep the little lock nuts from loosening. has this been tested in real race cars? if so any problems?

by lenphi22

• 12 years ago

1 answer

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Is this for a GM HEI distributor?

by cknadroj

• 12 years ago

1 answer

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