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Accel 0437S-4 U-Groove Shorty Spark Plug, 13/16 Hex, 3/8 Reach, Gasket

Specs
Sold in Quantity:
Each
Seat Taper:
Gasket
Thread Pitch:
14mm
Wrench Size:
13/16"
Overall Length:
2.527
Thread Length:
.293
Spark Plug Reach:
.375
GTIN Code:
743047113097
Accel 0437S-4 U-Groove Shorty Spark Plug, 13/16 Hex, 3/8 Reach, Gasket

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Details

Reviews (1)

Q & A (2)

What's in the Box

Info

Save BIG during Happy HolleyDays! For a limited time receive up to 20% off select Holley, Demon, Earls, Flowtech, Hooker, Mallory, Mr. Gasket, MSD, NOS, Quick Time, and Weiand products. Sale prices valid thru 12/31/16.

Accels race proven U-Groove "Shorty" spark plugs are the cure for your "burnt plug boot" blues. The overall length has been reduced 1/4" to 3/8" to gain critical air gap space between the spark plug boot and the exhaust header tube. This helps eliminate burning the spark plug boot or dimpling the header tube. The shorter spark plug length also can make it easier to install and remove the spark plugs in certain applications where there is not a lot of room to fit a socket or move a wrench around.

These retain Accels patented U-groove design and are so well designed, one plug will cover several heat ranges.

Accels U-Groove design benefits:

  • More power to the wheels with improved ignitability
  • Improved throttle response and better fuel efficiency
  • Develops larger spark nucleus for improved combustion and reduced fouling

105-437S Accel plugs are compatible with:

  • AC = R43CS, R43S, R44SX, R45S
  • Autolite = 565, 566, 85, 86
  • Champion = RJ11YC, RJ12YC, RJ12YC6

Item Details

13/16" Hex
3/8" Reach
Gasket Seat

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
RATING BREAKDOWN
1 reviews
5 Stars
1
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

CFM Motorsports
Verified Purchaser
Verified Reviewer
Ceylon MN

Satisfied

September 22, 2016
There's only so much you can say about a set of spark plugs, however, these are shorter on the outside of the engine, to help with clearance issues. On a 58 Corvette, it helped me clear the steering box on the #1 cylinder, which looked nearly impossible with a normal plug.
Pros:
  • Fixes Clearance Issues
  • They Are Shorter
Cons:
  • I Didn't Find Any
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

2 questions : 2 answers

1 answers

What is the Gap setting for 437S plug? 327CI

bosshoag
Ok
May 06, 2014

What is the Gap setting for 437S plug? 327CI

Answers

May 06, 2014
EricM
Gap this plug to .035" for your application.
1 answers

What is the gap for a 302 DZ small block

dhsk
Denver, Colorado
December 02, 2015

What is the gap for a 302 DZ small block

Answers

December 03, 2015
Eric
Expert
If you are using the original points distributor spark plug gap of .028" to .030" is recommended. If you have upgraded to an electronic ignition you can go with a wider gap of .035" or possibly wider depending upon the ignition manufacturer's recommendation.
Page 1 of 1

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