Item No: 3923
AUTOLITE COPPER CORE SPARK PLUGS SET OF 8 14MM THREAD .750" REACH PART # 3923

Price:   $12.95
Shipping:   $5.50


  Quantity:  
AUTOLITE COPPER CORE SPARK PLUGS - SET OF 8
PART # 3923
 
AUTOLITE5224-1 
* ABOVE PHOTO IS A FILE PHOTO. YOU WILL RECEIVE 8 OF PART #
AUTOLITE 3923

These are the spark plugs we strongly recommend for our NKB and Procomp heads. We have dyno proven this plug style and temp range to be perfect for use with our heads for year round use. These are especially recommended for summer time. Those running in very cold climate may want to step up one heat range. We did at one time run the hotter (5224) plug, but noticed detonation coming in under load on the dyno when the timing was set to it s optimal position. Rather than back down on the timing as this would reduce performance we tried a set of these and the detonation went away. This plug is now used in most all of our engines and never have we noticed any fouling or issues with them. For those wanting a possibly better grade of spark plug we offer the NGK high performance plugs also. See our other listings. 

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Electrode Tip Material:Resistor
Manufacturer Heat Range:D11
Resistor:Suppressor
Spark Plug Reach:3/4 in
Spark Plug Seat Type:Gasket
Spark Plug Thread Size:14 mm
Tip Configuration:Power
Wrench Diameter:5/8 in
Quantity:                              Sold as a set of 8
Reach (in):                           .750
Manufacturer heat range:   3
Below is a file photo. You will rec. a full set of 8 part number 3923 

AUTOLITE5224
PAYMENT AND SHIPPING DETAILS
WE OFFER GREAT DISCOUNTS ON SHIPPING. YOU ONLY PAY THE FULL SHIPPING FEE ON THE HIGHEST SHIPPING COST OF YOUR ITEMS, AND HALF PRICE SHIPPING ON ALL ADDITIONAL ITEMS. FEW OFFER DISCOUNTS ON SHIPPING SUCH AS THIS. EMAIL US USING THE "ASK THE SELLER A QUESTION" TAB IF YOU WOULD LIKE US TO CALCULATE YOUR SHIPPING COST ON MULTIPLE ITEM ORDERS. YOU MAY ALSO REQUEST AN INVOICE AT TIME OF CHECKOUT. IF YOU ARE UNABLE TO CONTACT US BY EMAIL PLEASE GIVE US A CALL AT 423-722-5152 FROM 8AM-8PM EASTERN TIME MON-FRI AND 10AM-3PM ON SAT. WE WILL ANSWER YOUR EMAIL WITHIN THE ONE BUSINESS DAY IN MOST CASES, SO KEEP SHOPPING AND PAY HALF PRICE SHIPPING ON ALL ADDITIONAL ITEMS. OUR CHECKOUT SYSTEM WILL AUTOMATICALLY CALCULATE YOUR SHIPPING DISCOUNT AT TIME OF PAYMENT, SO LONG AS YOU CONSOLIDATE YOUR PAYMENT.
If you checkout and start over, the auto calculator will not recognize the multiple purchases, and there will be no shipping discount. Should you decide to start purchasing again after checking out, you will need to contact us so we can calculate your shipping for you.
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