Old NGK BUR7EQ PN#3559
http://www.summitracing.com/parts/ngk-3559
	Quote:
	
	
		| Brand: NGK Spark Plugs Manufacturer's Part Number: 3559
 Part Type: Spark Plugs
 Product Line: NGK Standard Series Spark Plugs
 Summit Racing Part Number: NGK-3559
 
 UPC: 087295135594
 Shorty Spark Plug: No
 Resistor: Yes
 Manufacturer Heat Range: 7
 Electrode Core Material: Copper
 Electrode Tip Material: Nickel alloy
 Insulator Type: Non-projected
 Spark Plug Thread Size: 14mm
 Spark Plug Reach: 0.750 in.
 Spark Plug Seat Style: Gasket
 Wrench Diameter: 13/16 in.
 Ground Strap Quantity: Four
 NGK Part Number: BUR7EQ
 Quantity: Sold individually.
 | 
	
 
New NGK BUR7EQ PN#6917
http://www.summitracing.com/parts/ngk-6917
	Quote:
	
	
		| Brand: NGK Spark Plugs Manufacturer's Part Number: 6917
 Part Type: Spark Plugs
 Product Line: NGK Standard Series Spark Plugs
 Summit Racing Part Number: NGK-6917
 
 Shorty Spark Plug: No
 Resistor: Yes
 Manufacturer Heat Range: 7
 Electrode Core Material: Copper
 Electrode Tip Material: Copper
 Spark Plug Thread Size: 14mm
 Spark Plug Reach: 21.5mm
 Spark Plug Seat Style: Gasket Wrench Diameter: 13/16 in.
 Ground Strap Quantity: One
 NGK Part Number: BUR7EQ
 Quantity: Sold individually.
 | 
	
 
Note between the two...
* Material - 
Nickel Alloy versus 
Copper
* Spark Plug Reach - 
0.750 in. versus 
21.5mm
* Ground Strap Quantity - 
Four versus 
One
-Ted