*excludes Alaska, Hawaii & Puerto Rico

LS LS1 Coolant / Steam Port Block Off Plate Set

In stock
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Coolant Steam Port Plugs

Includes 2 coolant ports, 2 orings, and 2 bolts

  • Compatible with all GM LS series engines
  • Can be installed on the front or rear of the cylinder heads
  • Made in Wichita, Kansas from aerospace grade, USA produced, billet aluminum
*These do NOT have holes for crossover tube attachment

More Information

Bullet Point 1 Simplify your coolant crossover plumbing by plugging the front or rear ports in your cylinder heads
Manufacturer Part Number 551693
UPC 682384790151
Weight 0.180000
ICT Manufacturer ICT Billet
United States United States
Length Inches 2
Width Inches 2
Height Inches 1

WARNING - This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to


ALUMINUM: Most of the aluminum alloys used today contain some level of lead, usually less than .1%. Lead is known to the state of California to cause cancer and reproductive harm. Most aluminum alloys are physiologically inert in their solid form, and the lead is contained within, however user-generated dust and/or fumes may pose a hazard if inhaled or ingested. Heating beyond a certain temperature may also provide avenues for exposure.


STEEL (steel bolts):  Steel is an iron alloy with several metals including Nickel and Chromium. Both Nickel and Chromium are known to the State of California to cause cancer and reproductive harm, respectfully. This warning applies to stainless steels as well.