Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle
Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle

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Enginetech ST18129N Exhaust Nickel-Alloy Valve Seats for 1971-2000 Chevrolet GMC - 1.500 ID x 1.8175 OD x .3125" Thick - 45deg Seat Angle

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$58.78
SKU: BBPT_ST18129N
Condition: New
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Description  

The Enginetech ST18129N is a 4-pack of exhaust-side nickel-alloy valve seats engineered as a stock replacement for 1971-2000 Chevrolet, GMC engine applications.

Important Notes

  • Sold as a 4-pack.
  • Application side: Exhaust valve position - confirm you are replacing the correct side.
  • Seat angle: 45deg - confirm head casting matches specified angle before installation.
  • Nickel-base cast construction: improved resistance to seat recession in LPG, CNG, and alternative-fuel applications.
  • With 1.720 - 1.750 valve head diameter.

Specifications

BrandEnginetech
Part NumberST18129N
Product TypeNickel-Alloy Valve Seats
Quantity per Pack4
Inner Diameter1.500"
Outer Diameter1.8175"
Thickness.3125"
Seat Angle45deg
MaterialNickel Base Cast
Application SideExhaust
Country of OriginUnited States
OEM / Aftermarket Cross ReferencesManley:82560, Dynagear:82560, SB International:SB1812-9N, Dura-Bond Bearing:70660, Dura-Bond Bearing:70907, General Motors:12350998

Vehicle Fitment

  • Years: 1971-2000
  • Makes: Chevrolet, GMC
  • Models: Blazer, C10, C10 Pickup, C10 Suburban, C15, C15 Suburban, C15/C1500 Pickup, C15/C1500 Suburban, C1500, C1500 Suburban, C20 Pickup, C20 Suburban, C25, C25 Suburban, C25/C2500 Suburban, C2500, C2500 Suburban, C30, C30 Pickup, C35, C35/C3500 Pickup, C3500, El Camino, G10 Van, G20, and more

Valve seats are precision-machined rings press-fit or cast into the cylinder head to form the sealing surface between the valve face and the combustion chamber. Over time, exhaust seats erode from hot combustion gases, suffer impact damage from valve float, or lose geometry from repeated valve-grinding operations - any of which leads to lost compression, burnt valves, and rough idle. Installing new valve seats during a head rebuild restores correct seat angle, sealing pressure, and thermal contact between the valve and the cylinder head.

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or reproductive harm, including lead and nickel.

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