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1981 GMC K3500 Exhaust Manifold Gasket Set 8 Cyl 7.4L Mr Gasket

4 on 3 ratings
  • Features:
    • Has A Graphite Core W/ Steel Outer Layers
    • Graphite Core Has Excellent Thermo-conductivity
    • Coated With High Temp Silicone For Sealing
    • Will Not Indent Aluminum Heads
  • Manufactured from high-temperature steel core/graphite faced exhaust material. Expanded steel core provides stability and maximum torque retention to eliminate gasket failure. Graphite facing provides excellent heat resistance and thermal conductivity to transfer heat away from the cylinder head. Conforms to and seals minor surface irregularities. High recovery material allows header or manifold flange to stay sealed if flange loses clamp-load. Can be trimmed if necessary for modified port applications. For original equipment replacement, high performance street, drag race and oval track use.

Additional Fitment Information:
Vehicle Block CC Engine CID
1981 GMC K3500 V - 8 Cyl 7.4L 454
12 In Stock
Best Price:

$62.66 USD
$75.19 USD
Brand Mr Gasket
Part # G125912
Condition New
Warehouse B
Mr Gasket

K3500 Mr Gasket Exhaust Manifold Gasket Set 5912 1981 GMC
  • Round Port Shape; Port Diameter 2.15 in.; Thickness .062 in.
  • Ultra Seal Exhaust Gasket Set; Round Port Shape; Port Diameter 2.15 in.; Thickness .062 in.;
  • Ultra Seal Exhaust Gasket Set

    • General

    Gasket Line
    Ultra-seal
    WARNING CA Proposition 65
    No
    Port Shape
    Round
    Collector Gaskets Included
    No
    Engine Make/Size
    Chevrolet Big Block Mark Iv
    Thickness
    0.062 In.
    Port Size
    2.150 In.

    Packaging

    package quantity
    1
    weight
    0.36 lb
    Information on technical characteristics, the delivery set, the country of manufacture and the appearance of the goods is for reference only and is based on the latest information available at the time of publication.
    1. Jimmy Stewart
      05 Aug, 2014
      Excellent update for 'gasketless' GM TBI small-blocks - proper port match. Don't forget to replace the old manifold bolts, as they won't hold torque after years of hot/cold cycling.
    2. Tom C
      04 Jun, 2013
      These are beautiful gaskets. I am thinking about getting an extra set to mount on the wall in my ManCave. I expect my rating will go up after the engine is reinstalled and running again.
    3. Bloose
      10 Oct, 2011
      When I first installed these I had a leak on the passenger side header. When I puller the header I found that the gasket didn't cover part of the header flange. In reality the problem was more with the header than the gasket but the gasket is also somewhat at fault. The reason I say this is because the gasket port size is a good bit larger than the port on the head. If they offered different gaskets for different part sizes you could likely get a better fit. I.E. one gasket for stock ports, one for larger ports, etc. Much as they do for Ford and Chevy. In the end though I cut the gasket into separate pieces for each port section. I then elongated the holes for the offending port and got it to match the header flange. No more leaks and is holding up well at 3500 miles.B

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