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Product Summary

Aluminum, Natural, Natural

  • Aluminum block-off plate for Chevy LS Engines
  • Includes plates for intake ports, exhaust ports, and water pump
  • Intake port block-off plates are billet aluminum with a perfectly flat sealing surface
  • Perfect for engine storage, painting, and power washing
  • Kit seals one engine
See more details

Key Specs

MFG. Part #91081604
BrandSpeedway Motors
Material TypeAluminum
FinishNatural
See more specs

Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91081604 Details

  • Engine block off plates are the perfect solution for long term LS engine storage
  • Compatible with stock and aftermarket cathedral and rectangle port cylinder heads
  • Fits LS1, LS2, LS3, LS4, LS6, LS9, and LSA LS based engine families
  • Works with all truck-based Gen III/Gen IV LS engines (4.8L, 5.3L, 6.0L, and 6.2L)
  • NOT compatible with LS7 LS engines due to raised intake port configuration
  • Intake cover plates are made from 3/8-inch (.375-inch) billet aluminum
  • Exhaust and water pump cover plates are made from .090-inch aluminum
  • Retaining fasteners are not included
  • Manufactured in house at Speedway Motors in Lincoln, NE

Protect Your LS Engine with Easy-to-Use Port Block Off Plates

At some point or another in our hot rodding lives we’ve had to store an engine for an indefinite length of time. Perhaps your new project is in paint-prison? Or maybe the kids need braces, and your garage therapy must be put on hold. Whatever the reason, you need to put up your LS engine until such time you can continue with your project. This is the 21st century, so don’t waste your time attempting to make engine block off port covers with masking tape that dries out in a month leaving a powdery mess and no protection, or even worse duct tape that takes two days of cleaning the sticky mess off your pretty aluminum cylinder heads a year from now. Instead, pick up our aluminum LS engine block off plate kit that quickly and easily bolt down over your intake and exhaust ports and water pump inlet/outlet, fully sealing these ports from garage critters and keeping your LS ready to go.

A 3/8-inch Thick Intake Port Cover Ensures Proper Sealing

Our LS engine block off kit fits all LS engines except for the LS7 and is made from premium materials, including 3/8-inch-thick billet aluminum for our intake block off plates. These are machined to a true flatness, ensuring the best sealing possible. While gaskets or port O-rings are not included, you can easily cut custom intake gaskets for 100 percent moisture protection for pressure washing and painting duties using some intake gasket material if you so wish. The water pump and exhaust port block off plates are made from .090-inch-thick aluminum and can be enhanced with water pump and header gaskets for them as well for additional sealing security. Installation of these engine block off plates are quick and easy, requiring only clean and debris free gasket surfaces before installation. This engine block off kit can be used for storage of spare race engines, long term storage of a project engine, protecting port openings during pressure washing or painting, and more!

Kit Includes:

  • (2) 0.375-inch-thick billet aluminum intake port block off plates
  • (4) 0.090-inch-thick aluminum exhaust port block off plates
  • (2) 0.090-inch-thick aluminum water pump port block off plates

 

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Speedway Motors 91081604 Specifications

KEY SPECS
MFG. Part #91081604
BrandSpeedway Motors
Material TypeAluminum
FinishNatural
GENERAL
ColorNatural
Hardware IncludedNo
Sold in QuantityKit
NotesWill not fit LS7 engines

Ratings & Reviews

3

3 Reviews

Overall Assessment

Customers appreciate the quality and robustness of the intake covers, noting they're well-crafted from thick aluminum. However, concerns were raised about the thinness of the exhaust plates, with some users noting they may not seal effectively. Despite these mixed reviews, the chunky, high-quality intake plates stand out positively in comparison to other products on the market. It's worthy to note that customers recommend checking the product specs for material thickness before purchasing.

3

3 reviews

5

1

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Filter by Ratings

I want to order this part

5.0

11 months ago

Ahmed sarhan

Bahrain

Verified

I ordered this parts but the order not send please advise. For the issue

Would Recommend

didn't realize everything exhaust plates were so thin

2.0

3 years ago

random car guy

oregon

I did go back and read read after the product arrived and they do provide the thickness specs in the details but I was unhappy to find the intake plates so awesome and chunky and the exhaust plates super thin to where they won't press up against a gasket well enough to seal for pressure washing as I hoped

Would Not Recommend

Intake covers are great the other covers not so much

2.0

3 years ago

Megaatv

Louisiana

Verified

Intake covers are great made out of thick aluminum the exhaust manifold covers and water pump covers are made out of a much thinner cheaper material just doesn't seal the way I wanted it to.

Would Not Recommend

Showing 3 of 3 reviews

Fitment

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  • GM LM7

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  • GM L33

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LQ4

  • GM L20

  • GM LC9

  • GM LMG

  • GM L33

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

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  • GM L20

  • GM LM7

  • GM LY2

  • GM LC9

  • GM LMG

  • GM LM7

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • 6.2 Chevy LS V8

  • GM LH8

  • GM LH8

Customer Impersonation Script