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Muscle Series Valve Covers for Small Block Chevy Engines - Polished Finish

Small Block Chevy "Muscle Series" Valve Covers, Finned - Polished Finish

PART# 241-137

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Holley is pleased to introduce their Muscle Series Small Block Chevy valve covers inspired by 1970's era GM factory L82/LT1/Z28 equipped engines. These valve covers are a continuation of Holley's Vintage Series valve cover line featuring a classic finned design and retro styling cues. Each set consists of one valve cover with a twist-in oil fill knockout (oil fill cap included) and one with a recessed area to place an adhesive backed Holley emblem (also included) or any round emblem of your choice.


  • Designed to fit all 1958-86 Small Block Chevy engines with perimeter bolt patterns
  • Die-Cast aluminum construction ensures high detail and reduces the opportunity for warping of the valve cover flange and oil leaks
  • Standard height valve cover with pre-installed internal oil baffles
  • Factory style twist-in oil fill cap, round Holley emblem, and square oil fill and PCV grommets included
  • Available in four finishes to best suit your custom build: natural, polished, gloss black, factory orange


ApplicationSmall Block Chevy
Baffle IncludedYes
Bolt PatternPerimeter
Breather(s) IncludedNo
Emission Code3
Gaskets IncludedNo
Gromment(s) IncludedYes - OEM style square with 3/4" PCV and breather tube hole
Internal Dimensions2.45"
LogoHolley Badge
MaterialCast Aluminum
Mounting Hardware IncludedNo
Product TypeValve Covers
WarrantyLimited 90 Day
Part Number241-137



This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Tech Resources

These cast aluminum valves covers these may be slightly taller than OEM, however they are not designed to work with roller style rocker arms.

Warranty Information

Limited 90 Day: See Details


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        Some parts are not legal for use in California or other states with similar regulations.

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