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Product Summary

EFI Fuel System Type, Multi-port Injection Style

  • Features an optimized runner layout and constant cross sectional area
  • The minimum carb flange height will fit in vehicles with minimum hood modifications
  • Has a cast aluminum construction with a natural finish with a weight of just 11.5 lbs
  • It is a great manifold for centrifugal blower, turbocharged or NOS power adder applications
  • Manifold does not work with factory fuel rails and requires the use of Holley Fuel Rail Kit P/N 534-219

Rebates Available

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Key Specs

MFG. Part #300-137
BrandHolley
Intake Manifold TypeDual Plane
RPM Range2,500-7,000
Material TypeAluminum
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Need To Know

Quick and Easy Returns

Return Policy

Holley 300-137 Details

Single Plane Mid-Rise EFI LS Intake Manifold. All GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral port cylinder heads.

  • Kit does not work with factory fuel rails and requires the use of Holley Fuel Rail Kit P/N 534-219
  • 2500-7000 RPM power band
  • 4150 Square bore flange
  • Optimized runner layout and constant cross sectional area - broad torque curve, best vehicle performance from 2500-7000 RPM
  • Minimum carb flange height - fit in vehicles with minimum hood modifications
  • Cast aluminum construction - great manifold for centrifugal blower, turbocharged or NOS power adder applications
  • Efficient casting design - lightweight, consistent wall thicknesses, improved casting quality
  • Weight - 11.5 lbs.
  • Height (front) - 5.417" to the lifter valley cover flange at the engine block front flange
  • Port size - 2.50" height x 1.15" wide
  • Includes Viton® O-ring intake to cylinder head gaskets - Viton® is a registered trademark of DuPont Performance Elastomers

Charts

Rebates

Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.

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.

Holley 300-137 Specifications

KEY SPECS
MFG. Part #300-137
BrandHolley
Intake Manifold TypeDual Plane
RPM Range2,500-7,000
Material TypeAluminum
GENERAL
Fuel System TypeEFI
Injection StyleMulti-port
FinishNatural
EGRNo
Cylinder Head ConfigurationCathedral Port
Intake Section IncludedComplete
Plenum MaterialAluminum
Plenum FinishNatural
Throttle Body IncludedNo
Injectors IncludedNo
Aftermarket Fuel Rail RequiredYes
Fuel Rails IncludedNo
Overall Height5.42"
Runners IncludedNo
Runners RemovableNo
Supplemental Bosses Cast-InNo
Supplemental Bosses MachinedNo
Sold in QuantityEach
GTIN Code090127687758

Ratings & Reviews

4.7

3 Reviews

Overall Assessment

Customers appreciate the product for its high-quality and good fit. Its classic, retro aesthetic appeals to users, especially when paired with the Holley intake, throttle body, and air cleaner. It enhances builds, including for a 32 roadster and a 5.3 turbo build for an '84 Caprice. Users recommend it for retaining port EFI while also enhancing the look of their builds. The product is valued for its practicality, quality material, and reliable performance.

4.7

3 reviews

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Good price and good quality

5.0

7 years ago

Brad

Kansas City

Verified

Good fit

Would Recommend

Has the exact look I was hoping for.

5.0

9 years ago

Gearman

Marion Iowa

Verified

As this is being installed on a 32 roadster: the mix of a classic retro look plus the ability to retain port EFI were important to this build. The combination of the Holley intake, the throttle body and air cleaner together made this possible. As I am a stickler for hardware fastener appearance/overall match, most items I purchase always need something to match the theme...

Would Recommend

good fit

4.0

9 years ago

dgcycle

Kingston PA

Verified

Using on a 5.3 turbo build for a 84 caprice

Would Recommend

Showing 3 of 3 reviews

Fitment

  • GM LS6

  • GM LQ9

  • GM LQ9

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  • GM LS6

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  • GM LQ4

Customer Impersonation Script