Carburetor Power Valves and Components
Circle Track Race Car Carburetor Power Valves & Components at JJ Motorsports
Fine-tune your circle track race car's part-throttle and wide-open performance with premium Holley power valves and block-off plugs from JJ Motorsports. These high-quality components deliver precise vacuum-controlled enrichment, preventing lean spots and hesitation in high-RPM racing conditions. Available in popular 5.5" Hg and 6.5" Hg openings, plus block-off kits for full-race applications, they’re essential for dirt track, oval, and stock car setups running Holley 4150/4160 carbs.
Shop Holley power valves for race-proven reliability. Whether you're dialing in a short-track modified or a high-bank superspeedway late model, these valves pair perfectly with our jets & air bleeds or explore rebuild kits to keep your carb dialed all season.
Top Circle Track Carburetor Power Valves & Components
- Power Valve HLY125-55 – 5.5" Hg opening power valve; ideal for most circle track gas carbs with moderate vacuum.
- Power Valve HLY125-65 – 6.5" Hg opening power valve; popular choice for higher-vacuum street stock and IMCA engines.
- Power Valve Block-Off MRG1510 – Billet block-off plug with gasket; seals power valve circuit for full-race, no-enrichment setups.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Holley Power Valve 125-55
HOLLEY
$16.40Carburetor tuning demands precision, and the Holley Power Valve 125-55 delivers exactly that. This single-stage valve maintains optimal fuel mixture across your engine's RPM range, preventing bog-down during light throttle operation while ensuring clean,...HLY125-55- SKU:
- HLY125-55
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-55
$16.40 -
Mr. Gasket Hly Pwr Vlv Block-Off 1510
MR. GASKET
$17.05If you're running a Holley carburetor and need to disable the power valve for consistent jetting across varying engine loads, this Mr. Gasket block-off kit delivers a clean, permanent solution. The gold-anodized aluminum construction resists corrosion...MRG1510- SKU:
- MRG1510
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MFG Part #:
- 1510
$17.05 -
Holley Power Valve Plug 26-36
HOLLEY
$9.34A worn or missing power valve plug compromises your carburetor's precision tuning and can introduce fuel system leaks that affect idle quality and throttle response. This OEM Holley replacement ensures a clean, reliable seal with the included gasket,...HLY26-36- SKU:
- HLY26-36
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MFG Part #:
- 26-36
$9.34 -
Holley Power Valve 125-95
HOLLEY
$18.08The Holley Power Valve 125-95 is essential for carburetors that demand precise fuel metering across the RPM range. This single-stage valve opens at 9.5 inches of vacuum, enriching the fuel mixture during acceleration and part-throttle conditions to...HLY125-95- SKU:
- HLY125-95
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-95
$18.08 -
Holley Power Valve 125-85
HOLLEY
$18.22The Holley Power Valve 125-85 is essential for carburetor tuning precision—it automatically enriches your fuel mixture during acceleration and cruise conditions, optimizing drivability across the RPM range. Whether you're fine-tuning a street engine or...HLY125-85- SKU:
- HLY125-85
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-85
$18.22 -
Holley Power Valve 125-75
HOLLEY
$16.10The Holley Power Valve 125-75 is essential for tuning your carburetor's fuel delivery across the entire RPM range, ensuring optimal air-fuel ratios from idle through cruising speeds. By opening at 7.5 inches of vacuum, this single-stage valve prevents...HLY125-75- SKU:
- HLY125-75
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-75
$16.10 -
Holley Power Valve 125-65
HOLLEY
$14.65The Holley Power Valve 125-65 is essential for carburetor tuning, delivering precise fuel mixture control across varying engine loads and RPM ranges. This single-stage valve opens at 6.5 inches of vacuum, ensuring your engine runs lean during cruising...HLY125-65- SKU:
- HLY125-65
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-65
$14.65 -
Holley Power Valve Check Ball Kit 125-500
HOLLEY
$29.32Power valve failure is one of the most common causes of carburetor performance degradation, leading to poor fuel economy, hesitation, and inconsistent idle quality. This Holley check ball kit provides a straightforward solution to prevent costly damage...HLY125-500- SKU:
- HLY125-500
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MFG Part #:
- 125-500
$29.32 -
Holley Power Valve 125-50
HOLLEY
$20.09The Holley Power Valve 125-50 is essential for maintaining consistent carburetor performance across varying engine loads and throttle conditions. This single-stage valve automatically adjusts fuel mixture delivery by responding to engine vacuum,...HLY125-50- SKU:
- HLY125-50
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-50
$20.09 -
Holley Power Valve 125-45
HOLLEY
$15.33The Holley Power Valve 125-45 is essential for carburetors running lean cruise mixtures—it enriches fuel delivery under load to prevent stumble and hesitation while maintaining fuel economy at steady throttle. Whether you're tuning a street engine or...HLY125-45- SKU:
- HLY125-45
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-45
$15.33 -
Holley Power Valve 125-35
HOLLEY
$15.33The Holley Power Valve 125-35 is essential for optimizing your carburetor's fuel curve across the RPM range, ensuring lean cruise conditions while delivering the enrichment needed under load. This single-stage valve responds precisely to engine vacuum,...HLY125-35- SKU:
- HLY125-35
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-35
$15.33 -
Holley Power Valve 125-25
HOLLEY
$16.40Precise fuel delivery is the foundation of consistent carburetor performance, and the Holley Power Valve 125-25 is engineered to optimize your fuel mixture across the entire RPM range. This single-stage valve responds to engine vacuum conditions, leaning...HLY125-25- SKU:
- HLY125-25
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-25
$16.40 -
Holley Power Valve 125-185
HOLLEY
$31.96The Holley Power Valve 125-185 is essential for carburetors that demand precise fuel delivery across a wide RPM range. This single-stage valve opens at 8.5 inches of vacuum, allowing your engine to run lean during cruise conditions while enriching the...HLY125-185- SKU:
- HLY125-185
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-185
$31.96 -
Holley Power Valve 125-165
HOLLEY
$29.32The Holley Power Valve 125-165 is engineered to optimize fuel delivery across your engine's RPM range by responding dynamically to intake manifold vacuum. This single-stage design ensures crisp throttle response at partial throttle while maintaining...HLY125-165- SKU:
- HLY125-165
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MFG Part #:
- 125-165
$29.32 -
Holley Power Valve 125-155
HOLLEY
$31.96The Holley Power Valve 125-155 is essential for carburetor tuning when you need precise fuel mixture control across your engine's RPM range. This single-stage valve opens at 5.5 inches of vacuum, enriching the fuel mixture during off-idle and cruise...HLY125-155- SKU:
- HLY125-155
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-155
$31.96 -
Holley Power Valve 125-145
HOLLEY
$32.58If you're running a high-flow carburetor setup, your power valve directly controls fuel delivery under varying load conditions—get it wrong, and you'll suffer from lean-out issues, stumbling, or wasted fuel. The Holley 125-145 Power Valve is engineered...HLY125-145- SKU:
- HLY125-145
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-145
$32.58 -
Holley Power Valve 125-135
HOLLEY
$31.96The Holley Power Valve 125-135 is a high-flow, single-stage power valve designed to optimize fuel delivery across your engine's RPM range, ensuring crisp throttle response and consistent performance from idle through peak boost. If you're running a...HLY125-135- SKU:
- HLY125-135
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-135
$31.96 -
Holley Power Valve 125-105
HOLLEY
$18.22Carburetor tuning hinges on precise vacuum signal management, and the Holley Power Valve 125-105 delivers exactly that. This single-stage valve meters fuel enrichment at the right threshold, preventing lean stumbles during cruise and ensuring clean...HLY125-105- SKU:
- HLY125-105
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 125-105
$18.22 -
AED Power Valve Block-Off Plug 5086
ADVANCED ENGINE DESIGN
$5.72If you're running a Holley or Quick Fuel carburetor and need to eliminate power valve complications, the AED 5086 Block-Off Plug delivers a straightforward solution. This CNC-machined aluminum plug allows you to permanently disable the power valve...AED5086- SKU:
- AED5086
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MFG Part #:
- 5086
$5.72Qty in Cart: 0Quantity:Price:$5.72Subtotal: -
AED 8.5 Power Valve 5085
ADVANCED ENGINE DESIGN
$9.99The AED 8.5 Power Valve 5085 is engineered to optimize fuel distribution and engine efficiency across a wide range of driving conditions. By maintaining precise vacuum-based control, this power valve ensures your engine delivers consistent performance...AED5085- SKU:
- AED5085
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MFG Part #:
- 5085
$9.99
