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!