{"product_id":"lower-valve-retainer-for-raptor-valve-train-superseded-by-692194","title":"Lower Valve Retainer for Raptor Valve Train (Superseded by 692194)","description":"\u003cp\u003eValves demand unyielding support—this lower retainer provides it for Raptor systems. It caps the spring securely, ensuring lift without deviation. SKU: 555039, superseded by 692194.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStable Retention: Prevents bounce at high RPMs.\u003c\/li\u003e\n\u003cli\u003eCompatible Fit: Works with dual spring configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe payoff is better airflow, leading to increased velocity on straights. Keep your valve components organized for efficient overhauls.\u003c\/p\u003e\u003cp\u003eRacers appreciate its role in sustaining performance over long heats.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why has this part been superseded by 692194?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Briggs \u0026amp; Stratton periodically updates part numbers to reflect design improvements or manufacturing consolidations. The 692194 retainer is the current, direct replacement for the 555039 and is fully compatible with your Raptor valve train requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this retainer work with stock and aftermarket springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this lower valve retainer is designed to work with standard and dual spring configurations, providing the necessary seat for consistent valve lift.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does a new lower valve retainer improve engine performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A secure, properly seated retainer prevents valve bounce at high RPMs. By ensuring the spring remains stable, you maintain optimal valve timing and airflow, which is critical for sustaining power on long straights.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I replace my valve retainers during a top-end rebuild?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. During an engine overhaul, it is best practice to inspect your valve train components for wear. Replacing the retainers ensures that your springs are properly supported, preventing potential failure during high-heat racing conditions.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/397135-carburetor-choke-style-397135\"\u003eBriggs \u0026amp; Stratton Raptor Flathead 397135 Choke-Style Carburetor - 5HP L-Head - Unrestricted Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/55507-10pack-035-top-ring-55507\"\u003ePack of 10 Precision 035 Top Rings for Raptor Engines\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/55505-10pack-015-top-ring-55505\"\u003eBriggs \u0026amp; Stratton Raptor .015\" Top Piston Rings (10-Pack) - Flathead Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/55506-10pack-025-top-ring-55506\"\u003eBulk 10-Pack .025\" Top Rings for Oversized Raptor Piston Applications\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/555675-piston-assembly-020-supersedes-555481-555675\"\u003eBriggs \u0026amp; Stratton Raptor .020\" Oversize Piston Assembly - 555675 - WKA\/IKF Legal\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SwiftKarting","offers":[{"title":"Default Title","offer_id":48157925343491,"sku":"555039","price":4.45,"currency_code":"USD","in_stock":true}],"url":"https:\/\/phishstonesproducts.myshopify.com\/products\/lower-valve-retainer-for-raptor-valve-train-superseded-by-692194","provider":"PhishStones Products","version":"1.0","type":"link"}