{"product_id":"mhp-4-310-4-315-total-seal-ring-set-gas-ported-top-rings-mhp-r4310a","title":"MHP 4.310 - 4.315\" Total Seal Ring Set - Gas Ported Top Rings - MHP-R4310A","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eMoonshine Horsepower Total Seal Ring Set – Part # MHP-R4310A\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is the exact ring pack we run on every\u003ca href=\"https:\/\/shop.moonshineharley.com\/collections\/pistons-and-rings\/products\/mhp-135-pistons-mhp-p4375-135-new-2026-pistons\" title=\"MHP-P4313-135\"\u003e Moonshine Horsepower M8 Stroker 135 pistons\u003c\/a\u003e \u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eand Moonshine Horsepower 131 builds\u003c\/span\u003e, including our famous Ass Eater setup. Spec’d by us and built by Total Seal, the MHP-R4310A combines thin, low-friction rings with modern gas-porting and coating technology for maximum sealing, reduced blow-by, and real durability in high-output Milwaukee-Eight engines.\u003c\/p\u003e\n\u003ch3 class=\"mt-6 mb-2 font-semibold text-xl\" data-streamdown=\"heading-3\"\u003eWhy This Ring Set Works in High-Performance Builds\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eGas-Ported Top Rings\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eInstead of drilling gas ports in the piston (which weakens the top land, especially near valve reliefs), these 0.9 mm top rings have the ports built into the ring itself. Combustion pressure flows through the ports and loads the ring from behind, pushing it firmly against the cylinder wall exactly when cylinder pressure is highest.\u003c\/p\u003e\n\u003cp\u003eBenefits include:\u003c\/p\u003e\n\u003cul class=\"list-disc list-outside whitespace-normal ps-6 marker:text-secondary\" data-streamdown=\"unordered-list\"\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eDramatically improved ring-to-wall seal under load\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eMore even pressure distribution (more ports than typical piston gas-porting)\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eSelf-cleaning action because the ring rotates — ports don’t carbon up like fixed piston ports\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eLess blow-by → cleaner oil, longer oil life, and more power transferred to the crank\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eStronger piston because no ports are drilled in the top land\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThey use Total Seal’s Advanced Profile (AP) process for tighter tolerances and better sealing than conventional rings, and are finished with the \u003cstrong\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eC-33 PVD Chrome Nitride (CrN) face coating\u003c\/span\u003e.\u003c\/strong\u003e This aerospace-grade coating delivers excellent wear resistance and low friction while seating more easily than traditional chrome.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003e0.9 mm Ductile Iron Napier Second Rings\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eThe Napier profile features a sharp-edge design with positive torsional twist. It scrapes oil more effectively than a conventional second ring while reducing parasitic friction. Combined with the thin 0.9 mm width, these second rings help control oil without adding unnecessary drag — important when you’re chasing every horsepower in a stroker.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003e3.0 mm 3-Piece Oil Control Rings (9–12 lb tension)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eModern oil-ring tension in the 9–12 lb range provides solid oil control without the high parasitic drag of older 15–20+ lb rings. Lower tension means less friction and heat, while the 3-piece design still keeps oil where it belongs in a high-output engine.\u003c\/p\u003e\n\u003ch3 class=\"mt-6 mb-2 font-semibold text-xl\" data-streamdown=\"heading-3\"\u003eKey Advantages for M8 Stroker \/ High-Horsepower Applications\u003c\/h3\u003e\n\u003cul class=\"list-disc list-outside whitespace-normal ps-6 marker:text-secondary\" data-streamdown=\"unordered-list\"\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eThin 0.9 mm top and second rings reduce mass and friction compared to thicker traditional rings → more usable power and better high-RPM behavior\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eSuperior sealing under high cylinder pressure (naturally aspirated or with power adders)\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eReduced blow-by keeps combustion gases out of the crankcase and protects oil\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eDurable materials and coatings built for sustained high-output use\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eProven combination we trust in our own Moonshine Horsepower Stroker 135 engines \u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eand all of our Moonshine Horsepower 131 builds, including the Ass Eater\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-1 [\u0026amp;\u0026gt;p]:inline\" data-streamdown=\"list-item\"\u003eDesigned as a matched set for the MHP M8 Stroker 135 pistons and used across our 131 lineup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"mt-6 mb-2 font-semibold text-xl\" data-streamdown=\"heading-3\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 flex flex-col gap-2 rounded-lg border border-border bg-sidebar p-2\" data-streamdown=\"table-wrapper\"\u003e\n\u003cdiv class=\"border-collapse overflow-x-auto overflow-y-auto rounded-md border border-border bg-background\"\u003e\n\u003ctable class=\"w-full divide-y divide-border\" data-streamdown=\"table\"\u003e\n\u003cthead class=\"bg-muted\/80\" data-streamdown=\"table-header\"\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003cth class=\"whitespace-nowrap px-4 py-2 text-left font-semibold text-sm\" data-streamdown=\"table-header-cell\"\u003eComponent\u003c\/th\u003e\n\u003cth class=\"whitespace-nowrap px-4 py-2 text-left font-semibold text-sm\" data-streamdown=\"table-header-cell\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody class=\"divide-y divide-border\" data-streamdown=\"table-body\"\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eTop Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e0.9 mm Advanced Profile Gas Ported, C-33 CrN PVD coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eSecond Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e0.9 mm Ductile Iron Napier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eOil Control\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e3.0 mm 3-piece, 9–12 lb tension\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003ePart Number\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003eMHP-R4310A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-border\" data-streamdown=\"table-row\"\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003e\u003cspan class=\"font-semibold\" data-streamdown=\"strong\"\u003eApplication\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"px-4 py-2 text-sm\" data-streamdown=\"table-cell\"\u003eMHP M8 Pistons (4.310\"-4.315\" bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThis is not a generic ring pack. It is the combination we use when we want maximum seal, minimum friction, and long-term reliability in high-performance M8 stroker and 131 builds. Proper cylinder finish (we recommend our CNC Rottler hone process) is critical to getting the full benefit of these rings.\u003c\/p\u003e","brand":"Moonshine Harley-Davidson","offers":[{"title":"Default Title","offer_id":68085218607291,"sku":"MHP-R4310A","price":165.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0101\/8085\/3857\/files\/P1341915.jpg?v=1793656911","url":"https:\/\/shop.moonshineharley.com\/products\/mhp-4-310-4-315-total-seal-ring-set-gas-ported-top-rings-mhp-r4310a","provider":"Moonshine Harley-Davidson","version":"1.0","type":"link"}