{"product_id":"6837-4090-392-6-4-small-block-mopar-hemi-gen-iii-fx-series-4cc-dome-top-gen-iii-hemi-forged-piston-set-4-090-inch-bore-pin-dia-0-945-comp-height-1-21","title":"DSS Racing FX Series +4cc Dome Forged Piston Set 4.090\" Bore: Fits most Hemi Models","description":"\u003ch3\u003eDSS Racing FX Series Forged Piston Set\u003c\/h3\u003e\u003cp\u003eFits Chrysler, Dodge, Jeep, Ram 6.4L 392 Models\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e1-6837-4090 \/ 2-6837-4090 \/ 3-6837-4090 \/ K1-6837-4090 \/ K2-6837-4090 \/ K3-6837-4090\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe DSS Racing FX Series +4cc Dome Top Forged Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram 6.4L 392 engines. Designed to fit most 6.4L 392 HEMI models, these pistons provide a reliable upgrade for enthusiasts seeking enhanced durability and improved combustion efficiency. With a 4.090\" bore size and a +4cc dome top design, this piston set offers increased compression ratios and optimized power delivery.\u003c\/p\u003e\u003cp\u003eIdeal for builders and racers who demand precision and strength, these pistons support aggressive tuning and higher boost levels while maintaining engine reliability. Whether you are rebuilding your 6.4L HEMI or upgrading for performance gains, the DSS Racing FX Series pistons deliver consistent quality and performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThese forged pistons incorporate advanced engineering to meet the demands of modern high-output Mopar engines. Key features include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e+4cc dome top design for increased compression and improved combustion\u003c\/li\u003e\n\u003cli\u003eCompatible with 4.090\" bore size, fitting most Chrysler\/Dodge\/Jeep\/Ram 6.4L 392 engines\u003c\/li\u003e\n\u003cli\u003eForged construction for superior strength and durability under high stress\u003c\/li\u003e\n\u003cli\u003ePin diameter of .945\" with options for full-floating or press-fit configurations\u003c\/li\u003e\n\u003cli\u003eRing groove dimensions of 1.2mm top and second rings, 3mm oil ring for optimal sealing\u003c\/li\u003e\n\u003cli\u003eComp height of 1.21\" to maintain proper piston-to-head clearance\u003c\/li\u003e\n\u003cli\u003eDesigned for 3.720\" stroke and 6.2\" rod length applications\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios\u003c\/li\u003e\n\u003cli\u003eApproximate compression ratios ranging from 9.94:1 to 12.5:1 depending on chamber size\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eConstruction \u0026amp; Design:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight design and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under extreme operating conditions.\u003c\/p\u003e\u003cp\u003eThe dome top design increases the combustion chamber volume by +4cc, which helps optimize the compression ratio for improved power output and throttle response. Precision machining ensures tight tolerances for a perfect fit in the cylinder bore, while the ring grooves are engineered to accommodate high-performance piston rings for superior sealing and oil control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Fitment:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines with a 4.090\" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on your build, you can choose between full-floating or press-fit wrist pins to match your connecting rods and performance goals.\u003c\/p\u003e\u003cp\u003eDue to the +4cc dome volume and specific comp height, it is important to verify piston-to-valve clearance and deck height during assembly. Professional installation is recommended to ensure optimal performance and longevity.\u003c\/p\u003e\u003cp\u003eWhat’s Included\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSet of forged aluminum pistons (quantity as per engine requirements)\u003c\/li\u003e\n\u003cli\u003eWrist pins (.945\" diameter), available in full-floating or press-fit options\u003c\/li\u003e\n\u003cli\u003ePrecision-machined piston rings (1.2mm top and second rings, 3mm oil ring)\u003c\/li\u003e\n\u003cli\u003eInstallation instructions and technical specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIdeal For:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis piston set is perfect for performance enthusiasts, engine builders, and racers upgrading or rebuilding their 6.4L 392 HEMI engines. Whether you are aiming for increased horsepower, improved throttle response, or enhanced engine durability under high-stress conditions, the DSS Racing FX Series pistons provide a reliable foundation for your build.\u003c\/p\u003e\u003cp\u003eThey are especially suited for naturally aspirated, supercharged, or turbocharged applications where strength and precision are critical.\u003c\/p\u003e","brand":"DSS Racing","offers":[{"title":"FX-1 4032 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381017821396,"sku":"1-6837-4090","price":739.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381017854164,"sku":"2-6837-4090","price":769.95,"currency_code":"USD","in_stock":true},{"title":"FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs \/ Pistons - Pins and Locs Without Rings","offer_id":47381017886932,"sku":"3-6837-4090","price":959.95,"currency_code":"USD","in_stock":true},{"title":"FX-1 4032 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381017919700,"sku":"K1-6837-4090","price":937.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381017952468,"sku":"K2-6837-4090","price":967.95,"currency_code":"USD","in_stock":true},{"title":"FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381017985236,"sku":"K3-6837-4090","price":1147.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/8542\/1268\/files\/0002059_4_02b6ce39-2175-46dd-bc2c-30707502f6ab.webp?v=1771666999","url":"https:\/\/fasthemis.com\/products\/6837-4090-392-6-4-small-block-mopar-hemi-gen-iii-fx-series-4cc-dome-top-gen-iii-hemi-forged-piston-set-4-090-inch-bore-pin-dia-0-945-comp-height-1-21","provider":"FastHemis","version":"1.0","type":"link"}