{"product_id":"6840-4090-6-1-small-block-mopar-hemi-gen-iii-fx-series-1-5cc-flat-top-gen-iii-hemi-forged-piston-set-4-090-inch-bore-pin-dia-0-927-comp-height-1-21","title":"DSS Racing FX Series Gen III Hemi Forged Piston Set 4.090\" Bore: Chrysler \/ Dodge \/ Jeep (6.1L SRT8)","description":"\u003ch3\u003eDSS Racing FX Series Gen III Hemi Forged Piston Set\u003c\/h3\u003e\u003cp\u003eFits Most Chrysler \/ Dodge \/ Jeep \/ Ram 6.1L SRT8 Models\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e1-6840-4090D \/ 2-6840-4090D \/ 3-6840-4090D \/ K1-6840-4090D \/ K2-6840-4090D \/ K3-6840-4090D\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.1L SRT8 engine. Designed to handle the rigors of high-performance applications, these pistons offer exceptional strength and durability while maintaining optimal weight for improved engine response. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers precision fitment and performance consistency.\u003c\/p\u003e\u003cp\u003eIdeal for enthusiasts and professional builders alike, these pistons support aggressive tuning and increased boost levels, making them a reliable choice for street, strip, or track use. Their forged construction ensures superior resistance to heat and stress compared to cast pistons, providing peace of mind under demanding conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBuilt to exacting standards, the DSS Racing FX Series pistons incorporate advanced design elements to maximize performance and longevity:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with 4.090\" bore size for most 6.1L SRT8 engines\u003c\/li\u003e\n\u003cli\u003eForged construction for enhanced strength and durability\u003c\/li\u003e\n\u003cli\u003eFlat top design with a -1.5cc dish for optimized combustion chamber volume\u003c\/li\u003e\n\u003cli\u003eCompression height of 1.21\" tailored for Gen III Hemi applications\u003c\/li\u003e\n\u003cli\u003e.927\" wrist pin diameter with options for full-floating or press-fit installation\u003c\/li\u003e\n\u003cli\u003eRing groove dimensions: 1.2mm top and second rings, 3mm oil ring for effective sealing\u003c\/li\u003e\n\u003cli\u003eStroke compatibility of 3.578\" and connecting rod length of 6.243\" for precise engine geometry\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple combustion chamber volume options to suit different compression ratios (65cc, 74cc, 85cc)\u003c\/li\u003e\n\u003cli\u003eDesigned to support compression ratios ranging approximately from 9.06:1 to 11.2:1\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eConstruction \u0026amp; Design:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEach piston in the FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight construction and mechanical strength. The forging process refines the metal grain structure, resulting in pistons that resist cracking and deformation under extreme thermal and mechanical loads. The flat top with a slight dish enhances combustion efficiency and helps control detonation in high-compression setups.\u003c\/p\u003e\u003cp\u003eThe pistons feature precision-machined ring grooves and pin bores to ensure optimal sealing and minimal friction. The option for full-floating or press-fit wrist pins allows builders to tailor the assembly to their specific engine build and performance goals. This attention to detail in design and manufacturing ensures reliable operation in demanding environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Fitment:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThese pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.090\" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on the wrist pin option selected, either full-floating or press-fit installation methods should be followed according to engine builder preferences and specifications.\u003c\/p\u003e\u003cp\u003eDue to their precise dimensions and compatibility, these pistons fit seamlessly into Gen III Hemi configurations without the need for extensive modifications, making them an excellent choice for performance upgrades or engine rebuilds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSet of forged pistons sized for 4.090\" bore\u003c\/li\u003e\n\u003cli\u003eWrist pins (full-floating or press-fit depending on SKU)\u003c\/li\u003e\n\u003cli\u003eRing grooves machined to accept 1.2\/1.2\/3mm piston rings (rings not included)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIdeal For:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis piston set is ideal for performance enthusiasts, professional engine builders, and racers seeking a durable, high-quality piston solution for the 6.1L SRT8 engine platform. It supports high compression and aggressive tuning, making it suitable for street performance, drag racing, road racing, and other motorsport applications where reliability and power are paramount.\u003c\/p\u003e","brand":"DSS Racing","offers":[{"title":"FX-1 4032 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381013889236,"sku":"1-6840-4090D","price":689.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381013922004,"sku":"2-6840-4090D","price":719.95,"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":47381013954772,"sku":"3-6840-4090D","price":899.95,"currency_code":"USD","in_stock":true},{"title":"FX-1 4032 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381013987540,"sku":"K1-6840-4090D","price":867.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381014020308,"sku":"K2-6840-4090D","price":897.95,"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":47381014053076,"sku":"K3-6840-4090D","price":1087.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/8542\/1268\/files\/0002076_4_816dc1f0-7e0f-482b-938a-5966d19e6e71.webp?v=1771667006","url":"https:\/\/fasthemis.com\/products\/6840-4090-6-1-small-block-mopar-hemi-gen-iii-fx-series-1-5cc-flat-top-gen-iii-hemi-forged-piston-set-4-090-inch-bore-pin-dia-0-927-comp-height-1-21","provider":"FastHemis","version":"1.0","type":"link"}