{"product_id":"speed-kit-420-hemi-engines-stage-4","title":"Speed Kit, 420 Hemi Engines Stage 4","description":"\u003cdiv\u003e\n\u003cstrong\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003ca href=\"https:\/\/gokartsusa.biz\/pages\/speed-kit-selection-guide\" title=\"Speed Kit Selection Guide\" style=\"background-color: rgb(255, 255, 0);\"\u003eSpeed Kit Selection Guide\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eThe Stage 4 kit starts with a package similar to that of the\u003cspan\u003e \u003c\/span\u003e\u003cb\u003eStage 3\u003c\/b\u003e, but adds a ported and milled hemi head with stainless valves, a stud kit, and heavy duty valve train components. This kit allows up to 35+ HP out of a 420!\u003cbr\u003e\u003cbr\u003e\u003cb\u003e\u003cspan\u003eKit Includes:\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eFully Ported HEMI Race Head\u003c\/li\u003e\n\u003cli\u003eHigh Flow 40mm \/ 34mm Valves with Lash Caps\u003c\/li\u003e\n\u003cli\u003eDual Springs with Titanium Retainers\u003c\/li\u003e\n\u003cli\u003e307 Race Cam\u003c\/li\u003e\n\u003cli\u003eShaft Mounted Roller Rockers\u003c\/li\u003e\n\u003cli\u003eChrome Moly Pushrods\u003c\/li\u003e\n\u003cli\u003eChoice of Carbs\u003cspan\u003e \u003c\/span\u003e\u003ci\u003e(Or use your own)\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003eForged Flat-Top Piston with Rings\u003c\/li\u003e\n\u003cli\u003eBillet Rod\u003cspan\u003e \u003c\/span\u003e\u003ci\u003e(+.040\" Longer)\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003eOffset Timing Key\u003c\/li\u003e\n\u003cli\u003eCarb, Insulator, Head, Valve Cover, and Case Gaskets\u003c\/li\u003e\n\u003cli\u003eARP Bolt Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cb\u003e*Note:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003ePicture is for reference only and may show optional parts. See above description for actual content. Filter should be sprayed with K\u0026amp;N type oil, especially in dirt applications. These kits are intended for experienced engine builders. Some clearancing, fitment, or other engine building \"tricks\" may be needed. Billet aluminum flywheel required.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003ci\u003eDue to the head work required for this kit, please allow 1 week to ship.\u003c\/i\u003e\u003c\/span\u003e\u003c\/div\u003e","brand":"GoKarts USA®","offers":[{"title":"None (Customer To Supply Carb \/ No Flywheel","offer_id":43110532153403,"sku":"NR-STAGE4KIT420-H","price":895.0,"currency_code":"USD","in_stock":true},{"title":"None (Customer To Supply Carb \/ Add Aluminum Flywheel - Recoil Start","offer_id":43110532186171,"sku":"NR-STAGE4KIT420-H","price":1061.0,"currency_code":"USD","in_stock":true},{"title":"None (Customer To Supply Carb \/ Add Aluminum Flywheel - Electric Start","offer_id":43110532218939,"sku":"NR-STAGE4KIT420-H","price":1118.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ No Flywheel","offer_id":43110532251707,"sku":"NR-STAGE4KIT420-H","price":1123.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43110532284475,"sku":"NR-STAGE4KIT420-H","price":1289.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43110532317243,"sku":"NR-STAGE4KIT420-H","price":1289.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ No Flywheel","offer_id":43110532350011,"sku":"NR-STAGE4KIT420-H","price":1125.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43110532382779,"sku":"NR-STAGE4KIT420-H","price":1295.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43110532415547,"sku":"NR-STAGE4KIT420-H","price":1345.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ No Flywheel","offer_id":43110532448315,"sku":"NR-STAGE4KIT420-H","price":1344.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43110532481083,"sku":"NR-STAGE4KIT420-H","price":1511.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43110532513851,"sku":"NR-STAGE4KIT420-H","price":1568.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ No Flywheel","offer_id":43110532546619,"sku":"NR-STAGE4KIT420-H","price":1321.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ Add Aluminum Flywheel - Recoil Start","offer_id":43110532579387,"sku":"NR-STAGE4KIT420-H","price":1487.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ Add Aluminum Flywheel - Electric Start","offer_id":43110532612155,"sku":"NR-STAGE4KIT420-H","price":1544.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/STAGE4KIT420-H-2.png?v=1764893745","url":"https:\/\/gtcracing.com\/products\/speed-kit-420-hemi-engines-stage-4","provider":"GTC Racing","version":"1.0","type":"link"}