{"title":"G8X S58 Engine Builds","description":"","products":[{"product_id":"klm-s58-stage-2-engine-build-1-200-whp","title":"KLM S58 Stage 2 Engine Build (1,200 WHP)","description":"\u003cp\u003e\u003cstrong\u003eYou will receive an email after placing this order to confirm freight and final shipping cost.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eStage 2 is where the real upgrades start. If you're already looking at cams and valves for a Stage 1, you're better off here, since Stage 2 isn't a-la-carte parts stacked on a lower tier, it's a complete step up in what the bottom end and head can survive. Rods move to BC I-Beam, stronger under load and built to hold more power. Pistons step up to a higher rated CP-Carrillo spec, and the head gets actual GSC intake and exhaust valves instead of just springs and seals. We also machine the block in-house to accept oversized ARP studs at this stage, standard hardware doesn't cut it once you're pushing this far past factory.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIt is built to safely support tuning up to 1,200 WHP, not a promise that your engine makes 1,200 WHP out of the box. Send us your engine or buy a core from us and we build the whole thing start to finish. Either way it comes back ready to run once it's through break-in.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e\u003cem\u003eKey Specs\u003c\/em\u003e\u003c\/strong\u003e\u003cbr\u003eRated to safely support tuning up to 1,200 WHP.\u003cbr\u003eEvery build follows our researched and validated Stage 2 spec. Individual engines are not dyno tested.\u003cbr\u003eBreak-in period required. Instructions included with every build.\u003cbr\u003eSend in your own engine or purchase a core from KLM for a complete build.\u003cbr\u003eTurnaround is typically 3 to 4 weeks, occasionally longer depending on parts availability and build queue.\u003c\/p\u003e","brand":"KLM Race","offers":[{"title":"Default Title","offer_id":43439746941002,"sku":"KLM-233","price":17799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/5431\/9690\/files\/bf6cce5c-KLM-S58-Stage-2-3.jpg?v=1774364132"},{"product_id":"klm-s58-stage-1-engine-build-1-000-whp","title":"KLM S58 Stage 1 Engine Build (1,000 WHP)","description":"\u003cp\u003e\u003cstrong\u003eYou will receive an email after placing this order to confirm freight and final shipping cost.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis is our baseline for anyone pushing an S58 past what the factory internals were ever built to survive. Stage 1 covers the rotating assembly, head hardware, and sealing, everything that has to hold when boost and timing start climbing. It is built to safely support tuning up to 1,000 WHP, not a promise that your engine makes 1,000 WHP out of the box. That number is a ceiling, and we build with margin above it on purpose.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eSend us your engine or buy a core from us and we build the whole thing start to finish. Either way it comes back ready to run once it's through break-in.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eKey Specs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eRated to safely support tuning up to 1,000 WHP.\u003cbr\u003eEvery build follows our researched and validated Stage 1 spec. Individual engines are not dyno tested.\u003cbr\u003eBreak-in period required. Instructions included with every build.\u003cbr\u003eSend in your own engine or purchase a core from KLM for a complete build.\u003cbr\u003eTurnaround is typically 3 to 4 weeks, occasionally longer depending on parts availability and build queue.\u003cbr\u003e\u003c\/p\u003e","brand":"KLM Race","offers":[{"title":"Default Title","offer_id":43439747563594,"sku":"KLM-232","price":12999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/5431\/9690\/files\/3585cb1b-KLM-S58-Stage-1.jpg?v=1774364133"},{"product_id":"klm-s58-stage-3-engine-build-1-300-whp","title":"KLM S58 Stage 3 Engine Build (1,300 WHP)","description":"\u003cp\u003e\u003cstrong\u003eYou will receive an email after placing this order to confirm freight and final shipping cost.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eStage 3 keeps the factory 3.0L stroke and shifts the focus to the head. We do 5-axis CNC porting in-house along with a full valve job, smoother ports, less turbulence, better seal, more air moving through the head at the same displacement. Rods, pistons, bearings, and cams carry over from Stage 2, and oversized ARP studs with the in-house machining that fits them carry through as well.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIt is built to safely support tuning up to 1,300 WHP, not a promise that your engine makes 1,300 WHP out of the box. Send us your engine or buy a core from us and we build the whole thing start to finish. Either way it comes back ready to run once it's through break-in.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e\u003cem\u003eKey Specs\u003c\/em\u003e\u003c\/strong\u003e\u003cbr\u003eRated to safely support tuning up to 1,300 WHP.\u003cbr\u003eEvery build follows our researched and validated Stage 3 spec. Individual engines are not dyno tested.\u003cbr\u003eBreak-in period required. Instructions included with every build.\u003cbr\u003eSend in your own engine or purchase a core from KLM for a complete build.\u003cbr\u003eTurnaround is typically 3 to 4 weeks, occasionally longer depending on parts availability and build queue.\u003cbr\u003e\u003c\/p\u003e","brand":"KLM Race","offers":[{"title":"Default Title","offer_id":43465063759946,"sku":null,"price":20999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/5431\/9690\/files\/f0e4b4b7-S58-Stage-3.jpg?v=1774364137"},{"product_id":"klm-s58-stage-4-savage-engine-build-1-500-whp","title":"KLM S58 Stage 4 SAVAGE Engine Build (1,500 WHP)","description":"\u003cp\u003e\u003cstrong\u003eYou will receive an email after placing this order to confirm freight and final shipping cost.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIf you're building a Stage 4, we already know what you're doing. This is drag car territory, or you're chasing a number most S58 owners will never see. This is our peak build, the one we throw everything at because anything less won't survive what you're about to put it through. Displacement moves to a 3.2L stroker as standard, not an add-on. Pistons are KLM Custom Spec, made to our own spec, not a catalog part with a rating stamped on the box. The head gets our KLM Spec modification, welding and machining to reinforce it beyond what the casting can handle stock, on top of the same 5-axis CNC porting from Stage 3. At 1,500 plus whp, the head has to survive just as hard as the bottom end.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eSend us your engine or buy a core from us and we build the whole thing start to finish. Either way it comes back ready to run once it's through break-in.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e\u003cem\u003eKey Specs\u003c\/em\u003e\u003c\/strong\u003e\u003cbr\u003eRated for 1,500+ WHP. Our own shop car and several customer builds are currently running in the 1,600 whp range on this spec.\u003cbr\u003eThis is our current peak build level. No stage above this exists.\u003cbr\u003eEvery build follows our researched and validated Stage 4 spec. Individual engines are not dyno tested.\u003cbr\u003eBreak-in period required. Instructions included with every build.\u003cbr\u003eSend in your own engine or purchase a core from KLM for a complete build.\u003cbr\u003eTurnaround is typically 3 to 4 weeks, occasionally longer depending on parts availability and build queue.\u003cbr\u003e\u003c\/p\u003e","brand":"KLM Race","offers":[{"title":"Default Title","offer_id":43439748481098,"sku":"KLM-235","price":27499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/5431\/9690\/files\/067ec23e-S58-Stage-4-SAVAGE.jpg?v=1774364140"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/5431\/9690\/collections\/Knole_Car.jpg?v=1775059088","url":"https:\/\/www.klmrace.com\/collections\/g8x-s58-builds.oembed","provider":"KLM Race","version":"1.0","type":"link"}