{"product_id":"gm-performance-gm12498772-7-chev-383-cu-crate-motor-420hp","title":"GM Performance GM12498772-7 Chev 383 Cu Crate Motor 420Hp","description":"\u003cul\u003e\n\u003cli\u003e4 bolt main 1pc rear seal block with drivers side dipstick only \u003c\/li\u003e\n\u003cli\u003eSquare and parallel decked \u003c\/li\u003e\n\u003cli\u003e Align honed main bearing bore \u003c\/li\u003e\n\u003cli\u003eCylinders honed on computer controlled machine to within .0002\" straightness and roundness \u003c\/li\u003e\n\u003cli\u003e Cylinders are sonic tested for thickness \u003c\/li\u003e\n\u003cli\u003eNew cast steel crankshaft \u003c\/li\u003e \u003cli\u003eFlat top Hypereutectic pistons \u003c\/li\u003e\n\u003cli\u003eChevy heavy beam rods with 150,000 psi bolts \u003c\/li\u003e\n\u003cli\u003eHastings Moly rings \u003c\/li\u003e\n\u003cli\u003eBalanced rotating assembly \u003c\/li\u003e\n\u003cli\u003e Melling high volume oil pump \u003c\/li\u003e\n\u003cli\u003eFlat tappet camshaft \u003c\/li\u003e\n\u003cli\u003eLong slot, stamped steel rockers \u003c\/li\u003e\n\u003cli\u003eHeavy duty double roller timing set \u003c\/li\u003e\n\u003cli\u003eBlue Print aluminium cylinder heads \u003c\/li\u003e\n\u003cli\u003e195cc \u003c\/li\u003e\n\u003cli\u003e1.25\" diameter valve springs \u003c\/li\u003e\n\u003cli\u003eHardened retainers and springs \u003c\/li\u003e \u003cli\u003e2.02\" swirl polished intake valves \u003c\/li\u003e\n\u003cli\u003e1.60\" swirl polished exhaust valves \u003c\/li\u003e\n\u003cli\u003eHardened push rods \u003c\/li\u003e\n\u003cli\u003e10 to 1 compression \u003c\/li\u003e\n\u003cli\u003eNew chrome valve covers \u003c\/li\u003e\n\u003cli\u003eBrass freeze plugs \u003c\/li\u003e\n\u003cli\u003eDyno tested - and shipped with results \u003c\/li\u003e \u003cli\u003eCAM: .480 Int \/ .486 Exh \u0026amp; 229 Int \/ 230 Exh duration @ .050 \u003c\/li\u003e\n\u003cli\u003e Ignition timing: 34 degrees total (at 4000 RPM) \u003c\/li\u003e\n\u003cli\u003e This engine requires a 400ci weighted harmonic balancer, and late 350ci weighted flexplate\/flywheel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e","brand":"GM Performance","offers":[{"title":"Default Title","offer_id":44882213765431,"sku":"GM12498772-7","price":8981.5,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/9364\/1015\/files\/83055.jpg?v=1780374634","url":"https:\/\/enginemaster.com.au\/products\/gm-performance-gm12498772-7-chev-383-cu-crate-motor-420hp","provider":"Engine Master","version":"1.0","type":"link"}