{"product_id":"kb151030-keith-black-pistons-in-our-pistons-department","title":"KB151030 Keith Black Pistons in our Pistons Department","description":"\u003cp\u003eTechnical Specs: Alloy: Hypereutectic 390 Bore: 4.030'' Crankshaft Stroke: 3.500'' Connecting Rod Length: 5.956'' Deck Height: 9.500'' Compression Height: 1.774'' Pin Size: 0.9122'' Pin Location: Centered Flat Top: -6.5cc 2V Relief Intake Valve Relief: 0.257'' Depth \/ 2.120'' Diameter Exhaust Valve Relief: 0.247'' Depth \/ 1.880'' Diameter Top Landing Height: 0.275'' Ring Grooves: 5\/64'' Top; 5\/64'' Middle; 3\/16'' Bottom Gram Weight: 628\/143 Compression Ratio: 11.5:1 w\/55cc Heads; 10.8:1 w\/60cc Heads; 10.3:1 w\/64cc; 9.7:1 w\/69cc Heads For blocks 1971-up.\u003c\/p\u003e\u003cp\u003eBlocks pre-1971 are .020'' shorter, not enough stock to clean up.\u003c\/p\u003e","brand":"United Engine \u0026 Machine Co","offers":[{"title":"Default Title","offer_id":51748954833178,"sku":"SLVKB151.030","price":76.58,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/8942\/8506\/files\/51o65i27TvL_18c94372-5d64-420c-a895-7086ee546ed2.jpg?v=1772041804","url":"https:\/\/trybeepbeep.com\/products\/kb151030-keith-black-pistons-in-our-pistons-department","provider":"TryBeepbeep","version":"1.0","type":"link"}