{"product_id":"hypereutectic-piston-set-4-030-bore-flat-top-with-7cc","title":"Hypereutectic Piston Set, 4.030\" Bore, Flat Top with 7cc","description":"The Keith Black KB120-030 piston set is engineered for high-performance builds, including marine, drag race, circle track, street, and towing applications. These hypereutectic pistons are forged from a 390 aluminum alloy with 16% silicon, providing low expansion characteristics for a tighter, more efficient piston-to-wall running clearance. The set includes eight flat-top pistons with a 7cc valve relief, a 4.030-inch bore, and a compression height of 1.561 inches.\n\nKey features include fully machined head and valve reliefs, triple spiral lock rings, and CNC-machined pin bores for precise alignment and sizing. They also incorporate an accumulator groove to aid compression ring seal, machined oil returns, and diamond-finished skirts to reduce scuffing and overheating. Wrist pins and spiral lock rings are included with the set.\n\nThese pistons are designed for SB Chevy 350 engines with a 3.480-inch crankshaft stroke and a 5.700-inch rod length. The advertised piston weight is 587 grams, with a 145-gram wrist pin. Compression ratios vary depending on combustion chamber volume: 10.9:1 for 58cc, 10.4:1 for 62cc, 10.2:1 for 64cc, and 9.0:1 for 76cc chambers. Note that piston rings (5\/64 x 5\/64 x 3\/16) are not included.","brand":"KB","offers":[{"title":"Default Title","offer_id":52662806020408,"sku":"KBPKB120.030","price":334.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687498947.jpg?v=1784321193","url":"https:\/\/store.motormia.co\/products\/hypereutectic-piston-set-4-030-bore-flat-top-with-7cc","provider":"MOTORMIA","version":"1.0","type":"link"}