Because the LSX Bowtie Block is based on production LS blocks, all LS-Series Gen IV cylinder heads, crankshafts, oil pans, camshafts, and accessories bolt right to it. There's a tall deck version to build larger engines, and Chevrolet Performance even offers the LSX Bowtie Block semi-finished so you can do it your way. Whether building a ''tame'' 500 HP street engine for your hot rod or a 1,700 HP turbo engine for an Outlaw drag racer, the LSX Bowtie Block is the foundation for an unbeatable combination at an unbeatable price!

LSX Bowtie Block Specifications

• CNC-machined cast iron block
• True priority main oiling
• 6-head bolts per cylinder
• Standard 4.400'' bore spacing
• Extra-thick siamese cylinder bores
• Semi-finished, machined thicker decks
• LS7-style, 6-bolt dowel-located billet main bearing caps
• Wet-sump and dry-sump oiling capability
• Production-style deep-skirt head bolt holes
• Production bolt hole and thread sizes
• Maintains production exterior accessory mounting provisions
• Front motor plate mounting holes added
• Additional material cast around cam bearings for greater strength
• 8mm exterior/interior fifth- and sixth-head bolt holes
• Standard 0.842'' lifter bores
• Accommodates all LS oil pumps and oil pans
• External oil pump feed (rear of block)
• Main web bay-to-bay breathing holes to support greater horsepower
• Includes unique cam retainer, rear cover and lifter retainers
• Powdercoated orange For the advanced competition engine builder, the new LSX Bowtie Block also features:
• Front oil feed holes can be plugged/restricted for mechanical flat tappet or mechanical roller lifter applications
• Can be machined safely to 9.200'' deck height
• Maximum 4.200'' bore at .200'' minimum wall thickness (naturally aspirated applications)
• Head bolt holes can be machined for 1/2'' studs
• Cam bores can be machined to accept 60mm roller bearings
• Can be machined for larger diameter lifters and/or 1.060'' bronze bushings
• Front oil feed lines can be plugged and external oil pump and/or aftermarket dry sump systems can be used via oil pump feed at rear of block (may be required with certain large stroke/aluminum rod combinations)
• Belt cam drive systems can be accommodated (some machining will be required)
• Front motor plate can be used for racing chassis applications (Sprint Car, drag racing, truck pulling, etc.)
• Threaded water plugs can be used for external heaters or coolers
• Extra stock for main bearing align-honed
• 400 mPa Tensile strength iron JEGS Easy Kits are designed by JEGS professionals so you get all the parts you need!