LSX Bowtie Block

LSX Bowtie Block

Delivering the seemingly impossible combination of professional racinglevel strength and entry-level affordability, the LSX Bowtie Block is the next revolution in high-performance engine-building. This durable iron-block casting is based primarily on GM’s production LS7 block, but designed with more material in key areas – including a thicker deck and bores – to support displacements of 454 cubic inches or more, and unique six-bolts-per-cylinderhead-clamping capability that enables forced-induction and nitrous combinations of greater than 2,000 horsepower.

Because the LSX Bowtie block is based on production LS blocks, all of the LS-Series Gen IV cylinder heads, crankshafts, oil pans, camshafts, and accessories bolt right up to it. There is also a tall-deck version for building even larger engines. Chevrolet Performance delivers the LSX Bowtie Block semi-finished, allowing you to finish it to your needs. Whether you’re building a “tame” 500-horse street engine for your hot rod or a 1,700 horsepower 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 specs and features include:

• 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

For the advanced LSX competition engine builder, you will fully enjoy the following features of the new LSX Bowtie Block:

• 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