Eagle Chevrolet LSX Bowtie Block

Nov 02, 2023

The LSX Bowtie Block from Eagle Chevrolet is an excellent choice for those looking to build a high-performance engine. Delivering professional racing-level strength and entry-level affordability, this durable iron-block casting is based primarily on GM's production LS7 block, but designed with more material in key areas — including thicker deck and bores — to support displacements of 454 cubic inches or more.

Unique six-bolts-per-cylinder-head-clamping capability 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" 800 horse bracket racer engine, or a 1,700 horsepower turbo engine for an Outlaw racer, the LSX Bowtie block is the foundation for a solid combination at an affordable 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 .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 .145″ minimum wall thickness (naturally aspirated applications) • Head bolt holes can be machined for 1/2″ studs • 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 • Cam bores can be machined to accept 60mm roller bearings • Can be machined for larger diameter lifters and/or 1.060″ bronze bushings • 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

For more information: https://www.chevrolet.com/performance-parts/components/engine/ls-lt-lsx-series-blocks/lsx-bowtie-blocks