Description

CONCEPT PERFORMANCE MACHINED ALUMINUM BLOCK

Brand new Chevrolet Racing LSR blocks are CNC bored and CNC decked by Late Model Engines (LME) in Houston TX. Block is final honed to your specification randing from 4.000″ to 4.200″ bore for optimal ring seal and oil retention for high performance applications, final decked for optimal gasket retention to your choice of 9.240″ height, and main bores are final align honed for maximum bearing clearances.

ARP Main Studs P/N 234-5608 are installed on every block prior to final align honing of mains and are included in the price.
Delivering the seemingly impossible combination of professional racing-level strength and entry-level affordability, the LSR 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 thicker deck and bores ? to support displacements of 454 cubic inches or more, and unique six-bolts-per-cylinder-head 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.

LSR Block

? 4.125″ finished siamese cylinder bores
? 9.240″ finished standard deck height
? 4.250″ maximum stroke (professional engine builders only!)
? Capable of 320- to 454-cubic-inch displacements
? Orange powder-coated finish
? Accepts all LS and LSX Series heads, cranks, cams, etc.
? Approximate finished weight is 120 pounds

LSR Block specs and features include:

? CNC-machined aluminum 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