en-us Wed, 07 Oct 2026 00:30:06 GMT 184492229 https://motorheadmedia.com/long-block/184492229/4-500-hp-rated-462ci-billet-ls-long-block.html This billet LS long block uses a highly optimized, but well-proven LS architecture. The parts are from manufacturers of proven quality, but replacements can be sourced from alternate vendors if the need ever arises. This mitigates the risk of total reliance on a single vendor with their own exotic engine design and sole-source, proprietary parts. Proven conventional architecture also beats exotic in cost, size, weight and complexity. If conventional works just as well, why would you want to…

]]> Engines: GM/Chevrolet: Long Block Sun, 04 Oct 2026 07:50:06 GMT 184430081 https://motorheadmedia.com/long-block/184430081/boost-ready-big-block-chevy-555ci-long-block.html PHOTOS INCLUDE OPTIONAL BILLET INTAKE MANIFOLD This 555 cubic inch BBC long block is built to handle serious boost. It features top quality parts conbined with precision CNC machining and assembly that was recognized by Engine Builder Magazine's with their top award. The foundation is a Dart Big M, 10.2 inch tall-deck block with billet steel main caps for extraordinary strength. The block undergoes multiple machining steps on our 4-axis CNC which has a precision of 0.0002 inches before moving…

]]> Engines: GM/Chevrolet: Long Block Sat, 03 Oct 2026 07:50:08 GMT 184630056 https://motorheadmedia.com/long-block/184630056/370ci-ls3-port-iron-long-block-630hp.html This digitally remastered 370 cubic inch LS long block delivers a lot of bang for the buck. Our CNCs have machined these seasoned GM block, crank and heads to far beyond their original condition. Pairing these parts with superior quality aftermarket components allows us to pull out 630 horsepower on pump gas at a budget friendly price. The 6.0L iron GM blocks are bored and decked on our 4-axis which boasts a precision of 0.0002" and 1/1,000th of a degree. We also engrave and serialize the blocks…

]]> Engines: GM/Chevrolet: Long Block Fri, 02 Oct 2026 07:50:06 GMT 184127686 https://motorheadmedia.com/long-block/184127686/boost-ready-370ci-ls-long-block-afr-ls3-cnc-d-heads.html Looking for some serious power at a great price? Look no further! This 370ci boost-ready LS long block is designed to easily handle more than 1,000 hp. The AFR, LS3, 6-bolt, 12-degree valve angle castings provide great airflow and were built to handle boost. Our process for machining these heads includes CNC porting and combustion chamber machining on our 5-axis with CNC valve job and bowl bowl blend on our Newen CNC seat & guide machine (see Engine Machining playlist on our YouTube channel…

]]> Engines: GM/Chevrolet: Long Block Fri, 02 Oct 2026 07:50:06 GMT 184753431 https://motorheadmedia.com/long-block/184753431/dart-shp-ls-next-iron-long-block-mechanical-roller-lifters.html Our 427ci mechanical-roller, iron LS long blocks come in two primary flavors: conventional or copper head gaskets. This build uses Cometic MLX gaskets which have a max boost rating of 35 psi. Copper head gaskets with fuel hoops will hold far more pressure, but may require occasional torque adjustments. Those long blocks have a different part selection to better work with the higher boost levels. The top of our LS horsepower ladder is the 462ci billet aluminum long block. This long block is…

]]> Engines: GM/Chevrolet: Long Block Wed, 30 Sep 2026 07:50:06 GMT 184683036 https://motorheadmedia.com/long-block/184683036/555ci-bbc-long-block-hydraulic-roller-na-street.html This high quality, 555 cubic inch Big Block could be a big upgrade to your ride. This long block can either replace what you now have or be the foundation for a new custom build. We keep these long blocks in stock so it can be yours now. These long blocks feature a Dart block and Dart cylinders heads that we machine on our 5-axis CNC from porter castings. The head finish machining processes includes a CNC valve with bowl blending. The rotating assembly consistes of a Callies’ crank and rod…

]]> Engines: GM/Chevrolet: Long Block Wed, 30 Sep 2026 07:50:06 GMT 184665162 https://motorheadmedia.com/long-block/184665162/408ci-ls-long-block-for-na-720hp.html Is your project ready for its new LS? Our standard build 408 puts out 720 hp naturally aspirated. No supercharger or crazy cam needed. We get these results from our precision CNC machining, parts selection and tune. If you watch the videos in our @borowskirace YouTube Machining Playlist, you'll better understand how we put up such big numbers on this engine. The short block starts with a seasoned GM 6.0L block that we have digitally remastered to better than new condition. The mains are…

]]> Engines: GM/Chevrolet: Long Block Wed, 30 Sep 2026 07:50:06 GMT 182199578 https://motorheadmedia.com/long-block/182199578/dart-ls-hydr-roller-long-block-callies-diamond-all-pro.html This hydraulic roller long block is rated to 2,000 hp. We switch to a mechanical roller cam and Jesel shaft rocker system at anything over 2,000 crank horsepower, so that's a different long block. But let's focus on this one for now. Before getting into the details, check out this ad's video to see what John from Cutaway Racing has to say about this bad boy which he dubbed "Peanut Butter & Jelly". The engine block is the foundation any build. The Dart LS Next design…

]]> Engines: GM/Chevrolet: Long Block Wed, 30 Sep 2026 07:50:06 GMT 184829344 https://motorheadmedia.com/long-block/184829344/ls-6-454-factory-june-1971-.html period correct for 1971 Chevy , sq port heads 026

]]> Engines: GM/Chevrolet: Long Block Tue, 22 Sep 2026 23:24:32 GMT 184827569 https://motorheadmedia.com/long-block/184827569/grudge-boss-6.6l-lt-sleeved-high-boost-long-block.html GRUDGE BOSS 6.6L LT - SLEEVED HIGH-BOOST LONG BLOCK Big 3 Engines / MMRE / GPI | Troup, Texas $21,475 for the advertised base build. No core or exchange required. Freight and any quoted options are additional. A purpose-built LT foundation for a serious boosted project: sleeved 6.6L GPI bottom-end architecture paired with the Shock Factor / RaceKing top-end package, including Katech CNC porting and an application-specific camshaft. BUILD DETAILS - Sleeved 6.6L LT bottom-end architecture. -…

]]> Engines: GM/Chevrolet: Long Block Sat, 12 Sep 2026 06:20:40 GMT 184827568 https://motorheadmedia.com/long-block/184827568/atlas-1-lt-6.2l-long-block-katech-ported-raceking-heads.html BIG 3 / MMRE ATLAS 1 - LT 6.2L PERFORMANCE LONG BLOCK A custom naturally aspirated LT package combining a Shock Factor-based remanufactured bottom end, Silvolite pistons and Katech CNC-ported RaceKing cylinder heads. Advertised long-block package: $12,875. No core or exchange required. BUILD HIGHLIGHTS - Stock-displacement 6.2L remanufactured foundation with Silvolite pistons - Exact crankshaft, rods, bore and compression specified on your build sheet - RaceKing heads with Katech Rottler-CNC…

]]> Engines: GM/Chevrolet: Long Block Sat, 12 Sep 2026 06:12:28 GMT 184827564 https://motorheadmedia.com/long-block/184827564/shock-factor-737-lt-6.2l-long-block-katech-ported-heads.html BIG 3 / MMRE SHOCK FACTOR 737 - LT 6.2L PERFORMANCE LONG BLOCK An airflow-focused LT build with Katech CNC-ported RaceKing cylinder heads and a matched performance valvetrain. Advertised long-block package: $12,777. No core or exchange required. BUILD HIGHLIGHTS - RaceKing One stock-style remanufactured bottom-end foundation - RaceKing heads with Katech Rottler-CNC porting and CHE guides - Manley valves, 1209X springs, titanium retainers and chromoly seats - CHE trunnion rocker upgrade and BTR…

]]> Engines: GM/Chevrolet: Long Block Sat, 12 Sep 2026 06:09:35 GMT