en-us Sat, 25 Apr 2026 11:26:24 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, 24 Apr 2026 07:50:04 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, 24 Apr 2026 07:50:04 GMT 182254994 https://motorheadmedia.com/long-block/182254994/396-427-454-s-blks-and-heads.html if your looking for a 65 to 75 big block many heads and blks in stk many date codes available contact vintagebigblocks.com david has 300plus in stk or call 716-763-6200 he has your muscle car needs we can complete and dyno them also stevesautoandmachine.com

]]> Engines: GM/Chevrolet: Long Block Fri, 24 Apr 2026 07:50:04 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, 22 Apr 2026 07:50:02 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, 22 Apr 2026 07:50:02 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, 22 Apr 2026 07:50:02 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, 22 Apr 2026 07:50:02 GMT 184782794 https://motorheadmedia.com/long-block/184782794/ls-5.7-chevy-gm-gmc-swap-longblock.html LS 5.3 bored to 5.7 Gen 3 Flattop LS pistons 3.908 bore Custom cam 212dur .538 lifr 112lc 862 heads BTR valve springs

]]> Engines: GM/Chevrolet: Long Block Tue, 21 Apr 2026 19:41:59 GMT 184724620 https://motorheadmedia.com/long-block/184724620/boost-ready-dry-sump-lt4-long-block-376-or-416-ci.html GM's aluminum LT production block has proven itself to be a strong performer. We see this long block as being able to reliably handle to 1,200 hp. That could not be said about its aluminum LS predecessor. We switch to an aftermarket LS block over about 750hp. Aftermarket aluminum blocks are a high-cost upgrade. An LT's design provides a number of other benefits over its LS predecessor. The key characteristic of an LT is direct injection. This provides greater control over the…

]]> Engines: GM/Chevrolet: Long Block Tue, 21 Apr 2026 07:50:03 GMT 182685226 https://motorheadmedia.com/long-block/182685226/borowski-custom-dart-ls-next-aluminum-long-block.html This long block is for someone that wants bulletproof so they won't cringe every time they turn up the boost. Like in the video. The recipe for this piece has further evolved since the video was shot back in 2018. We now use a skirted Dart aluminum LS Next engine block and upgrade it to 1/2" head studs and machine the lifter bores to 0.904" for larger, more robust lifters. Callies has also introduced their new Apex crank line. Its performance is comparable to their Magnum line…

]]> Engines: GM/Chevrolet: Long Block Tue, 21 Apr 2026 07:50:03 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, 19 Apr 2026 07:50:03 GMT 184765898 https://motorheadmedia.com/long-block/184765898/big-block-chevy-567.5-complete-long-block.html For sale is a 567.5 cubic inch Big Block Chevy, professionally built and recently freshened. This is a complete long block from carburetor to oil pan, ready for installation. Specs: Bore: 4.610 Stroke: 4.250 Displacement: 567.5 CID Components: JE Pistons Manley Connecting Rods Callies Crankshaft Morel Lifters Crane Camshaft Quick Fuel Carburetor Build Info: Originally built by Steve Schmidt Recently freshened by High Risk Performance Condition: Complete long block Carburetor to pan Freshened and…

]]> Engines: GM/Chevrolet: Long Block Sat, 11 Apr 2026 15:46:36 GMT