en-us Mon, 25 May 2026 22:08:23 GMT 184785847 https://motorheadmedia.com/short-block/184785847/bbc-565-short-block-10.6-1-merlin-iv-molnar-mahle-in-stock.html IN STOCK NOW to SHIP BBC Assembled Short Block - 565 cid Merlin IV Iron block splayed 4-bolt mains Ductile iron caps with ARP main bolts Designed to fit GM OEM Drop-in Hydraulic Roller Lifters Provisions for OEM cam thrust plate and Lifter retainer 4.600 x 4.250 bore & stroke Internally Balanced (Use NON-Weighted balancer & flywheel) Premiu, Molnar Forged Crankshaft with 8 Counterweights Molnar Billet 4340 Steel H-beam rods Proprietary ARP2000 Rod Bolts with asymmetric threads Mahle 4032…

]]> Engines: GM/Chevrolet: Short Block Sun, 24 May 2026 07:50:02 GMT 184492242 https://motorheadmedia.com/short-block/184492242/4-500-hp-462ci-billet-ls-short-block.html This billet LS short 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 pay…

]]> Engines: GM/Chevrolet: Short Block Sun, 24 May 2026 07:50:02 GMT 184387932 https://motorheadmedia.com/short-block/184387932/555ci-bbc-shortblocks-various-dart-callies-j-e-combos.html Big Block Chevy has long been synonymous with Big Power. These engines are a proven, straightforward way to drop in big power. Borowski Race Engines (BRE) and Dart Machinery's history with BBC race engines goes back to about Day 1 of our common history in the late 60's. We are pleased to offer a range of 555 cubic short blocks using Dart Big M and Sportsman blocks to cover a wide range of applications. These short blocks are built from parts held in inventory so we can deliver them to…

]]> Engines: GM/Chevrolet: Short Block Sun, 24 May 2026 07:50:02 GMT 184151129 https://motorheadmedia.com/short-block/184151129/427-ci-aluminum-ls-short-block-for-na-rhs-std-or-dart-.html Available in either an RHS or Dart aluminum block, this short block is intended for naturally aspirated, pump gas applications. The RHS version includes the required custom timing cover. It is the foundation of our 800 horsepower, naturally-aspirated, pump gas build. This beast can drive to the track and tear it up when it gets there without breaking a sweat as you'll see in this ad's video. The foundation can be an RHS or optional Dart aluminum block. An aluminum block transfers heat better…

]]> Engines: GM/Chevrolet: Short Block Sun, 24 May 2026 07:50:02 GMT 184145797 https://motorheadmedia.com/short-block/184145797/370ci-ls-shortblock-for-boost-with-callies-8-cwt-crank.html This short block is intended for light boost to about 1,100 crank horsepower. The Callies Compstar center counterweighted crank with stock stroke brings a lot to the party. Having 8 instead of 6 counterweights increases stiffness by 25%. Harmonics are reduced because each cylinder has its own two counterweights. These two factors combine to minimize crank flexing thereby protecting the block, bearings and rods from excessive wear and fatigue. We have seen that using 8 counterweight cranks…

]]> Engines: GM/Chevrolet: Short Block Sun, 24 May 2026 07:50:02 GMT 184796015 https://motorheadmedia.com/short-block/184796015/dart-big-m-block.-.html Dart Big M block. The machine work is fully completed and it is ready for assembly. * 9.8 deck height * 4.625 bore * Bushed .842 lifter bores * Coated cam bearings This block is in excellent condition and ready for your build.

]]> Engines: GM/Chevrolet: Short Block Sat, 23 May 2026 17:50:56 GMT 184491588 https://motorheadmedia.com/short-block/184491588/ls-427-short-block-20lb-boost.html We Have (2) of these Currently in Stock LS Assembled Short Block - 427 cid Dart SHP Lunati Crank. Molnar PwrAdr XD Rods CP-Carrillo Boosted Pistons - Good for 20+lb boost. These NEW Dart SHP LS Assembled BOOSTED Short Blocks are the ultimate value for your Chevy LS engine project. These quality component packages are designed to allow you to build powerful and durable engines at a very affordable cost. This 427 cid short block starts with a new Dart SHP iron block and is plate honed for…

]]> Engines: GM/Chevrolet: Short Block Sat, 23 May 2026 07:50:03 GMT 184795935 https://motorheadmedia.com/short-block/184795935/347-stroker-.html SBF 347 stroker. Everything is brand new minus the block is a 89. Scat rotating assembly, XE274HR comp cam, comp cams double roller timing kit, AFR 185cc heads, scorpion 7/16 1.6 rockers, canton 7 qt oil pan, selling HV oil pump, speed master intake. Also comes with a set of BBK longtube headers for foxbody. Just needs finished putting together and needs measured for pushrods. Comes with everything minus the carb.

]]> Engines: GM/Chevrolet: Short Block Sat, 23 May 2026 00:23:01 GMT 184710007 https://motorheadmedia.com/short-block/184710007/lt-short-blocks-gm-iron-or-aluminum-block-callies-diamond.html Note: Price shown is for the LT4 short block. Click BUY NOW to get over to our website for L8T pricing and more details. GM's LT iron (L8T) and aluminum (LT4) blocks have proven to be strong performers. We have found these blocks able to reliably handle far more power than their LS predecessors. These short blocks benefit from our state-of-the-art CNC machining which provides a level of precision far beyond OE. All blocks are individually serialized on our 4-axis CNC for traceability. We…

]]> Engines: GM/Chevrolet: Short Block Fri, 22 May 2026 07:50:03 GMT 184160518 https://motorheadmedia.com/short-block/184160518/ls-next2-427-cubic-inch-shortblock-for-big-boost.html This is the last stop before going to a billet block. In fact, that's exactly the path that the owner of the car in the video took. He rang up 2,740 horsepower to the wheels with this combination. He then moved up to one of our billet block builds and bigger turbos for even more power. Before getting too much deeper here, you should click the BUY NOW link to get over to our website. We have lots more info posted there as we are not constrained by format. Still reading? Okay. Parts Lists -…

]]> Engines: GM/Chevrolet: Short Block Fri, 22 May 2026 07:50:03 GMT 184145988 https://motorheadmedia.com/short-block/184145988/408-ci-ls-short-block-for-na-street-.html This short block is intended to be used in a naturally aspirated build. Its design is very similar to our 370 cubic inch, boost-ready LS short block. This NA version has a stroker crank for more displacement, flat top pistons for a little bit more compression and a slightly different hone finish on the cylinder walls. Going to a 4.000" stroke with a 4.030" bore diameter brings us to 408 cubic inches. Our standard recipe NA engine builds with this short block typically fall into the 675 - 750…

]]> Engines: GM/Chevrolet: Short Block Fri, 22 May 2026 07:50:03 GMT 183941253 https://motorheadmedia.com/short-block/183941253/brand-new-434-shortblock.html 434 short block assembly...... consist of dart shp block, 4340 4.000 crank, 6.000 h-beam rods w/2000 bolts, mahle forged dome pistons, plasma moly file fit rings, hp bearings, brass freeze plugs, fel pro rear main seal, square decked, bored and finished honed, prepped, balanced and assembled. ready for u to complete.. $6695.00 call andy 336-476-5410

]]> Engines: GM/Chevrolet: Short Block Fri, 22 May 2026 07:50:03 GMT