The block is the foundation of an engine, the main component to which every other part is attached, and it better be right, especially if it’s a high horsepower performance motor, or you can quickly end up with a very expensive boat anchor. You can base your performance engine on a used OE cylinder block, but you have many more options and a much greater chance for a successful build with an aftermarket performance engine block.

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    • (0 reviews)
      # sp15816
      Big M Sportsman Engine Block by Dart®. With multiple deck heights and bore sizes up to 4.600", the Big M Sportsman block gives you the versatility to build a wide variety of engine combinations. A true priority main oiling system oils...
      Standard 9.800" and tall 10.200" deck heights available for stroker enginesStandard 4.250" , 4.500" or 4.600" bore sizes with siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300" thick with 4.625" bore)
      $2,383.97 - $2,973.84
    • (0 reviews)
      # sp105015
      Big M Engine Block by Dart®. With multiple deck heights and bore sizes up to 4.600", the Big M block gives you the versatility to build a wide variety of engine combinations. A true priority main oiling system oils the main bearings...
      Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability
      $2,383.97 - $6,700.62
    • (0 reviews)
      # sp15815
      Big M Full Water Engine Block by Dart®. With deck heights of up to 9.800" and 10.200" and bore sizes of up to 4.310", the Big M Full Water Block gives you the versatility to build a wide variety of engine combinations. A true priority...
      Standard 9.800" and tall 10.200" deck heights availableStandard 4.250" or 4.310" bore sizes
      $2,383.97 - $2,973.84
    • (0 reviews)
      # sp15821
      Engine Block by Dart®. Dart has developed a new world of performance for metric 8.1 big block engines. The Gen 7 block has full water jackets between the cylinder bores and has been improved with strengthened design and priority main...
      Premium iron alloyPriority main oiling for improved reliability
      $2,383.97 - $2,832.40
    • (0 reviews)
      # sp105019
      Iron Eagle Engine Block by Dart®, This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for...
      Big block camshaft bearings allow use of cams with larger base circle diameter to improve strength and recue twisting with cam driven pumpsDual starter mounts allow starter to be mounted on either side of block for chassis and oil pan clearance
      $3,102.62 - $3,473.08
    • (0 reviews)
      # sp105021
      Iron Eagle Sportsman Engine Block by Dart®. Dart Iron Eagle Sportsman blocks for small block Ford engines are powerful, competition blocks that offer racers the features they need while remaining affordable. This premium product is the...
      Siamesed cylinders: Standard 4.000" or 4.125" cylinders can be safely bored to 4.185" diameterMultiple deck heights allow for increased displacements of up to 468 cubic inches
      $2,606.20
    • (0 reviews)
      # sp105025
      LS Next Engine Block by Dart®. Designed utilizing the latest technology, this product by Dart features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Dart’s LS Next block is cast in the USA with premium cast iron alloyConventional style 4-bolt steel main caps with 7/16” bolts are used
      $2,716.30 - $5,206.70
    • (0 reviews)
      # sp105023
      Little M Engine Block by Dart®. The Little M is cast from premium high strength iron and beefed up in all the critical areas. A competition oiling system ensures adequate lubrication to the main bearings at high rpm. You can select...
      Extra thick cylinder walls resist cracking and improve ring seal for more powerScalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures
      $2,985.66
    • (0 reviews)
      # sp105024
      Little M Sportsman Engine Block by Dart® This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...
      Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability
      $2,474.69
    • (0 reviews)
      # sp15830
      M Pro Engine Block by Dart®. Cast from premium high strength iron and reinforced in all critical areas, the Little M Pro block offers several cam upgrades and a lightening option to take the standard Little M design to the next level...
      Extra thick cylinder walls resist cracking and improve ring seal for more power (minimum .275" thick with 4.185" bore)True priority main oil system lubricates the main bearings before the lifters
      $4,099.07
    • (0 reviews)
      # sp15835
      Race Series Aluminum Engine Block by Dart®. The camshaft is raised .400" above the stock location to increase clearance for the connecting rods and crankshaft counter weights, and the main oil gallery is located alongside the camshaft...
      Premium alloy: Dart aluminum blocks are cast from virgin 355-T61 aerospace alloy for superior strength and integrityDuctile iron sleeves with extra thick cylinder walls promote excellent ring seal
      $6,700.62
    • (0 reviews)
      # sp105026
      Race Series Tall Deck Iron Engine Block by Dart®. The camshaft is raised 0.600" above the stock location and the main oil gallery is located alongside the camshaft tunnel to eliminate interference with the crank assembly. The oil pan...
      Four valley head stud bosses prevent head gasket failures with high compression ratios and/or nitrous oxide. Slotted bosses allow the use of studs instead of difficult to install boltsTrue priority main oil system lubricates the main bearings before the lifters. Our stepped main oil gallery (9/16" to 1/2" to 7/16") increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft
      $3,695.71
    • (0 reviews)
      # sp15838
      SHP Engine Block by Dart®. Designed for high performance and heavy duty applications, the SHP block is the ideal starting point for hot rodders, drag racers, circle track competitors, off-roaders and high performance marine enthusiasts....
      350 or 400 main journals accept commonly available crankshaftsSplayed outer bolts on middle main bearing caps prevent cracks
      $1,718.26 - $2,099.54
    • (0 reviews)
      # sp125060
      Special High Performance Engine Block by Dart®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $1,802.07 - $2,099.54
    • (0 reviews)
      # sp32168
      Powerstorm Pro Series Short Block by Livernois Motorsports®. The Powerstorm Pro Series product line is built for customers who are looking for products that offer a no compromise approach. The components and services used in these...
      High quality at an affordable priceExpertly made from premium materials
      $6,587.99 - $9,271.99
    • (0 reviews)
      # sp32169
      Powerstorm Race Series Shortblock by Livernois Motorsports®. The Livernois Race Series product line is built around proprietary race components and expert craftsmanship, designed to win races and survive whatever you can throw at them....
      High quality at an affordable priceExpertly made from premium materials
      $8,417.99 - $18,299.99
    • (0 reviews)
      # sp32171
      Powerstorm Street Series Shortblock by Livernois Motorsports®. Designed utilizing the latest technology, this product by Livernois Motorsports features premium quality and will perform better than advertised. Perfect for your vehicle...
      High quality at an affordable priceExpertly made from premium materials
      $5,367.99 - $6,587.99
    • (0 reviews)
      # sp94602
      Engine Block by Chevrolet Performance®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...
      High quality at an affordable priceExpertly made from premium materials
      $1,857.78 - $3,482.26
    • (0 reviews)
      # sp31987
      Engine Kit by OS Giken®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...
      High quality at an affordable priceExpertly made from premium materials
      $20,000.00 - $22,000.00
    • (0 reviews)
      # sp134330
      Bare Engine Block by Speedmaster®. 1 Piece. Build your dream engine. The next level of performance is these aluminum Chevy small blocks. Block is ready for the street racer or all out racer with added strength and cubic inches. All the...
      Created by professionals to meet your requirementsSuperior longevity and dependability
      $1,957.00 - $3,502.00
    • (0 reviews)
      # sp103969
      Valley Cover by Edelbrock®. Designed utilizing the latest technology, this product by Edelbrock features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $41.95 - $44.95
    • (0 reviews)
      # sp98412
      Main Cap Girdles by Trick Flow Specialties®. Comes in a kit. Includes Hardware. Trick Flow® main stud girdles will strengthen Ford's factory 2-bolt main cap assemblies. Crafted from tool steel and finished with black oxide, these...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $247.85
    • (0 reviews)
      # sp135604
      Darton MID™ Block Sleeves by Brian Crower®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      Cast iron performance in an aluminum blockImproved block integral strength
      $470.12 - $2,312.19
    • (0 reviews)
      # sp92559
      Main Cap Kit by Milodon®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...
      Painstakingly designed to meet your racing needsState-of-the-art manufacturing technology
      $84.95 - $404.95
    • (0 reviews)
      # mpn358728974
      Valley Cover Plate by Chevrolet Performance®. Valley Cover Plate by Chevrolet Performance®. This COVER is a genuine OEM GM part #12599296 and carries a factory warranty. Designed utilizing the latest technology, this product by RHS...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $139.53
    • (0 reviews)
      # mpn358729041
      Valley Plate Assembly by Chevrolet Performance®. Universal aluminum valley plate is designed for use with 18° cylinder heads. Can be used with dedicated 2-piece manifold spiders, existing 1-piece intake manifolds which have been...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $398.60
    • (0 reviews)
      # sp10881
      Main Cap Girdle by Canton Racing®. Get the most out of your racing experience with Canton Racing. Manufactured using only premium materials and advanced technologies, this product will provide you with the quality and power you need. It...
      Made from high-grade materialsProvides efficient performance
      $227.00 - $333.00
    • (0 reviews)
      # sp21562
      MID Cylinder Sleeve by Darton Sleeves®. Pack of 4. This experience, our racing heritage, and our highly experienced staff of machinists and racing engine builders offered a unique set of blended talent to solve inherent block weakness...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $604.65 - $667.99
    • (0 reviews)
      # sp21563
      Replacement Cylinder Sleeve by Darton Sleeves®. The ASTM specifications for performance ductile iron sleeves indicates a minimum tensile strength of 100,000 pounds. Darton Sleeves are much stronger than this and will withstand the...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $105.01 - $132.86
    • (0 reviews)
      # sp134064
      Extreme Billet Main Caps by Howards Cams®. Precision CNC machined from superior quality low carbon 1020 billet material. Available as stock replacement (straight bolt) or with splayed outer bolt holes. The splayed caps feature 10...
      Low carbon 1020 billet steelNone stronger
      $60.14 - $270.39




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    Some engine builders prefer a “seasoned” original engine block, but dimensional accuracy is critical in a performance block, and an old block’s accumulated wear may prevent you from attaining this degree of precision. Even if you can, the cost of checking for cracks and the various machining operations to make the block right could end up costing you more than a new block. But there are many other reasons a new performance engine block is a better choice.

    Aftermarket engine block makers analyze the factory product and they know the weaknesses and where improvements can be made. Plus they’re not under cost and weight restrictions like the OE designers. As a result, you can get blocks made with more material to prevent bore distortion and maintain head gasket seal, and billet steel splayed 4-bolt main caps for greater strength. The factory cooling and/or oiling systems are less than ideal for performance on some engines. Blocks are available with larger water jackets for improved coolant circulation and re-engineered oil galleries and oil feed holes to increase oil flow.

    Perhaps the best motive for using an aftermarket block is that your engine can be made so much larger. When it comes to making horsepower, there’s no substitute for cubic inches, but the meat in a factory block can limit the size of an overbore, and there may not be enough room inside the crankcase for a substantial increase in stroke. In contrast, aftermarket blocks have more material for increased bore size, and some even have larger bore spacing. Blocks are available with the cam located higher up in the block to clear a stroker crank. You can build an engine with far greater displacement that’s still the same physical size.

    Performance engine blocks come in cast iron and in aluminum with iron sleeves. Aluminum blocks are lighter, but generally more expensive. Blocks can be purchased unfinished, partially finished, and fully machined, ready for assembly. In addition to different bore spacing and raised camshaft location, aftermarket blocks are also available in a range of deck heights, a choice of main bearing bore sizes, starter mounts on both sides of the block, and set up for wet or dry sump oiling systems. In addition to blocks, we also offer freeze plugs, dowel pins and other block related engine assembly parts.

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    Engine Blocks Reviews

    Average rating:  5  5 - 1 review
    5 of 5
    Cylinder Sleeves By Melling
    The delivery was fast. Always pleasant to order from these guys. Tracking number was sent to me next day.
    GPosted by Gerard (Ben Wheeler, TX) / September 18, 2016
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