• 12-gauge steel construction is strong, durable, and lasts unlike foam/plastic versions
• Accepts all BBC bolt-on parts (exhaust, intake, oil pan, etc.) to confirm engine fit
• SoloSwap™ available in short block and long block mock up engine configuration
• Short block SoloSwap™ version weighs 23 pounds and accepts stock or aftermarket SBC cylinder heads
• Long block SoloSwap™ version weighs 39 pounds and includes steel fabricated mock up heads
• Easily lifted and set into place by hand without engine hoists or additional help
• Patent pending mock up block can be used to mock up any BBC engine, including 396, 454, 502, and more
• Works with two piece rear main seal (Mk IV) and one piece rear main seal (Gen V and VI)
• Short block deck heights are adjustable for 9.800” and 10.200” deck heights
• Ships and can be stored flat with simple assembly/disassembly steps
• All hardware included for assembly of short or long block versions
• Customer supplied head bolts and accessory bolts required to add parts to mock up
• Winner of SEMA Best New Product - Tools And Equipment - award for 2024

Mock Up Your BBC Build Quicky and Easily Without the Need for An Actual Engine

General Motors’ Mark IV big block, affectionately known as the “rat motor” to many, was the high horsepower big brother to the small block Chevy. Built in tire shredding displacements throughout the muscle car era, they are not only known for their power output, but for their engine compartment filling stature. Stuffing a big block Chevy into your early hot rod certainly ups the wow factor when you’re pulling into the local cars & coffee. The later Generation V, VI, and VII offerings found in trucks, commercial applications, and the GM parts catalog are no slouch either, offering 4-bolt mains and an upgraded one-piece rear main seal design.

Traditionally, building something with an engine that was never meant to be installed in it would require an engine hoist, an actual engine, and a spotter or two keeping things in check while measurements were taken, parts tack welded, and so forth. It’s not an easy or quick process, and it can be dangerous with a 600 plus pound Chevy big block engine dangling on a chain over your hands (or head!). While this may have been how your father did engine swaps in the past, there is a better, and safer way to mock up a big block Chevy engine in your project, and that is with the Speedway Motors SoloSwap™ steel BBC mock up engine block.

Laser Cut Steel Plate for Strength, Simplicity, and Easy Storage

Even if you have your big block Chevy engine all apart down to the bare block, that bare casting is still several hundred pounds to try and roughly move into place to figure out your engine mounts, headers, and more on your project. Using replica engines to mock up your BBC swap for your project is much safer and your back will thank you for your efforts.

Past mock up options included a plastic engine block or foam engine block, which, while being light and easy to maneuver, these plastic engines often did not hold up well to repeated usage or the installation of heavy components like long tube headers or a turbo manifold with turbo bolted to it. They’re also not the best option when localized welding and grinding is happening to fab engine mounts/brackets either. Plastic blocks can easily be damaged from grinding or welding sparks. This is why we designed our SoloSwap™ BBC mock up block system from laser cut 12-gauge steel with all accessory mounting holes accessible from the back side for simple “nut and bolt” assembly of your accessories for engine mock up. No more thread inserts that work their way out of the foam engine block material or even needing the factory hardware during the mock up phase. Just grab yourself any fastener of the proper length and diameter, saving the good installation hardware for final assembly.

Available in Short Block or Long Block Configurations

Furthermore, our SoloSwap™ BBC engine mock up block, which is available in short block and long block options, ships unassembled, saving you shipping costs and storage room when not in use. Simply assemble the mock up pieces following the provided instructions with the fasteners included and your mock up engine block is ready to use in minutes. Our steel mock up block can also be easily disassembled for storage, unlike some steel mock up blocks that utilize folding tabs. Once those tabs are bent over the block stays assembled. Store your disassembled mock up block wherever it will easily fit, such as under a workbench, on a shelf, or other location that a full size plastic engine block or real engine block wouldn’t fit or have the weight capacity to handle (ever try storing a real engine block on a plastic shelf?).

Our patent pending SoloSwap™ steel big block Chevy mock up block weighs in at just 23 pounds for the short block and 39 pounds for the long block, making it easy to handle and position all by yourself safely in the engine bay of your project. If you opt for the long block version the included 12-gauge steel cylinder heads provide mounting locations for your intake manifold, exhaust manifolds or headers, and even your valve covers so you can quickly confirm if you’ll have any fitment issues in your engine compartment.

This allows the complete mockup of an assembled and dressed engine, right down to your choice of valve covers, heads, and more to confirm fitment, clearances, plumbing, wire routing, and so much more easily. Even if you’re just using the short block, you can confirm fitment and engine location by mounting the oil pan, timing cover, water pump, and accessory brackets to our mock up block easily. The SoloSwap™ short block also accepts all stock and aftermarket as well, so feel free to bolt up your actual cylinder heads for your mock up duties if you like! Use the best suited for your project and get to work mocking up your engine.

Replicates Popular Big Block Chevy Engines for Perfect Mock Up Test Fitting

We did all the homework for you when designing our new steel SoloSwap™ BBC mock up engine block assembly. We have provided all mounting holes to replicate the engine block and heads of a Mk IV big block Chevy engine or the newer Gen V and VI engines. We have incorporated adjustability into our steel mock up block assembly to provide adjustable deck height of the short block to allow replicating stock and aftermarket deck heights (9.800” and 10.200”), one or two piece rear main seal oil pans, and much more to provide the most adaptable BBC mock up block on the market.

Now you can quickly and easily confirm you have enough clearance for radiator cooling fans, power steering rack, fluid reservoirs, and other items commonly found at the front of the engine compartment. So, whether you plan for a sole big block Chevy swap in your home garage, or your hot rod shop is looking for an easier way to make BBC swaps happen in your customer’s cars, our SoloSwap™ bolt together steel BBC mock up engine block will help you get the job done safely and quickly.

• Cylinder head bolts are not supplied, when mounting real cylinder heads you must use your stock or aftermarket bolts to mount
• Any accessory mounting (fuel pump, water pump, headers, etc.) must be done with the fasteners included with the accessory or aftermarket replacement hardware
• To resist flash rusting we recommend coating the steel sections in a light coat of WD-40 or other product, or they can be clear powder coated or clear painted