The Delta 88 begins this transformation in exactly the condition that makes an ambitious drivetrain swap both ridiculous and strangely reasonable. The 1975 Oldsmobile leaks heavily, smokes, has unreadable gauges, ineffective rear brakes, tired suspension, questionable engine mounts, and a generally neglected underside, yet its modified 350 manages 221 horsepower on the dyno before the old drivetrain comes out. That baseline gives the project a useful benchmark because the replacement is a built, Procharged 6.4-liter Hemi expected by the builders to land somewhere around 600 to 700 horsepower. Putting that combination into an enormous old sedan riding on gold 26-inch wheels is inherently entertaining, but the episode becomes more interesting once the apparently simple swap starts revealing how much engineering separates "the engine fits" from "the car runs."
Removing the original drivetrain exposes enough mechanical decay to justify replacing nearly everything underneath. Oil and transmission fluid appear throughout the underside, the rear suspension has apparently been lowered by heating a spring, brake components are badly worn, old fuel lines are severely corroded, and the differential fluid resembles thick sludge. Rather than merely laughing at the condition, the team investigates the rear axle sufficiently to identify an eight-and-a-half-inch 10-bolt with 28-spline axles and a 2.73 ratio, allowing an appropriate limited-slip differential to be planned. Small discoveries such as using a reversed brake drum to help remove an axle give the teardown an appealing workshop quality, where unfamiliar old-car hardware is approached through measurement, research, experimentation, and occasional disbelief.
Preparing the Hemi provides a similarly satisfying mixture of reuse and repair. Damage from the donor Challenger includes a broken plastic valve cover, a bent supercharger bracket, and a cracked mounting point on the cylinder head, requiring welding, machining, a thread repair, and replacement hardware before the Procharger can be trusted again. An aluminum valve cover previously used on another Hemi project is repurposed, while an initially incorrect rear-sump oil pan produces another useful lesson when the timing-cover differences prevent it from fitting. The eventual correct pan, adaptable engine mounts, Turbo 400, reused flexplate, and other parts demonstrate one of the episode's recurring strengths: maintaining several Hemi-powered projects creates a useful ecosystem of components that can be repurposed instead of purchased again.
Surprisingly, physically installing the drivetrain is among the easiest parts of the project. Despite improvised leveling, wooden spacing blocks, rough measurements, and the expectation that something will inevitably interfere, the engine and transmission settle into the huge Oldsmobile engine bay with relatively little drama. The factory transmission crossmember remains usable with an inexpensive mount, the custom engine mounts require straightforward trimming and welding, and major components clear more easily than anticipated. Oil-filter placement still requires another solution, and the exhaust becomes considerably less cooperative, but watching the drivetrain quickly progress from suspended test fit to securely mounted assembly gives the episode an unusually strong mid-build payoff.
Header fitment provides the messier counterpoint. Long tubes collide with the steering shaft, suspension mounting points, frame, and other hardware, while stock manifolds fail to offer an easy alternative. Repeated hammer clearancing eventually crushes one runner enough to raise legitimate questions about flow, leading to a deliberately crude experiment with a damaged anemometer. The test indicates reduced airflow through some runners, but differences in runner length and pipe diameter prevent the results from isolating denting as the cause, something the builders appropriately recognize. Their eventual plan—to dyno the car with the modified headers, later install a larger set altered through cutting rather than severe denting, and compare power—is much more meaningful than pretending the improvised airflow experiment settled the issue.
The fuel-system conversion is comparatively methodical. The deteriorated factory lines are discarded, the recently replaced fuel tank is retained, the original pickup is adapted, and an external electric pump is positioned as low as practical to improve its ability to draw fuel. New feed and return plumbing, a pressure regulator, existing upgraded injectors, and stock fuel rails create a relatively simple system intended for 93-octane pump gasoline rather than ethanol blends, reflecting the stated goal of making the car convenient to drive. The episode explains why the pump location matters and how the regulator is being used with the factory returnless rails, providing enough reasoning behind the installation that the work feels more substantial than a montage of fittings and hoses.
The electronics are where the planned first startup collapses. An attempt to retain the factory Mopar ECU and engine harness initially appears sensible because the donor drivetrain arrived as a relatively complete package, and an aftermarket body-side harness is intended to let the factory controller operate outside its original chassis. Instead, multiple ECUs, security configurations, programming approaches, transmission settings, expert consultations, and repeated attempts all produce the same fundamental failure: no spark and no successful startup. The team eventually concludes that the donor controller's year, prior unlocking and tuning, security requirements, crate-engine calibration, or some still-unidentified compatibility issue is preventing the combination from working. Importantly, the video ends without pretending the problem has been solved. After days of troubleshooting and even returning late at night for another attempt, the Oldsmobile remains unfinished.
That missing startup denies the episode the obvious payoff, but the failure also becomes its most revealing material. The team openly acknowledges that a dedicated aftermarket ECU or a purpose-built controller could likely have provided an easier path, yet explains that experimenting with stock electronics is valuable precisely because repeated failures teach them how the systems behave. The presentation occasionally wanders through recycled parts histories, sponsor material, improvised experiments, and increasingly complicated ECU explanations, but the visible frustration gives the build credibility. An engine swap that initially looks almost suspiciously easy ultimately stalls on software and electronics rather than fabrication, making the unfinished ending disappointing while also capturing the reality that modern drivetrain swaps can be defeated by components that physically fit perfectly.
Pros
- The 221-horsepower baseline gives the project a concrete starting point before the much more powerful Procharged Hemi replaces the original drivetrain.
- Inspection of the neglected Oldsmobile reveals meaningful mechanical problems in the brakes, differential, fuel system, suspension, mounts, and leaking drivetrain rather than treating the car as a cosmetic shell.
- Repairing crash damage to the Hemi and reusing components from previous builds adds practical fabrication and parts-management depth.
- Engine and transmission fitment progresses unusually smoothly, including retention of the factory transmission crossmember and relatively simple custom engine mounts.
- Header interference leads to genuine experimentation, and the builders acknowledge that their crude airflow test cannot isolate all the variables involved.
- The replacement fuel system is explained clearly, particularly the reasoning behind external pump placement, return plumbing, and pressure regulation.
- Repeated ECU failures remain in the episode, showing the difficult troubleshooting behind a modern-engine swap rather than editing the project into an unrealistically effortless success.
Cons
- The episode ends without the Hemi starting, leaving the central transformation without its expected mechanical or performance payoff.
- Multiple ECU replacements, programming changes, security concerns, transmission configurations, and consultations become increasingly difficult to follow as each proposed solution fails.
- The improvised header airflow experiment is too uncontrolled to establish how much the heavily dented runner alone affects flow.
- Several important systems remain unfinished, including the oil-filter solution, exhaust configuration, differential upgrade, and broader roadworthiness work required by the Oldsmobile's condition.
- The sponsor segment arrives while the build is accelerating toward a first startup and interrupts the momentum.
- The original rear brakes are shown to be nonfunctional and other mechanical problems are identified, emphasizing how far the car remains from safely demonstrating its projected power.
The project makes impressive physical progress, transforming a leaking, tired Delta 88 into a mounted Procharged-Hemi build with a Turbo 400, revised fuel system, repaired supercharger hardware, and enough successful fabrication to make the swap look deceptively straightforward. That illusion disappears once the stock Mopar electronics refuse every attempted solution, leaving the engine silent and the episode without the startup that would have completed its arc. The unresolved ending lowers the immediate satisfaction, but showing the ECU failures in full gives the build valuable authenticity and turns what could have been a simple spectacle on 26-inch wheels into a convincing demonstration that modern swaps can become most difficult after the heavy fabrication is already finished.
