We Install a 500 Horsepower Engine in Our SUPERCAR!

Product Reviewed / Installed

• Ford 5.0L engine retrofit (500+ horsepower “supercar” build concept) originally from a 1985 Mustang, rebuilt into a custom mid/rear setup for a project car called “Jigsaw.”
• The video emphasizes fabrication and installation more than a single retail “product,” but several key components are highlighted as part of the performance/fitment experience.

Main Features & What Was Done (Key Points)

1. Engine provenance + long project

   • The engine was saved for years after the dad’s passing.
   • It was later used for a 1997 Boxster that had a blown engine.

2. Custom subframe + chassis modifications

   • A subframe was built to:
     • Lengthen the wheelbase by ~4.5 in
     • Lower the rear suspension
     • Create mounting points for the engine
   • Added bracing and a custom aluminum body.

3. Engine mount alignment issues

   • Mounting tubes were welded but did not line up with the holes, preventing bolt installation.
   • The team re-positioned the mounts by cutting tack welds.
   • Tip mentioned: use a tapered alignment tool to center holes and reduce misalignment (especially if prior bolts may have been mismatched to hole size).

4. Intake gasket fitment comparison (same company vs local parts)

   • Initially references intake gaskets made by the same company as the heads, which fit well to the ports.
   • Since they weren’t keeping the manifold long term, they bought different intake gaskets locally.
   • Con: port sizing was slightly different, implying more fitment variance (and possible future rework).

5. Valve cover clearance problem + vendor solution

   • Valve covers wouldn’t clear the rockers, because “everything inside the cylinder head” was larger than original.
   • They contacted Speedmaster, who supplied the correct valve covers, increasing clearance.
   • Result: enough clearance to proceed with assembly (“gaining just a little bit of clearance”).

6. Engine + drivetrain integration (Kennedy Engineered Products)

   • Used Kennedy Engineered Products parts: adapter, flywheel, clutch, and starter.
   • Notes:
     • Flywheel was rebalanced for the new crankshaft + harmonic balancer combination.
     • Transmission fitment was exceptionally smooth: “doesn’t go in any smoother than that.”

7. Exhaust header + primary tube fitment

   • Header primaries are marked for position and require a specific installation order.
   • Some tabs appeared intended for a 351, but were cut because they got too close to spark plugs.

8. Timing/starting + expected behavior

   • Before starting: remove spark plugs, crank to verify oil pressure.
   • The engine starts immediately, but it likely won’t idle well with the current cam/carb.
   • Expected behavior: it makes “a lot of noise”; mufflers will likely be required.

9. Cooling system problem

   • Cooling pipes from the electric water pump run into their new 9-qt oil pan, which “doesn’t work.”
   • They plan to reroute since they have “plenty of room.”

10. Ongoing build priorities

    • The exhaust system still needs building.
    • The cooling system must be fixed before running longer than ~30 seconds.

Pros (As Evidenced in the Video)

• Proper parts sourcing solved critical fitment problems
  • Speedmaster valve covers addressed rocker clearance.
  • Kennedy Engineered Products adapter/flywheel/clutch/starter supported drivetrain integration and balancing.
• Successful reassembly and first start
  • Oil pressure check implied, followed by a successful start with the engine now running.
• Clear install logic for headers
  • Marked primaries + guidance on order helps prevent assembly mistakes (even though tabs still required modification).

Cons / Challenges (As Mentioned)

• Fabrication alignment errors
  • Engine mount holes didn’t line up with welded tubes; required cutting tack welds and re-centering.
• Fitment variance with consumables
  • Locally sourced intake gasket ports differed slightly from the head/manifold-matched option; acceptable as a temporary workaround but not ideal long term.
• Valve cover clearance isn’t plug-and-play
  • Correct ordering and correct valve covers were required.
• Exhaust header hardware needed modification
  • Tabs likely intended for a different engine application (351) were cut due to spark plug proximity.
• Starting setup not finalized
  • Carb/cam combo likely won’t idle well.
• Cooling system conflict
  • Electric water pump cooling pipes interfere with the new oil pan, restricting runtime until fixed.
• Noise
  • Engine is loud immediately; mufflers are needed.

Comparisons Made

• Gasket comparison
  • Gaskets from the same company as the heads fit well.
  • Local store gaskets had slightly different port sizing.
• Exhaust/header app note
  • Header tabs appear intended for a 351 application, requiring customization.
• Vendor support vs DIY expectations
  • Reaching out to Speedmaster for valve covers contrasts with the initial expectation that existing covers would fit.

User Experience / Workflow

• Strong emphasis on hands-on fabrication and trial-and-error:
  • Cutting/re-welding/realignment (engine mounts)
  • Measurement and rework (e.g., gear depth/distributor housing distance)
  • Planning tradeoffs between temporary and long-term solutions (manifold not long-term, so different gasket choice is workable)
• Build momentum impacted by real-world scheduling constraints (busy period at work, new grandpa duties).

Numerical Values / Scores Mentioned

• Wheelbase change: about 4.5 inches longer
• Oil pan capacity: 9 qt
• Runtime constraint before fix: only run “more than 30 seconds” after cooling routing is corrected (implied prior limitation)
• No formal rating score (no stars/grades).

Concise Verdict / Recommendation

• The “product value” is mainly in the specific aftermarket components that resolved critical issues—especially Speedmaster valve covers and Kennedy Engineered Products drivetrain parts.
• Overall, the swap looks successful and promising, but it’s not plug-and-play: expect significant fabrication, alignment, and cooling/exhaust finalization before it’s fully ready for daily usability.

Speakers / Differing Views (End)

• Main builder/host (primary voice): describes fabrication challenges, fitment issues, and parts selection; celebrates successful mounting and first start.
• Friend/other person (brief cameo): mentions a hit-and-run and suggests a dash cam (not related to the engine build).
• Notable quoted person “Ryan” (not present): earlier work referenced (welding tubes) is blamed for misalignment; later indicates parts/support occurred before the current build phase.