Refitting a 7.4L 454 V8 inboard is rarely a one-box decision. You might be chasing a fuel smell, a cooling leak, or an engine that finally asked for too much. The first instinct is to price a complete replacement, but sometimes the fix is a single component. These four listings cover both paths: a pair of Crusaider 7.4 XLi components at the lower end, and a pair of MerCruiser 7.4 L 454 V8 complete engines at the top. All four are used, all list Mercury as the brand, and all were removed from fresh-water-only boats. The real question is which level of purchase matches the work your boat actually needs.
Quick take
If the fuel delivery system is the weak point, the Crusaider fuel lines tubes are a direct component-level choice. If exhaust riser corrosion is your concern, the exhaust riser manifold is the other targeted part. If you need a complete powerplant, both MerCruiser engines carry the same top price and differ in rotation: LH or RH.
Listed Price Comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| Crusaider 7.4 XLi 454 GM V8 Inboard Marine Engine gas fuel lines tubes | USD 162.75 | |
| Crusaider 7.4 XLi 454 GM V8 Inboard Marine Engine exhaust riser manifold | USD 246.45 | |
| MerCruiser 7.4 L 454 V8 LH inboard Marine Engine NO SALT Drop In Ready 442 Hrs | USD 6,899.00 | |
| MerCruiser 7.4 L 454 V8 RH inboard Marine Engine NO SALT Drop In Ready 442 Hrs | USD 6,899.00 |
Decision Matrix
| What you need | Consider | Why it fits |
|---|---|---|
| Replacement fuel lines or tubes | Crusaider fuel lines tubes | Used component from a fresh-water boat at the lowest listed price |
| Replacement exhaust riser | Crusaider exhaust riser manifold | Exhaust-specific part with part number 98126 |
| Complete engine, LH rotation | MerCruiser 7.4 L 454 V8 LH | Drop-in ready, 442 hours, left-hand rotation |
| Complete engine, RH rotation | MerCruiser 7.4 L 454 V8 RH | Drop-in ready, 442 hours, right-hand rotation |
Product Notes
Crusaider 7.4 XLi 454 GM V8 Inboard Marine Engine gas fuel lines tubes
This listing gives you exactly the part named: the gas fuel lines and tubes from a 7.4 XLi. The description describes good used condition and removal from a fresh-water-only boat, which is useful for a marine environment. If your refit has already diagnosed the fuel lines, this direct part saves you from buying an entire engine. The limitation is scope: it is only the lines and tubes, not a fuel rail or full system. The mounting hardware is limited to what appears in the photos, so check the images carefully.
Crusaider 7.4 XLi 454 GM V8 Inboard Marine Engine exhaust riser manifold
This exhaust riser manifold is the more targeted component if the riser is your specific failure point. It includes Manufacturer Part Number 98126, which helps you match it to a 7.4 XLi application. The listing also notes good used condition and fresh-water-only origin. The limitation is that you receive one manifold, not a complete exhaust assembly. Additional gaskets, bolts, or mating parts are not listed, so be prepared to source those separately. If the existing riser needs to be swapped, this part may be the exact replacement you need.
MerCruiser 7.4 L 454 V8 LH inboard Marine Engine NO SALT Drop In Ready 442 Hrs
This complete engine is the direct path if your boat needs left-hand rotation. The title lists drop-in ready and 442 hours, while the NO SALT wording and fresh-water removal history point to a low-corrosion background. Choosing this means you are replacing the whole powerplant rather than repairing a component. The fixed LH rotation is the key spec to confirm against your boat's drive system before purchase. The description mentions a running video, which you can review to see it in operation. As with the component listings, the mounting hardware visible in the photos is the hardware that is included.
MerCruiser 7.4 L 454 V8 RH inboard Marine Engine NO SALT Drop In Ready 442 Hrs
The right-hand rotation version of this complete engine is the match for boats that need RH output. Like the LH unit, it is described as drop-in ready with 442 hours and NO SALT, and it was removed from fresh water. This listing puts you in the same full-replacement category rather than a piece-by-piece repair. Because the rotation is specifically RH, confirm that your drive train is set up for right-hand rotation. The description includes a video of the engine running and notes that mounting hardware shown in photos is all that ships.
Final Recommendation
If your repair list is limited to the fuel delivery path, start with the Crusaider fuel lines tubes. If the riser has failed, buy the Crusaider exhaust riser manifold. If the whole engine needs to come out, choose the MerCruiser LH or RH based on your drive rotation. The two complete engines are identical in listed price and condition, so rotation direction is the deciding factor.
