Mercruiser 454 Mpi: Sierra Thunderbolt HEI Tune - Up Kit For V8 Mercruiser Engines

Sierra Thunderbolt HEI Tune - up Kit for V8 Mercruiser Engines

NEW ALTERNATOR MERCRUISER MARINE STERN DRIVE 454 MAG MPI 5.0L EFI 5.0L MPI

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 Mag MPI Horizon Stern Drive V8 Chevrolet Big Block - Finger Sense Anti-Theft Module

NEW SOLENOID RELAY Mercruiser 454 Mag MPI Horizon (Gen VI) GM 7.4L 454ci 8cyl

Smart-Tune-X Adjustable Fuel Tuner Performance Chip Mercruiser 454 MAG MPI

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 Mag MPI Stern Drive V8 Chevrolet Big Block - Finger Sense Anti-Theft Module

Smart-Tune-X Adjustable Fuel Tuner Performance Chip Mercruiser 454 MPI

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 Mag MPI From 0L002200 Inboard 8-cylinder GM Big Block - Finger Sense Anti-Theft Module

STARTER MERCRUISER STERN DRIVE 454 MAG MPI HORIZON 7.4 9000888 50-808011A05

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 MAG MPI - Finger Sense Anti-Theft Module

STARTER MERCRUISER MARINE INBOARD 454 MAG MPI HORIZON 30459

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 MPI - Finger Sense Anti-Theft Module

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 MPI V8 GM Small Block - Finger Sense Anti-Theft Module

SET OF 4 PERFORMANCE SPARK PLUG MERCRUISER 454 MPI? Inboard 8 cyl GM Big Block * XD297LR15ZC456ht

Magnum Remusshield Finger Touch Immobilizer Mercruiser 454 MPI Inboard 8-cylinder GM Big Block - Finger Sense Anti-Theft Module

SET OF 4 PERFORMANCE SPARK PLUG MERCRUISER 454 Mag MPI? Stern Drive 8 cyl Chevrolet Big Block * XD296LR15ZC456ht

SET OF 6 PERFORMANCE SPARK PLUG MERCRUISER 454 Mag MPI Horizon From 0L604250 Stern Drive 8 cyl Chevrolet Big Block * QY295LR15ZC456ht

SET OF 4 PERFORMANCE SPARK PLUG MERCRUISER 454 Mag MPI Horizon From 0L604250 Stern Drive 8 cyl Chevrolet Big Block * XD295LR15ZC456ht

SET OF 8 PERFORMANCE SPARK PLUG MERCRUISER 454 MPI? Inboard 8 cyl GM Big Block * AWK297LR15ZC458ht

SET OF 4 PERFORMANCE SPARK PLUG MERCRUISER 454 MPI? Inboard 8 cyl GM Small Block * XD298LR15ZC456ht

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Mercruiser 454 Mpi Popular Q&A

Q: 1999 Mercruiser 454 MPI 385HP Engine Specs.
A: The 1999 454 MPI delivers 385 horsepower (hp) to the propeller shaft of the stern drive. The 385-hp version of this engine is titled the MerCruiser MAG 454 MPI.... Read More »

Q: I have a 1999 mercruiser 454 mpi engine with and electric fuel.
A: Yes, a Merc shop can run some tests on the unit, after that the ecm would need to go back to merc. This could be an ecm issue, yes. You do not want to try testi... Read More »

Q: What does the timing on a 454 mercruiser need to be set at?
A: I have seen specs as high as 13 degrees but that seems a bit high to me. I would settle for something around eight degrees. That way you will be reasonably safe... Read More »

Q: How to Winterize a MerCruiser 5.0 MPI.
A: 1. Pour the appropriate amount of fuel stabilizer into the fuel tank. Refer to the label on the can for the correct mixture. 2. Remove the boat drain plug at th... Read More »

Q: What is the cylinder compression of a mercruiser 7.4 mpi engine?
A: MY Mercruiser 502 8.2L V8 between 133-155 pounds pressure dry, not warmed up & throttle at idle instead of wide open throttle. I was comparing the difference be... Read More »

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