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  1. Q

    What Inline Fuse For 5.7 Mercruiser Starter?

    Hi everyone, I'm having to re-wire my 5.7 Mercruiser and in the service manual wiring schematic, it says there is an inline fuse that connects the red (hot) wire directly from a terminal on the starter solenoid to the battery terminal. I'm running 8ga for this wire. Does anyone know what fuse...
  2. Q

    Wiring Question - Inline Relay For Electric Fuel Pump

    Wiring Question - Electric Choke Hi everyone, I'm wiring in an electric fuel pump for my 5.7, and the wiring schematic says that I need to tap into a purple/yellow wire and send it to the electric choke. My question is - which terminal on the choke? I'm using an Edelbrock 600 cfm marine...
  3. Q

    Oil Pressure Switch

    Hi everyone, I recently bought a new oil pressure switch, which I'm using as part of a switch from a mechanical fuel pump to an electric fuel pump. Please see the pic for reference. The gold-colored switch that is on the left is the new one and the black-colored one of the right is the old...
  4. Q

    Intake Manifold Question

    Hi everyone, Can anyone advise what this inlet is for on my Edelbrock intake manifold? (please see pic for reference). Thanks!
  5. Q

    Wire Gauge?

    Hi everyone, I need to run some extensions from my wiring loom and are hoping that someone can help me to determine what gauge wire I'll need - please see the pic attached for reference. Red = ? Yellow/Red = ? Orange = ? Any help is appreciated in advance.
  6. Q

    Nut Sizes....

    Hi everyone, As part of a re-wiring effort, I need a bunch of nuts to keep the wire ends on their respective terminals. Does anyone know what sizes are the most common for the alternator, coil, starter motor etc? As I'd like to just get a bunch of them and be done with it. Thanks!
  7. Q

    Part Number For 10 Pin Connector Housing?

    Hi everyone, While trying to clean up the 10-pin connector, I sheared off three of the four, small bolts that hold the 10 pin connector into it's housing (please see pic attached). After putting some Kroil on them for a while, they will just not budge (they were mostly rusted) and I'm...
  8. Q

    Dipstick Tube Went In Way Too Easy

    Hi everyone, I recently re-purposed the marine dipstick and tube from a 5.0 Mercruiser, for use in my marinized 5.7 Chevrolet engine (the replacement engine had the standard, car-type dipstick tube that did not bend around the exhaust manifold/head risers). However, the tube that goes into the...
  9. Q

    Slave Solenoid Questions

    Hi everyone, I'm working on wiring in an electric fuel pump on a boat that did not have one previously. The replacement engine is a 5.7 Mercruiser. While that is it's own job - as part of that task, I'm having an issue on where to mount the bracket that houses the slave solenoid / 50 amp...
  10. Q

    Wiring In Electric Fuel Pump

    Hi everyone, I'm trying to incorporate an electric fuel pump into a 5.7 Mercruiser. The prior engine (5.0) had a mechanical fuel pump but the replacement engine does not have all of the holes for the mechanical fuel pump built into the block. Some notes: 1) The replacement engine is on an...
  11. Q

    Stupid Question But I'm Going To Ask it Anyway...

    Hi everyone, Can I remove a couple of intake manifold bolts to install some lift-point brackets and a bracket for some relays/wiring, without needing to use new gaskets and china wall? The engine has NOT been started since I replaced them all. Thanks!
  12. Q

    Inverted Flare Tube Nuts

    Hi everyone, I have a Carter P4389 electric fuel pump that I am trying to incorporate into my 5.7. As part of the installation, I am running double-flared fuel lines from the filter to the pump and then the pump to the carburetor. The in/out connections on the pump take 1/4" NPT nuts. The...
  13. Q

    Need To Change Dipstick Tube...

    Hi, I need to install a different dipstick tube on my 5.7 GM engine. It was a truck engine that was converted for marine use. To get the tube to line up into the port in the block, I need to remove my new exhaust manifold on that side of the engine. Will I need to order a new gasket for the...
  14. Q

    What Wiring Gauge For Alternator / Starter?

    Hi everyone, I'm replacing some of the wiring on my engine build (5.7 GM truck engine that has been converted for marine use) and need some help with the wiring from the starter to the alternator. What gauge wiring should I use? What type of connectors should I use? I'm working through an...
  15. Q

    Oil Filter Housing Question

    Hi everyone, The 5.7L / 350 Chevrolet engine that I have uses an external oil cooler. Unfortunately, I do not know the manufacturer of the oil cooler. I would like to either remove the hoses (that were running to the radiator) and plug the holes or to remove the entire housing and then just...
  16. Q

    Stainless Steel Fuel Hose

    Hi everyone, After taking a brief break from building my engine, I'm back at it and need to make some new stainless steel fuel lines for my 5.7 Mercruiser. The engine is a truck engine that I am in the process of converting into a boat engine and part of that change was needing an electric fuel...
  17. Q

    Cooling Hose Question

    Hi everyone, I need some help with the cooling hoses for my 5.7 truck engine that I have converted for marine use.... I've looked in the factory service manual, but cannot find the part numbers that I'll need (some of the belts from my old 5.0 Mercruiser were badly perished and the part...
  18. Q

    Belt Question For Mercruiser 5.7

    Hi everyone, I need some help with the belt selection for a 5.7 truck engine that I have converted for marine use. It has a power steering pump, water pump and alternator. I pulled all the brackets of my old 5.0 Mercruiser and that engine did NOT have a serpentine belt. I'm still building the...
  19. Q

    Where Can An Find Exhaust Manifold & Heat Riser Bolt Kit To Suit Mercruiser 5.7?

    Hi everyone, I'm having issues finding some replacement bolts for my new manifolds and heat risers. Does anyone have any places that they'd recommend me purchasing from?
  20. Q

    Bolt Size & Nut Size For Alternator On Mercruiser 5.7?

    Hi everyone, Can anyone please advise what size bolt (and nut) I need to attach the bottom section of an alternator to the lower, adjustable bracket? My old alternator was completely rusted out (bolts and all) and so I bought a new replacement, but it did not come with any mounting bolts. I...
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