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Scott06 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

Thanks for sharing your experience on this thread - 100% Agreed on the prop pitch. Most folks think taxing the engine less by going...

Aug 12, 2026
Scott06 replied to the thread Stuck oil filter.

I bought similar ones like that and a beefy ($$) strap wrench was well worth the money as I maintain 5 cars plus the boat and 3 tractors.

Aug 12, 2026
Scott06 reacted to alldodge's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

Sir, this kind of posting will not be tolerated.

Aug 8, 2026
Scott06 reacted to Fun Times's post in the thread 2005 Mercruiser 5.0L MPI (Bravo 3) - Question about changing Mainfolds/Elbows with Like.

Sometimes the threads may get paint in them adding to the challenge of installing the fittings and may need a cleaning to get things...

Aug 7, 2026
Scott06 reacted to alldodge's post in the thread 2005 Mercruiser 5.0L MPI (Bravo 3) - Question about changing Mainfolds/Elbows with Like.

Most likely the threads need to be chased with a tap. The tap would be NPT type. Sierra parts are a roll of the dice. Barr makes...

Aug 6, 2026
Scott06 replied to the thread 2005 Mercruiser 5.0L MPI (Bravo 3) - Question about changing Mainfolds/Elbows.

it would seem that sierra has chitty machining of the threads - they should be NPT pipe threads get a tap kit for NPT and chase them. If...

Aug 6, 2026
Scott06 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

I wouldn't be pulling the intake at this point nothing points to that if there is no vacuum leak at the gaskets. you have low vacuum...

Aug 5, 2026
Scott06 replied to the thread 1988 Quadrajet and gasket issues.

for vortec this intake has the same dual pattern carb as my cast iron...

Aug 5, 2026
Scott06 replied to the thread 1988 Quadrajet and gasket issues.

MM uses a cast iron manifold with that fits bore sq and spreadbore carbs with no adpater. The eddy 1409 bolts up with a std gasket. I...

Aug 5, 2026
Scott06 replied to the thread 1997 5.7L thunderbolt ignition. Slow crank.

When I bought a repower partial engine from them in 2016 they had a hard on for the TB system and were pushing me towards a Delco est. I...

Aug 5, 2026
Scott06 reacted to muc's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

The 12 inHg number you are worried about is from before the engine warm up state has completed. Unless you are troubleshooting a cold...

Aug 3, 2026
Scott06 reacted to muc's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

I looked at it but there is only about 6 minutes of data after engine reached completed warm up state and during that time and you were...

Aug 3, 2026
Scott06 replied to the thread 1992 OMC 3.0 Cracked Block.

Hard to say with out the parts in front of you. Def more work to change it over- if you already have the carb redone just swap the long...

Aug 3, 2026
Scott06 replied to the thread 1997 5.7L thunderbolt ignition. Slow crank.

it depends on what block they used for a core. the block with out the fuel pump provision have the boss cast just not drilled so they...

Aug 3, 2026
Scott06 replied to the thread 1988 Quadrajet and gasket issues.

thicker gasket is often used to insulate the carb from heat soak and associated issues. Typically on intakes and spacers and open hole...

Aug 3, 2026

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