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    Minor shudders at idle

    Hi, I've got a 3.0L with points ignition. I've got my engine idling at around 600 RPM in the video below. It has a few shudders and rattles a little and I'm not sure if this is normal or what I can do.. I'd really like the engine to idle still and without the rattles. At higher RPM it smooths...
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    Multimeter tach reads RPMs too high

    I purchased an Actron CP7677 automotive multimeter. Hooked up red lead to negative side of coil, black to ground. Set the dial to 4 cylinder. With the engine idling it says my RPMs are ~2500. I know my engine is idling faster then it should but I also know it's no where near that fast. The...
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    Check my work please - setting idle screw back to preliminary setting on a 3.0

    Here's a video I made.. 50 seconds long. Have a watch and let me know if I have this right. Thanks! https://photos.app.goo.gl/LM8sayeomjQWGu8B8
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    Question on tune-up of points ignition & wire/spark plug order

    I read through How To: Tune-up Your Points Ingition and the author is very insistent about making sure you do the wires one by one. I am unclear as to why. If I know my engine's firing order, and I know where the rotor is pointing, and cylinder 1 is just before top dead center, I can make sure...
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    Correct RPM for setting timing on muffs

    I'm going to set the timing on my 3.0L using water muffs. It's supposed to be at 8 deg. BTDC but not sure what RPM that's supposed to be at. Manual says idle is 650-700 RPM in forward gear but idle will be higher on muffs, so does that mean I should set timing slightly earlier than 8?
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    Replaced temperature sender and water ran out

    I'm assuming this is entirely normal but I'm really not sure. Boat hasn't run in a couple of weeks. Took the old temperature sender off of the 3.0L engine and water ran out of the hole for a bit. Is that expected?
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    Cleaning gas tank?

    I have a '91 Larson All American and I'm trying to determine what the fuel tank is made of - is it possible for it to have rust inside of it, and also how to tell if it needs to be cleaned out, and if so how to actually clean it. I can connect a hose to the gas line and siphon out the gas...
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    Upgrade from prestolite to pertronix or replace dist. with delco voyager

    Possibly a dumb question - I have a prestolite points distributor on my 3.0L. I can upgrade it to use pertronix ignitor and replace the coil with a flame thrower, or I can spend about $70 more and replace the entire distributor with a delco voyager unit...
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    Recommend aftermarket carb for Merc 3.0L

    I'm looking at either the Sierra 18-7370N, or one from National Carbuertors out of Jacksonville, FL. Wondering if anyone has experience with either, or what you all would recommend.
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    Spark plug gap difference

    The spark plugs I'm using for my 3.0L have a 0.031" gap. The engine specs call for 0.035" gap. Is that tiny difference going to matter?
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    Recommend a dwell meter

    Wondering what dwell meter you recommend. Reading reviews it seems as though some of the digital ones aren't always consistent.
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    Setting base timing on Prestolite distributor

    Good morning, I want to check/set the timing on my Mercruiser 3.0L. It has the conventional ignition (as opposed to EST). The distributor is Prestolite IBM 7026. The videos I have found on YouTube all show EST distributors and they have a shunt at the base of the distributor where you jump...
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