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Engine Technical Discussion This is our non outboard engine related technical discussion forum. If your boat is powered by a Inboard/Outboard, Jet drive, V-drive, or even something else, then this is the forum for you! Topics include engine repair and maintenance, modifications, drives and gearcases, electrical and electronics, etc. For technical assistance related to outboards, please use our outboard tech forum.

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Old 06-01-2020, 10:44 PM   #11
todd goble
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1995 crate 350 block put all of the 1990 350 mag marine stuff on it. the boat is a 1990 Vision 220
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Old 06-01-2020, 11:19 PM   #12
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Small or big block-18436572. #1 on cap should be at 5 o'clock when looking at cap from front of engine. firing order will continue clockwise from there. 1357 cylinders on port (left) side of engine from front to back, 2468 on starboard (right) side. Like Beamer said, line up timing marks at crank pulley. Pop distributor cap. If rotor is pointing to #1 smile and take sip of available adult beverage. If rotor is pointing at #6, rotate crank another turn and line up marks again, verify order and you are done with that part. Is there a Quadrajet by chance, in the center of the intake manifold?
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Old 06-02-2020, 07:42 AM   #13
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You mean Quadrajunk, with progressive bog..... sorry.
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Old 06-02-2020, 10:13 AM   #14
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You guys awesome, No Holley carb everything on it is built up to the land and sea extension on the lower unit. I will check this out today thank you again
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Old 06-02-2020, 10:29 AM   #15
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You guys awesome, No Holley carb everything on it is built up to the land and sea extension on the lower unit. I will check this out today thank you again

where can we find photos of this project?
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Old 06-02-2020, 03:13 PM   #16
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I just took some pictures and I'm going to try and put them on here tonight, I'm a little challenged in this department. OK a lot
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Old 06-02-2020, 04:40 PM   #17
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Quote:
Originally Posted by todd goble View Post
I did question myself on that, I have 2 wires crossed on each side of the cap, and I'm wondering if I put them back right. I'm trying to figure this out, how do I know my order, and I'm taking my pickup tube out this morning to see how that looks thanks a lot for the info
If you look at the front of the engine #1 spark plug (for a small block chevy) is the first plug on your right. The right bank is numbered 1,3,5,7 and the left bank is numbered 2,4,6,8. Follow the wire connected to #1 spark plug to the cap and mark it. The firing order for a small block chevy is 1,8,4,3,6,5,7,2 and it should be in your manual. Then go in a clockwise direction from #1 wire, the next post clockwise from #1 wire should go to #8 cylinder. The next post clockwise from #8 cylinder should go to #4 cylinder and so on.
None if this will work if #1 is in the wrong place.
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Old 06-02-2020, 08:11 PM   #18
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Just a thought here, a low fuel level in the secondaries on a Holley could cause some grief. I'm going to guess HEI ignition. Mechanical fuel pump? Vacuum secondaries? Another thought is that hooking up a vacuum advance to straight manifold vacuum will cause timing to retard as engine comes under load. Some Holleys have the vacuum advance port and straight manifold vacuum port close together. Q-jets can be tuned, believe it or not.
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Old 06-02-2020, 08:50 PM   #19
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Jimway, do boat motas have vacuum advances, I don't think my 1989 270 horse Chevys have vacuum????
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Old 06-02-2020, 10:24 PM   #20
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Typically no but you will find some here and there. Trying to cover all the bases with the questions. You never know what your going to find or who did what. Seen plenty of rigs with standard starters, water pumps and alternators in there instead of marineized components. Some boats will benefit from vacuum advance, think big engine (no replacement for displacement) and light load. In a jet drive as an example, you can save maybe a gallon of fuel per hour. You might not use a lot of advance and have it start coming off around 8 inches of manifold vacuum. If the power valve is set lower than that then the advance is gone by that time.
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