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a 1409 is exactly what you need - 600 cfm. works well on my Chevy 5.0 l vortec. easy to tweak. A 600 would be too small for a 454 so would be good if they re jetted it to reset it to factory jetting and step up rods. Hard to tell but dosent look opened. You can easily take the step up rods out...

I think bravo and Alpha transoms are different parts as they have different part numbers.. the cutout in the transom is the same but that's it. There are several transom assys used on ebay at moment. Would look to buy one from a freshwater location vs saltwater one...

Well played, but you must be bored...

or in the metric system 10 meters of height is 1 bar of pressure ….

I dont think the 2 jet flows a whole lot more than 350 cfm https://www.chevelles.com/threads/cfm-rating-of-rochester-2-jet.70824/#post-468677 also dont think the rochester and holley use same bolt pattern but could be wrong there if it is running ok now save your money for an intake and 4 bbl.

Exactly made in china isnt the issue it is the qc standards of the organization And if it is not a counterfeit part. years ago my grandfather always used to call made in japan “Japanese junk“. Didn’t take long for that to change.

Get a factory shop manual i want to say number 14 , very helpful. i did mine last spring might be worth doing the trim limit switch and sender while in there. Need a BF slide hammer to get gimbal out but look at it first . My boat is a 2004 bellow never leaked so i have the factory greasable...

It is used to align the engine but that is only the coupler and gimbal bearing which are a few inches apart There are likely many you tube videos on this. Looks for some so you get an idea of how it works in an alignment Don’t over think it as it is not rocket surgery

I think really comes down to temp rating some tubing is only good for 140F that probably wouldn't work long for down stream of thermostat but if its raw water coming up from the drive likely no issue Kenny has been around the block a time or two so can't imagine it wouldnt work based on his...

pretty sure people only stab it in for testing

Do you have spark when it doesn't fire, test with a spark gap tester off the coil and at the plugs

Definitely looks good. Have to see under load. looked like in second video there is a little slop in the linkage to accelerator pump. Just make sure that there is no delay in actuating the pump arm. If there is some slop just straighten the rod so the pump spring is under a little tension. Had...

There is a ball down stream of the pump that can get left out if you take the venturi cluster out. Would suspect either this ball the check ball in the pump well ( they are two different sizes so can get mixed up) or the spring are not in the right orientation. is a video on it. You can test...

I also keep a spare module in the boat. Used one off ebay. Probably buying it will ensure I will never need to use it... So the plug wires were bunk? I've stopped buying most aftermarket items too many bs stories like this lately.

Not exactly your engine but you can see at a given rpm range what a carbed 4.3 will burn in terms of GPH. https://www.boat-fuel-economy.com/new/mercruiser/mercruiser-v6-190-hp this was fairly accurate for my 5.0 in terms of gph consumed.

Try the man overboard switch. If tripped it will run briefly but when key is taken off start to run position it will cut of ignition. If that doesnt do it does it have 12 v on positive side of the coil when this happens? Can also try dribbling gas down carb to see if you can keep it running...

There’s two cracks there right ? On below head and one above pan rail ? Had good luck with this method on mill casting at one of my old jobs years ago was a permanent repair

Didn’t notice that but yeah his last post was end of july 22…hopefully nothing happened to him always a good technical poster

@achris tagged him here he is referring to the cast exhaust elbow on top of the exhaust manifold. In salt water these are corrosion prone. Fresh water they usually are lifetime unless over heated or freeze damaged.

Somewhere on here is a dimensioned drawing of one. Just check it when u get it