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you should be able to shift and alph by manipulating the lower cable with two fingers, should move that easily. If it doesnt pull the drive and look for debris or sticking swivel shaft or dragging shift cable. Manual #14 will help with this

what prop is current on it and what rpm is it getting at WOT? Best is relative to what you want to do with the boat. As Scott laid out thats a big boat for that engine so pitch will be low

agree with comments above. You can put two marks with a punch on the inner splined hub and the outer ring to see if it is moving. Most likely it will not be moving. these are pressed in and over time (years ) they can slip

I have also had several 2 jets- grandfathers 1966 Penn yan merc 150 hp 1965 Lemans 326 2bbl 1965 GTO has 3 of them (tripower) 1991 Sea Ray - 3.0 had a mercarb Only real difference I see is the mercarb has one mixture screw vs two.

Yeah all these carbs (Holley, AFB/Eddy, Q-jet, Rochester 2 jet) have their pluses and minuses. I have also found on both my 65 Pontiac and the boat the AFB/Weber/Eddy carbs to be really a great carb for ease of use and tuneability , especially for less experienced tuners. Anyone who tells you...

one or both throttle plates may be upside down and not closing. Are you setting idle speed with the throttle cable disconnected? Are the throttle blades exposing the transfer slot? This could add fuel that the mix screw will not control. normally this is seen on hot rod engines with big cams...

The mercarb is a descendant of the rochester 2 jet so yes uses a vacuum piston in the choke element housing. Very similar to the holley electric chokes

I found the same thing with the base gasket. Your edlebrock has the same square and spread bore mounting that my intake does. There is very little sealing surface in a couple spots on the secondary side with webber/eddy carbs. I found this when installing a phenolic insulating spacer. The...

The TB module is either mounted to the dist or on the exhaust elbow. Both are black boxes, sometimes with a knock module. just google 4.3 delco est. there are original Delco units and aftermarket knock offs. Sierra has units that are considered good. if I was in your shoes I would look for a...

choke pull off on a mercarb is inside the choke element housing. Its a piston behind the element vs a separate diaphragm with hose like a qjet or divorced choke to the op this like shows the adjustment of the choke by bending the linkage

you may need to bend the linkage to get it to the correct opening amount not just adjust the element which is more for the amount of time it stays closed. Did they properly set the idle mix and speed ? In warm weather it should really not need much choke anyways if properly set up.

It seems to be hit or miss with the est modules , also finding an actual delco est is not as easy anymore. Mich Motorz no longer carries actual Delco for the 4.3 and 5.7, only the 3.0. When I bought my repower partial engine from them in 2015 they normally supply them with the EST. I had them...

friggin auto correct... I meant the Merc TB (thunderbolt) is a great system, Merc just screws the owner by NLA or insane ignition module prices... so when the module dies a actual Delco Est (not cheap knock offs) is a good relatively drop in replacement. Yes the trigger sensor is not a bad...

Why would you replace the ignition system if it’s working? The atB is a great system until the ignition module needs to be replaced $$$. Then typical replacement is a delco est. this isn’t any better except module rEllacement cost. Both are OEM quality systems.

not that it matters but the Iron Duke engine is a 151 CID Pontiac engine from the 80's, the marine 2.5 are Chevy based 153 CID engines that debuted in the chevy II in 1962, which was later made into the 3.0 marine and industrial engine. Good news is if you do need a new engine you could swap...

25 would make sense as the 4.3 2 bbl is rated at 190 hp, the reman 4.3 with 4 bbl webber eddy is rated 225. I had heard somewhere on here that it takes 10 hp per 1 mph but can only assume the hull has something to say about it. I found the midrange throttle response on the 4 bbl to be way...

A lot of tire kickers? I just went through selling on of our cars on marketplace, older vehicle for not much money, go so sick of it I gave it to a friends son who just totaled his car on a deer.

worth doing as in dash tachs tend to drift over time. if its off you may be hitting correct WOT rpm already.

Again find a different mechanic. Ask them to show you the published compression numbers in the mercruiser manual, it’s 150 psi… please do not spend any more money with these guys have they verified your tach against a shop tach ?

100% 150 is new , get a different mechanic. 3.0 is a great motor for economy of ownership and reliability, not speed. Yes you should be able to get it to 4600-4800 rpm but that is probably prop related. When I had a 3.0 I ran a 16” prop for skiing etc , may need to drop in pitch.