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I've redone 2 70's Searays with the same furniture issues. In my experience, scrap the seats and buy new ones. You can't reasonably recreate the structure and strength necessary unless you were to actually build and entirely new, complete assembly. And then you need to recover it and that's...

COMPLETE TWIN 4.3 Mercs with Alpha 1's from FRESH WATER, along with ALL parts of a 1987 280 DA. 400 original hours. Hull is totaled. It has serious bottom damage. Boat was not submerged. Includes Raytheon open array CRT radar, water heater and freshwater system, no genset. The only thing...

Got it figured out! Would have been nice if I hadn't snapped the post of the starter solenoid when finishing up, but that was only about a 4 hour waste of time, I'm just happy I was able to change the solenoid without dropping the starter - which probably would have meant pulling the motor. If...

This is a great thread! Very entertaining. The different perspectives always amazes me. They mirror my own experiences with friends locally. I pull my 10 foot beam 27 Sportfish in Wisconsin, it sits 13'10" high. I have all the appropriate permits. It's a pain to get them, but they're under...

It might! Apparently I remembered the model number incorrectly. But I can adjust that in the URL once I find the real model number. THANK YOU! I searched long and hard for that a few weeks ago and came up empty. But just looking at this one tells me that the right manual will clear up some...

First, please forgive me if this has been answered in another post, but after several hours of looking, I didn't find it. I've got an 87 270 Sportfish with twin 260's. Both engines have been replaced, and the wiring has been redone at least once. The isloator tests good. Both alternators...

Thanks Jongus and Collector. The one motor, the 2bbl, the one with perceivably more power, burning less fuel is most definitely Vortec. No doubt about it. And yes, the secondaries on the questionable motor are wide open under load - hence the massive fuel burn. Haven't had time this week to...

Was at the dealer today picking up the plug wires so I bought Mercruiser numbered Delco plugs, and happened to talk to their Mercruiser Master Tech who was behind the counter getting something. He recommended the stock Delco's gapped at .035, so I bought them, put them in, absolutely no change...

More on plugs: Pulled the new Autolite 25's back out, gapped 'em all to .045, where they came stock. That made the vac needle shake even more violently. Pulled them back out, re-gapped them back down to .035, vac gauge settled down a little, but not as steady as it was the first time, not...

I was about a 1/2 step ahead of you. Did some research on plugs today. It had Autolite 145's in it, gapped to .045, I put in Autolite 25's, gapped to .035 per sparkplug411.com (or something like that), a few forums I saw concurred. Should've called the dealer, but didn't. The 25's are longer...

26sxl - The 2 bbl motor could possibly be a 305 - but then I'd be in real trouble, since it's the one running stronger and using less fuel. To any and all: Last night I put a vacuum gauge on the questionable motor. Pulling about 18 inches but the needle vibrates badly. Not by more than 1 or...

OK, WTF??!!! I pulled the boat, which went poorly, but that's another story, pulled both drives off, and checked the drive ratios. They are exactly the same!!! I marked the prop to the casing with soapstone, marked the yoke, turned the driveshaft 1.5 times, and BAM - the marks lined up...

Thanks guys. Sounds like maybe my 25 GPH total burn at 3400 rpm with an incredibly heavy load really isn't that unreasonable then. Obviously there's something wrong that needs fixed, which will lead to better efficiency. But going on that "simple physics" philosophy that somebody brought up...

Chirs, Scorpio, I agree with you both, that's what's driving me friggin' crazy! The quadrabog is a pig, no doubt, but 2x !? I don't think so. I need to swap the drives. I do have a spare drive in the garage, there's no visable stampings on the yokes. Unfortunately I was tied up all...

OK, so I found out that the 2bbl port side motor is indeed a vortec engine. That could explain the perceived power difference. Now I want to figure out if it could explain the double fuel consumption on the 4 bbl non-vortec motor.

Alibuma, very little chance of that. Both the replacement and old motors acting the same? This particular motor that's giving me grief does have the serial numbers on it. I will get that checked out, just haven't gotten around to it. Oddly enough, I was afraid the 2bbl motor was going to turn...

Thanks Scorpio, It could be, I need to get back down to the boat and check that out. Guess I didn't figure I could be lucky enough to get something BETTER than what I thought. And I never realized there was that much of a difference. Do you know what your 5.7's are burning in GPH?

Thanks Larry. No mechanicals on the electrical, Thunerbolt IV ignition. I have not swapped distribiutors - yet. Valves appear to be on, based on compression and leakdown readings, timing, etc. I've had t chain problems in the past, getting an idle is almost impossible. Thanks for the...

Chris, thanks for the input. I have no knowledge of what was swapped when. I did not put the drive on when I swapped the motor, I re-used the drive that was on there. At first I thought the drives deing geared differently was the issue. But then I found the dead cylinder and switched my...

Check NADA.com, they list original retail price. It's ballpark I'm sure, but it's close. I don't think it breaks out the options though.