[dubldoc]

Hello everybody!! I desperately need help with my new 2001 Z-272 Shabah 8.2L, all comments tremendously appreciated.
#1- Got Screwed by seller, leakdown test shows 80# compression in one cylinder and idles rough..high end boat shop advises either run til blows up or pull heads and see if a valve job will do (290 hours), or full rebuild if not. I saw Merc gets 14k new, or Daddy-O marine in Ft Lauderdale will send a longblock from GM Marine for 7195 w/o shipping. Rebuild option is just as expensive but includes several hrs of dyno time from a race boat building company with a great reputation. My headers were pressure tested and they came out fine.

I don't mind spending an extra10K for a boat that commands such a devoted cult following..and I just WOWWW!!! all over when I rev the 500HP engine going under the bridge!!
I understand a few people did comment that water can sometimes enter the engine if stopped quickly,,I am not sure if there are OEM flapper valves on this boat or if they are recommended by others if not. My mechanic suggested I consider this.

#2: Seats are in poor condition. Any good advice on replacements for all of these seats?? Can I get some kind of a bolt on replacement for the electric adjustable seats?

#3: Suggestions for dashboard replacements?

[csterner]

Wow! Well, welcome aboard. Sorry you got screwed like that. Here is what I can help with...
If you do not have straight thru hull exhaust, then Yes, you should have exhaust flappers that are located aft of your risers. If you have captains call exhaust, you should be able to remove the exhaust elbow and see them. They are important to keep water from back flowing into the engine. Your thru hull tips should also have flappers as well.
Not sure of a bolt on placement for the seats. I was going to remove mine from the boat and take them in somewhere to have redone. Do the electric seats still work? Mine are still hanging on, but the vinyl needs redone.
As far as dashboard replacement, good luck finding a complete replacement. I did the redneck fix on mine and it came out great. All I did was replace the switch actuators and literally used texture spray paint on the plastic. Sounds stupid but I don't have $1,000 to have a custom fiberglass piece made and have it dunk tanked with wood grain. So I am happy! Here is the link to that thread...

Almost finished with dash




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[Motoxxx43]

I am not sure of your mechanical abilities or tools/equipment at your disposal but 10k would be a lot to put into that 502. I would think having the motor pulled an rebuilt would not cost a 3rd of that. I'm sure there are some good shops down in your area too.
As for the upholstery you'd have to call around or go meet with some people an get some solid prices. I had some stuff done at an auto upholstery place. They ordered in some marine vinyl an it came out great. Keeps us updated on the situation. Curious how the motor goes for you. I have right around 320 hrs on my 454.

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[Oregondunes]

here are some options:

Nice 502 Mercruiser 390 HP engine for sale - Offshoreonly.com

Pair of bbc 502s efi complete turn key - Offshoreonly.com

Gen 4 bowtie 502 shortblocks - Offshoreonly.com

[dubldoc]

Thanks for the note! Yes, I have the captains call exhaust ($$$) and I will mention to my mechanic to look for the in line flapper. I don't see the flappers on the thru hull exhaust tips (4-5" chrome, right??)
My electric seats work fine, but they do need a recover..I was thinking of getting an aftermarket seat to replace them if estimates for recover are too high, suggestions anybody?
Rear power lift seat over engine bay works fine.

Yes, I thought a GM marine longblock for 7200 was pretty damn good (Daddy-O in Ft Lauderdale), but my mechanic swears by his performance shop in Bradenton, with lots of dyno time thrown in. Rebuild for an 8.2L is WAYY more expensive than a 4.3 or 5.7 since you have everything from a roller cam to special 90mm high dome pistons, special rods, etc. ..I've seen lots of 5.7 rebuilds for 3500 for example. And my stock 8.2 is rated at 470 ponies..

Luckily, I have a bit more $ than boatbrains, and I really want this project to come out right since I intend to spend a lot of time on the water..just not like the guy across the street from me who has a 41' Donzi with TWO 525 Merc HP motors..does at least 90+...went on the Poker Run last week and blew 5k on damage to a prop and skeg..too rich for my blood.
I look forward to letting everybody know how things turn out.

Oh, yeah..I'm told that with still water and a factory fresh engine I should pull 60+mph, anybody know orig factory top end??

[dubldoc]

Thanks Oregon. I assume you have the rear thru hull chrome tip exhaust on your 302?? Do you have flappers on them?

[Oregondunes]

Originally Posted by dubldoc

Thanks Oregon. I assume you have the rear thru hull chrome tip exhaust on your 302?? Do you have flappers on them?

no thru hull, only thru prop

[csterner]

I have the stock captains call and the flappers for my thru hull are not on the outside like some, they are on the inside of the exhaust tube. Probably about 12" in from the outside.


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[dubldoc]

Thanks Chris, I owe you for that!! I'll let my mechanic know. I am curious why SOME Cap'n call exhausts would have outside flappers, but not others..? Aftermarket add on's?? If anybody else could comment in that regard I'd appreciate! I'll have my guy look for any old mounting holes on the tips, but I don't remember any.

PS, what is top end on you 275, and what HP rating??

[csterner]

No problem at all dude. I have a 6.2L in mine which I believe is 320hp. I typically can squeak 49mph with 4-5 people in flat seas and trimmed absolutely perfect. I have shown 50 on GPS before, but lets be conservative and say 48-49.


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