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  1. thundercat 9

    overcharging and boat won't shut off

    Hey guys, I think I have a grounding "gremlin". At first, the volt meter on my dash started reading between 14 and 16 volts so I took my meter and checked the battery and sure enough, it was between 14 and 16 volts depending on the RPM of the engine. I put a new alternator in and still no...
  2. thundercat 9

    replace 260hp 350cid with LT1???

    Hey guys, I just got my hands on a LT1 350 vortec motor out of a 95 buick roadmaster stationwagon, is it a good motor to replace my 87 merc 350(260hp) with. Should I put a different cam in it to bring the powerband down to around 4500rpm or is it already there? I run an Alpha 1 outdrive...
  3. thundercat 9

    adjust carb before timing???

    Hey guys, I checked my advance with a timing gun, it does advance when I rev the motor. My next question is should I adjust my carburator idle speed first and if so, what is the procedure? It is a rochester "quadrobog" 4 barrel. I think my idle could be off to begin with which I think would...
  4. thundercat 9

    Sounds like spark knock...

    Hi guys, I have a couple of questions, but first I'll tell you about my problem. I replaced my harmonic balancer on my 87' merc 350/260hp with a thunderbolt IV because the original one had a little wobble, also when I originally set the timing to 8deg BTDC, I used the "mark/line" on the...
  5. thundercat 9

    exhaust coming out riser???

    Hey Guys' I just put my 350 merc motor back in the boat(after replacing the starboard head) and was doing some testing just to make sure that it ran cool. I checked the flow diagrams and all my hoses are on right. I pulled off the hose between the T-stat housing and the...
  6. thundercat 9

    Bimini top???

    Has anyone attempted to fabricate a bimini top for their boat? I would like to try it....I would probably use sunbrella....but what would I use for the tops framework? thanks Jeff
  7. thundercat 9

    merc 350 heads

    What is the difference, if any, between heads on a merc and heads from a normal 350? Not withstanding the differences in CC's. Do any automotive heads cross over? Where can I find a good head,new or used? My motor is an 87' 350 merc, 260hp. thanks jeff
  8. thundercat 9

    pic of my new-used boat

    Anyone know something about this boat? Besides the fact that the skipper looks pretty good in it...:D
  9. thundercat 9

    Hello iboats...

    I am new to the boating community and as such, have been doing alot of reading in this forum. I've found lots of great info, which I'm going to need because I have to do some motor mount and stringer repair/replacement.Anyway, the boat I have is a 1987 Century 4500 XL, does anyone know anything...
  10. thundercat 9

    87 century 4500 lx cc

    I recently jumped into the boating world with both feet.I purchased an 87 century 4500 with a 350 merc/260 hp and merc outdrive. I would love to find out were I can find manuals,etc for this boat. Any info would be greatly appreciated. jeff
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