Motor plans....once more
Now that the trusty little 1500 hour 4.3 is burning a bit of oil on start up, I have decided that it is time to either get a new motor, or rebuild this one. I was thinking of a new 4.3 Vortec, 225 hp over my 175, but thats around 2200$ plus shipping. So I figure we can go up to michigan, and rebuild it with my step-grandpa. I was sure to tell my dad that you cannot re-use heads or pistons from the original motor, and that when rebuilding it is a lot wiser to bump up the compression ratio to 9.5:1. So I will be on the prowl for some .030 over 350sbc pistons at the 9.5:1 cr, NEW Vortec heads and intake, 4V carb, not sure on what size? new drive impellor, maybe a crossover tube, new valve covers, thru-hull :D
Does anyone have a good hp estimate? What does it cost to overbore .030" a V6 4.3? (350-2 cylinders) What size carb? 262.2cid, 5000max Any other little things that might add a few ponies? And does anyone know of any of these for sale cheap? What size prop on a 1.84? Now it is 175hp, 14x19 stainless to 5k. Thanks, Tommy |
Re: Motor plans....once more
Originally posted by HyperBaja Now that the trusty little 1500 hour 4.3 is burning a bit of oil on start up, I have decided that it is time to either get a new motor, or rebuild this one. I was thinking of a new 4.3 Vortec, 225 hp over my 175, but thats around 2200$ plus shipping. So I figure we can go up to michigan, and rebuild it with my step-grandpa. I was sure to tell my dad that you cannot re-use heads or pistons from the original motor, and that when rebuilding it is a lot wiser to bump up the compression ratio to 9.5:1. So I will be on the prowl for some .030 over 350sbc pistons at the 9.5:1 cr, NEW Vortec heads and intake, 4V carb, not sure on what size? new drive impellor, maybe a crossover tube, new valve covers, thru-hull :D Does anyone have a good hp estimate? What does it cost to overbore .030" a V6 4.3? (350-2 cylinders) What size carb? 262.2cid, 5000max Any other little things that might add a few ponies? And does anyone know of any of these for sale cheap? What size prop on a 1.84? Now it is 175hp, 14x19 stainless to 5k. Thanks, Tommy |
I have to work. :( Oh well, at least it is in the morning, can boat all afternoon and night.
You gona be here on June 21? |
YEP.
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Hey Hyper
Why not just put in a 350? I bet it wouldn't cost much if anything more than building a V6. |
Ray, that is what a few hundred of us have been saying for the last 6 months.....HeHeHe...
Just teasing ya Hyper.....;) |
Hey Tommy
Don't forget to tell your dad that you need a new "air filter cover" you know the kind that has all the belts and makes that whirrrring sound.
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I think it's a great idea to rebuild an engine at your age. My first car I bought, I had to do a major overhaul.......bearings, rings, etc. I know he was real proud sitting in the house with my uncle while I was under the car installing bearings. You will learn a lot about what makes the engine work if you have had one completely apart. You will learn things that you will never forget. I can remember like it was yesterday, and that was 31 years ago.
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If it is only smoking at start up, it is most likely the valve guide seals. They can be replaced without pulling the head. Keep in mind you can buy a LOT of oil for $2200.
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The GM 350 is around 2800, then I need new exhaust, that will be a good 3500$, plus the fact the boat dosent handle as good and gets worse gas mileage (Didnt that last comment sound a bit queer?)
Buying new I could get those parts for under 1,600$, can keep same exhaust, same mounts, same flywheel, etc. I figure that will be cheaper, a bit more of a sleeper, V6 will have good gas mileage, etc. |
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