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From: Jonesboro Ga
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I'm a new owner of a 1980 vette with a 4-speed Muncie transmission. I had the 350 rebuilt to push out 350 HP with a mild cam. The problem I have is when you get on it from a dead start, the car will not even leave a black mark...its like someone has the brake on. I don't know what type of 4-speed transmission I have other than a Muncie. At highway speeds of 65 MPH, I'm turning 3K RPMs. At speeds of 55 in 4th gear, you want to look for another gear to shift out of. I am running new BF Goodrich T/A Radials (225-70-15). I just confused why 350HP won't smoke the tires off. Once off the line it is quick and fast. Any suggestions???
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From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Your really geared down...at least 411's probably more. I had a 69Z with 456's and I did 3000 at 60mph. As far as your starts are concerned, my 1st guess would be timing. Make sure you have enough advance and your dist. is working right.(of course anybody can tell you that) Another thing, with that kind of gearing your going to be hauling a## more than your going to be smoking tires. My car will not set and burn the tires off, but I'm going to be moving on! Vettes get pretty good traction. They squat and go. Larry
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I could lay down a nice patch with my mother's 65 Rambler station wagon that was only running on 5 cylinders 
so I am guessing you got a problem here.
First off, are you sure it is a Muncie in an '80 ? Second, if you rev it up to about 4 grand and you dump the clutch and it doesn't spin the tires I would start looking at how the motor was tuned, timing and fuel induction is where you want to start.
so I am guessing you got a problem here. First off, are you sure it is a Muncie in an '80 ? Second, if you rev it up to about 4 grand and you dump the clutch and it doesn't spin the tires I would start looking at how the motor was tuned, timing and fuel induction is where you want to start.
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From: Troy Michigan
What kind of Torque are you pushin'? You can have all the horse power you want and with no torque you can not utilize all the ponies. If you have big diameter headers and exhaust that will scavage torque.
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From: Jonesboro Ga
When we removed the transmission, it was alummum with 7 bolts on the side cover. First gear has a unique wine in it like an old truck. I ran it up to about 3000 and dumped the clutch. Just bogged down and almost cut off. Could smell a little clutch burn. The engine is tuned with the timing with all advance and mechanical in at 38 degrees. Could all this be due to miss-matched gearing combination?
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Joined: Jan 2002
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From: Marietta ga
It sounds like a carb/ignition advance problem to me....
38 degrees is a lot, but you might not have it advancing quick enough... At what RPM does it get to 38?
I live in Atlanta, but I am frequently in Athens (I see UGA in your name). Let me know if you want me to take a look.
38 degrees is a lot, but you might not have it advancing quick enough... At what RPM does it get to 38?
I live in Atlanta, but I am frequently in Athens (I see UGA in your name). Let me know if you want me to take a look.
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Joined: Jan 2002
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From: Marietta ga
Your timing sounds about right... most likely a carb problem
I would be glad to help any weekend. First things first, if you only have 200 miles on your motor you should not be getting on it hard. You need to take it easy so the rings will seat. If you keep trying to lay wheels your rings will take a **** on you.... and you will burn oil all the live long day.
I would be glad to help any weekend. First things first, if you only have 200 miles on your motor you should not be getting on it hard. You need to take it easy so the rings will seat. If you keep trying to lay wheels your rings will take a **** on you.... and you will burn oil all the live long day.
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Joined: May 2004
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From: Eagle WI
Originally Posted by 80vetteuga
I don't know what type of 4-speed transmission I have other than a Muncie. At highway speeds of 65 MPH, I'm turning 3K RPMs. At speeds of 55 in 4th gear, you want to look for another gear to shift out of. I am running new BF Goodrich T/A Radials (225-70-15). I just confused why 350HP won't smoke the tires off. Once off the line it is quick and fast. Any suggestions???
Gear Ratio = (RPM x tire diameter)/(MPH x 336)
a 225-70-15 tire should be 27.4" tall
Todd
