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Old 07-06-2009, 11:47 AM
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350 no power

hi my names james i got a 1987 firebird with a 350 cam 202 heads performer rpm intake headers and edelbrock 600 carb with th400 transmission and 2100 stall. It runs prety good at idle but when i go to drive it it just wont get up I thought it might be my timing but it does the same thing no matter where its set. I also readjusted my valves and they seem to be fine also when i drive it the rpms dont seem to climb like they should. I had the car running great before i put new head gaskets and the th400. If someone could help me out i would really apprieciate it thanks.

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Old 07-06-2009, 12:25 PM
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350 no power

I bought the engine with the cam and heads droped it in my firebird with the 700r4 that came with it droped the distributor in adjusted my valves and drove it it ran awsome but i blew the tranny and a head gasket so i got the th400 with a summit 2100 stall. I put it back together droped the distributor in adjusted the valve and went to drive it but it didnt run right so i tried to power brake it and it will barely turn the tire ive tried puttin the distirbutor on diffrent teeth but everytime i go to face the rotor towards the #1 spark plug it wants to start hard like its to advanced so i had to move it back a tooth and it seems to start decent and idle good but still wont get on it goin down the road ive also gone through my valves a few time but they seem fine. Another thing is when im tryin to drive it the rpms wont climb for nothin hopefully that will help thanks
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Old 07-06-2009, 12:30 PM
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If the valve's or to tight,It will not run right. Make sure you have the valve's set right.
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Old 07-06-2009, 12:40 PM
How fast is fast enough?
 
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You need to set your timing with a light, and did you make sure you used a gasket that would get you good P2H clearance? its just a small thing but it helps and is relatively easy to do with a chevy 350 as there are MANY gasket choices out there.
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Old 07-06-2009, 12:43 PM
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Here is my 2 cents worth.

The difference in gear ratios, between a 700R4, and a TH400. You may have to change the rear gears to match the gear ratio in a 700R4.
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Old 07-06-2009, 12:55 PM
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thanks for the info

Thanks for all the ideas hopefully i can get this thing runnin like it was before
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Old 07-06-2009, 01:05 PM
How fast is fast enough?
 
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carsavvycook brought up a great point! the 1st gear of the 700R4 is more burnout friendly.
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Old 07-06-2009, 02:28 PM
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Sometime people install a big cam and the result you loose low end torque with all the torque gone upstairs. It's like squeezing a balloon at one end and come out the other end. You may have to go to higher stall converter were the cam start producing torque, or change the rear end gear to a higher gear ratio. It even worst if you have a low compression engine.
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Old 07-06-2009, 05:33 PM
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Quote:
Originally Posted by carsavvycook
Here is my 2 cents worth.

The difference in gear ratios, between a 700R4, and a TH400. You may have to change the rear gears to match the gear ratio in a 700R4.
thats what i would say too... the 700r4 has a 3.06 1st gear ratio, and the th400 is 2.48. theres probably nothing wrong with the engine, get it wound up and it'll probably cook. just not gonna have the get up and go like it did with the 700.
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Old 07-06-2009, 06:06 PM
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Case in point

Quote:
Originally Posted by tnsmith10
thats what i would say too... the 700r4 has a 3.06 1st gear ratio, and the th400 is 2.48. theres probably nothing wrong with the engine, get it wound up and it'll probably cook. just not gonna have the get up and go like it did with the 700.
What is the stock rear gear ratio in a 1962 Corvette? 4 speed of course.

The owner had a 383 stroker built for it, and was not happy with it's performance. The shop working on it, even modified the heads, intake, and carb, for another 3K. It still did not perform, so he (a employee at a GM dealership) purchased a IIRC 502 BBC and had it modified for even more power.

He made a deal with one of my customers, which I had recommended a 383 stroker to, for his 1968 Camaro. 3K installed. My customer had to buy a 'shaker' hood, so the air cleaner would fit under it. This '68 Camaro had already been changed to a 373 rear gear ratio, and with the 383 stroker this Camaro is soooo........ fast.

The 2 vehicles met on a local highway, and the Camaro 'smoked' the Corvette. Last I heard the Corvette is for sale.

I just find it a waste of money, that the "shop" had not figured out, or even suggested a rear gear change to the owner of the Corvette.
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Old 07-07-2009, 05:59 AM
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Quote:
Originally Posted by carsavvycook
What is the stock rear gear ratio in a 1962 Corvette? 4 speed of course.

The owner had a 383 stroker built for it, and was not happy with it's performance. The shop working on it, even modified the heads, intake, and carb, for another 3K. It still did not perform, so he (a employee at a GM dealership) purchased a IIRC 502 BBC and had it modified for even more power.

He made a deal with one of my customers, which I had recommended a 383 stroker to, for his 1968 Camaro. 3K installed. My customer had to buy a 'shaker' hood, so the air cleaner would fit under it. This '68 Camaro had already been changed to a 373 rear gear ratio, and with the 383 stroker this Camaro is soooo........ fast.

The 2 vehicles met on a local highway, and the Camaro 'smoked' the Corvette. Last I heard the Corvette is for sale.

I just find it a waste of money, that the "shop" had not figured out, or even suggested a rear gear change to the owner of the Corvette.
from what i could find, that corvette came with a t-10 manual, and it had 2 options, 2.20 or 2.54 1st gear ratio.
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Old 07-07-2009, 07:06 AM
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According the Road & Track, 1962 and 1963 C1's had the same rear gears available to them. If so, they were 3.08, 3.36, 3.70, 4.11, 4.56. There was a guy on the Corvette Forum who said he had a 3.55 as OE in his '62.

IIRC, the solid lifter engines got the 4.11 standard.

3.36 was standard for 3-speed cars, I'm not sure what was standard w/the 4-speed cars.
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Old 07-07-2009, 05:37 PM
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when will it rain???
 
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thx colbalt, good catch there. i copied his post and still didnt read it right. lol, thatll teach me to answer a post 1st thing in the am before ive had my coffee. lol
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Old 07-07-2009, 05:44 PM
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Quote:
Originally Posted by tnsmith10
i copied his post...
Actually, I did a cut and paste of the tranny ratios you posted- I had the Muncie ratios, but not the T-10- so it's all good!
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