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Anyone know anything bout T/A's?

 
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Old 06-14-2010, 05:53 PM
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Anyone know anything bout T/A's?

I know its a bit off topic cuz its not a prelude but stay with me here. My buddy has a 79 trans am we've been putting together. His 403 seized and he replaced it with a chevy 350, stock trans (he refurbed it). Of course the 350 in question was out of a damn truck, so we had a hell of a time getting it to fit. Had to weld in the motor mounts.

Anyway he's got it running (sort of) everything is connected and hooked up, we're just trying to get everything in place. It starts but won't idle. Unless he keeps giving it gas, it dies. We checked the fuel filter, there was crap in there (prolly from gasket sealer used on fuel pump) and cleaned it out. Basically we're trying to get the base timing set, just enough so it will idle so we can use the timing light and accurately set the timing.

Anyone got some ideas? Got I sound dumb but totally out of my element here. and by ideas I mean how do we set the dizzy timing enough so that it will idle?
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Old 06-14-2010, 10:09 PM
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Re: Anyone know anything bout T/A's?

Does is have an idle adjustment? I'm really no help. And for the dizzy, you can just loosen it and turn it by hand... Well you can in my moms grand am, and they're both pontiacs :P

Sorry, not much help, just tryin to give some idears.
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Old 06-14-2010, 10:57 PM
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Re: Anyone know anything bout T/A's?

Timing, and/or carb adjustment. First make sure the idle adjustment on the carb is right for a 350 chev, then use a timing light to put it to a stock timing, maybe a few * advanced.

All i can really say is have fun, and welcome to the world of carbed cars.


EDIT: oh and for the initial install did you put everything to TDC?
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Old 06-14-2010, 11:25 PM
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Re: Anyone know anything bout T/A's?

^^^^^ read my mind. dude get cyl 1 to TDC then rotate the dizzy to get it on point.
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Old 06-15-2010, 01:20 AM
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Re: Anyone know anything bout T/A's?

a Ex friend of mine had a 78 camaro with a 350 in it he had the same problem, we ajusted the idle
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Old 06-15-2010, 07:10 AM
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Re: Anyone know anything bout T/A's?

Hows the fuel pump, did you upgrade it to suit?
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Old 06-15-2010, 09:57 AM
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Re: Anyone know anything bout T/A's?

It has the old school vacuum advance distributor? Make sure it is working correctly by disconnecting the vacuum line. You can also try hooking a hand vacuum pump to it to try and manipulate it to make sure it is working.

Aside from that, check and make sure the carb isn't dirty, and that your idle adjust screws aren't out of whack. What vintage truck did this motor come from? Did you use the truck's carb or the TA's carb?
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Old 06-15-2010, 11:40 AM
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Re: Anyone know anything bout T/A's?

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Originally Posted by Adrenaline View Post
Timing, and/or carb adjustment. First make sure the idle adjustment on the carb is right for a 350 chev, then use a timing light to put it to a stock timing, maybe a few * advanced.

All i can really say is have fun, and welcome to the world of carbed cars.


EDIT: oh and for the initial install did you put everything to TDC?
Idle adjustment? lol, I know nothing about carbs man, not a thing. That's his department, and I don't think he's messed with the carb at all. And yes, we set everything to TDC, then we tried to rotate the dizzy to set the "base timing" or whatever just enough so it would idle then we could use the timing gun to get the timing done properly.

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Hows the fuel pump, did you upgrade it to suit?
Fuel pump is the same for the 403. I don't think it has problem getting fuel.

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Originally Posted by Phantom240 View Post
It has the old school vacuum advance distributor? Make sure it is working correctly by disconnecting the vacuum line. You can also try hooking a hand vacuum pump to it to try and manipulate it to make sure it is working.

Aside from that, check and make sure the carb isn't dirty, and that your idle adjust screws aren't out of whack. What vintage truck did this motor come from? Did you use the truck's carb or the TA's carb?
What truck? Like a chevy 3500 mason dump or some shiz. Dunno for sure. We're using the TA's carb, which I think was out of adjustment or broken before we did the swap. He always had to rev it to warm it up otherwise it would stall. Would not idle until it was warmed up, and that was before we did the swap. Now its been sitting for 2 years and we've slowly been working on it when we had the time and money and in between searching for parts.

What happens is he can start it up, and unless he keeps gassing it it'll just die. Oh yea, and the carb blows fire every now and again lol. Which is prolly not good. The air filter is off right now lol.
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Old 06-15-2010, 12:50 PM
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Re: Anyone know anything bout T/A's?

Was the old engine modified? For instance, did it have a cam?

If so, then the carb is most likely not going to be right for the 350. I would get a proper carb for the 350, or at least see about getting the right jets and settings. Is it a 2barrel, 4 barrel? Does it have a manual or electronic choke? I'm no expert on carb'd vehicles, but I've had my hands in enough to know a little bit about them.
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Old 06-15-2010, 12:55 PM
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Re: Anyone know anything bout T/A's?

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Was the old engine modified? For instance, did it have a cam?

If so, then the carb is most likely not going to be right for the 350. I would get a proper carb for the 350, or at least see about getting the right jets and settings. Is it a 2barrel, 4 barrel? Does it have a manual or electronic choke? I'm no expert on carb'd vehicles, but I've had my hands in enough to know a little bit about them.
Now you're starting to get out of my realm of knowledge lol.

Old engine was stock.

I believe 2 barrel. Could be wrong.

No idea about the choke. Its possible it doesn't work, would explain why he had to gas it while it warmed up before we did the swap.
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Old 06-15-2010, 04:02 PM
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Re: Anyone know anything bout T/A's?

Its defiantly a carb problem, it sounds like it is all sorts of screwed up, you may as well get a different one, or at least get a rebuild kit and re-jet it properly.
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Old 06-15-2010, 04:17 PM
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Re: Anyone know anything bout T/A's?

lol I keep telling he's got to get a new one, he won't listen. I think he's gonna try and rebuild it.

When he got the car they like rigged the carb so its open all the time, cuz the butterfly valve or something was stuck...

I have no idea though.
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Old 06-15-2010, 04:39 PM
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Re: Anyone know anything bout T/A's?

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No idea about the choke. Its possible it doesn't work, would explain why he had to gas it while it warmed up before we did the swap.
Bingo. That's a good place to start.


Your best bet is to do some research and find out what size jets are needed for your particular carb to work on a 350. Personally, I would just get a 350 carb. They're stupid cheap.
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Old 06-15-2010, 04:55 PM
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Re: Anyone know anything bout T/A's?

Well it wouldn't be my carb, as it's not my car.

Would a 350 carb work on that? Its a 350 block and head with a edelbrock intake manifold. I'm sure it should fit right?
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Old 06-15-2010, 05:01 PM
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Re: Anyone know anything bout T/A's?

I'm no expert on aftermarket SBC stuff, but I would say yeah it should.
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Old 06-15-2010, 06:23 PM
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Re: Anyone know anything bout T/A's?

Carbs dont really work that way... Almost any old carb can fit any old engine some how. It's just if it is the right CFM for the application.
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Old 06-15-2010, 09:45 PM
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Re: Anyone know anything bout T/A's?

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Carbs dont really work that way... Almost any old carb can fit any old engine some how. It's just if it is the right CFM for the application.
And jetting
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Old 06-16-2010, 12:13 AM
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Re: Anyone know anything bout T/A's?

Whats CFM?

I really, really don't know anything about carbs, or V8's at all. My friend knows alot more than I do but he was kinda stumped on this so I figured there's gotta be some guys on PZ that know trans am's.

Guess I'll just tell him it's the carb, he kinda already came to that conclusion, but his solution is spraying it with alot of carb cleaner. Which will prolly help but if the idle adjustments and whatnot are all off then it prolly won't solve the problem.
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Old 06-16-2010, 12:25 AM
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Re: Anyone know anything bout T/A's?

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Whats CFM?

I really, really don't know anything about carbs, or V8's at all. My friend knows alot more than I do but he was kinda stumped on this so I figured there's gotta be some guys on PZ that know trans am's.

Guess I'll just tell him it's the carb, he kinda already came to that conclusion, but his solution is spraying it with alot of carb cleaner. Which will prolly help but if the idle adjustments and whatnot are all off then it prolly won't solve the problem.
CFM = Cubic Feet per Minute. It's a measure of how much air it can flow.
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Old 06-16-2010, 01:07 AM
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Re: Anyone know anything bout T/A's?

Yeah i have no idea what heads, or intake a truck 350 comes with but for a stock application a 600cfm should be fine, you'd have to look up the jetting for it though.
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Old 06-16-2010, 01:44 AM
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Re: Anyone know anything bout T/A's?

Alright that works. Thanks guys, I'll let him know tomorrow whats up.
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