73 challenger 340 no top end power - Mopar Forums

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Old 06-18-2011, 03:01 PM   #1
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73 challenger 340 no top end power

have a 73 challenger has a 340 bored 30 over have gone threw engine and had heads done lets say the works. and at idle and low rpm it runs fine but wen i drive it runs fine till about 4000rpm its pops and spudders and has no power ......can anyone tell me what this could be thanks
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Old 06-18-2011, 03:05 PM   #2
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oh timming is 2 b4 top dead center or tdc
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Old 06-18-2011, 05:17 PM   #3
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J -

Do you know what your total advance is?

A few random shots:

You might not be getting enough from the dist or vac advance.

Unfortunately too lean an A/F mix or restrictive exhaust can case the same thing. What kind/size of carb do you have?

Silly question, but you don't have a rev limiter on the ignition, do you?

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Old 06-18-2011, 06:51 PM   #4
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Ignition breaking up

carb way too lean

floating valve springs, caused by several things--weak, wrong install height, lifter adjustment, etc

flat cam lobe
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Old 06-18-2011, 10:01 PM   #5
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no rev limiter ....and carb is a holley 750 with dual feed lines may need to clean it out cause found some dirt in the rear bowl could be why cause wen i get to 3500 i try to give it about 80% throttle to listen to see if the rear butterflies open but i hear nothing may be problem now to think of it.. and dont know what a total advance is can you tell me more????
Thanks
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Old 06-18-2011, 10:41 PM   #6
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It could be as simple as a bad power valve in that Holley.

http://www.angelfire.com/fl4/pontiac...lleyInfo2.html

Last edited by Silverick; 06-18-2011 at 10:56 PM.
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Old 06-19-2011, 07:21 AM   #7
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Good tech on ignition. http://www.diamondbackengines.com/te.../ignition-101/
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Old 06-19-2011, 04:42 PM   #8
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Quote:
Originally Posted by Archer View Post
J Silly question, but you don't have a rev limiter on the ignition, do you?
I've learned that if the ignition box is slighly wired wrong, the effect of this will act as a rev limiter. I would suggest to just make sure all of your wiring is where it is supposed to be.
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