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post #1 of 20 (permalink) Old Oct 29th, 05, 09:03 PM Thread Starter
 
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engine vib

I have a 383 stroker. The engine vibrates more then just the cam shake. Even if I give it more gas, it doesn't smooth out. I went from a holley 750 to a holley 600. No change. The flexplate isn't broke or warpped, and the balancer isn't bad. What would be the problem? Thanks.
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post #2 of 20 (permalink) Old Oct 29th, 05, 10:17 PM
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Re: engine vib

Are you using a "400" balancer and flexplate?
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post #3 of 20 (permalink) Old Oct 29th, 05, 10:33 PM
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Re: engine vib

A new problem on an otherwise OK engine?
Incorrect ignition lead placement?

Need more info on it's recent history..

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post #4 of 20 (permalink) Old Oct 29th, 05, 11:12 PM Thread Starter
 
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Re: engine vib

yes 400 bal and flex. engine sat for 2 years.
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post #5 of 20 (permalink) Old Oct 30th, 05, 06:08 AM
 
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Re: engine vib

Not trying to sound dumb here but have you done the usual homework and checked plugs plug wires dist cap etc... basically make sure all cylinders are firing properly? Maybe it will be a simple cure. Dont skip checking parts just because it may be new or fairly new sometimes the new stuff isnt always the way it should be.
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post #6 of 20 (permalink) Old Oct 30th, 05, 07:22 AM Thread Starter
 
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Re: engine vib

everypart has been checked and/or replaced. Sparkplugs all are the same firing color. New wires new cap and rotor, new dist.
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post #7 of 20 (permalink) Old Nov 2nd, 05, 10:33 AM Thread Starter
 
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Re: engine vib

how much of a vib would a 350 on a 383 cause?
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post #8 of 20 (permalink) Old Nov 2nd, 05, 10:41 AM
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Re: engine vib

ma,
Before the engine sat for 2 years, did it run ok ? If so it should not be a "balance" problem unless something mechanical was changed, like the flywheel and damper. A 350 damper on an externally balanced 383 will make it shake pretty good.

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post #9 of 20 (permalink) Old Nov 2nd, 05, 09:40 PM Thread Starter
 
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Re: engine vib

no vib before it sat. I have changed the flexplate since then though. I have a feeling they gave me the wrong one. The balancer hasn't been changed.
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post #10 of 20 (permalink) Old Nov 3rd, 05, 05:10 AM
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Re: engine vib

Quote:
Originally Posted by MA69CAM
I have changed the flexplate since then though. I have a feeling they gave me the wrong one.
I think you've found your problem -- flex plate. If you have a 400 harmonic balancer, you need a 400 flex plate because of the weight next to the ring gear.

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post #11 of 20 (permalink) Old Nov 3rd, 05, 07:39 AM Thread Starter
 
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Re: engine vib

does it matter which position I install it? not front to back but which clock position I put the weight.
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post #12 of 20 (permalink) Old Nov 3rd, 05, 10:02 AM
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Re: engine vib

There is a specific place the weight is physically attached. It probably would be best to buy either an OE flex plate or an SFI accepted plate.

This will insure the correct place is obtained.

There is an extra hole for a dowel pin located on the crankshaft flange. These must be aligned.

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post #13 of 20 (permalink) Old Nov 5th, 05, 03:14 PM Thread Starter
 
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Re: engine vib

I looked at the flexplate on the car and there is a weight on it. Now I think that there isn't a dowl pin to install the flexplat correctly. Will know more after I drop the tranny.
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post #14 of 20 (permalink) Old Nov 5th, 05, 06:25 PM
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Re: engine vib

ma,
Do you still have the original flexplate to compare to ? It is possible that you have an internally balanced 383. The fact that there is not a dowel pin in the crank makes it even more likely. Does your damper have a cutout in it to make it "out of balance" like a stock 400 damper ? If not, again ... it could very well be an internal balance engine. Just something to keep in mind.

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post #15 of 20 (permalink) Old Nov 6th, 05, 08:36 AM
 
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Question Re: engine vib

Somebody might have given you a 454 flexplate so take it apart and complare the two.

I say this b/c I still haven't found anybody that can visually tell me the difference between the 400 and 454 flywheels and flexplates except by number.......

I took a chisel/punch and gently marked my two flywheels so I wouldn't forget which is which too!!!!

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