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HELP!!!! 383 Clattering????? #1005110
06/02/11 09:39 AM
06/02/11 09:39 AM
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I have a 70 HP383 with about 1200 miles on it and it seems to clatter when you get to 60-65 mph on the road. I have anew Edlebrock 800 on it and everything else is new. I have a couple of lifters that tick when you first start it for a little while and they are MP with the MP 474 cam. If I had some flat lobes would it be missing some? It doesn't run hot about 180-185. And it has no power at all, I just need to get this figured out. It is 30 over with KB's all balanced with 906 heads and the block and heads were shaved. There is just the one spot where it does this and it starts good. I have replaced the plugs and points also. Does any one have any ideals? Thanks for any help. Ronnie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005111
06/02/11 10:32 AM
06/02/11 10:32 AM
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well have to check my pushrod length , and oil pressure, with another gauge just to make sure i wasnt losing pressure at speed,
start with pushrods first, maybe to short ,, just a thought

Re: HELP!!!! 383 Clattering????? [Re: dennismopar73] #1005112
06/02/11 11:03 AM
06/02/11 11:03 AM
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Florida
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scratchnfotraction Offline
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are you sure its not spark knock with cheap gas and to much timeing?

are you sure its lifter clatter - low oil pressure?


Last edited by scratchnfotraction; 06/02/11 11:05 AM.
Re: HELP!!!! 383 Clattering????? [Re: scratchnfotraction] #1005113
06/02/11 12:00 PM
06/02/11 12:00 PM
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grande prairie , ab , canada
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had the same thing until i threw away the orange oil filter and replaced it with a good one , never going to use orange again


theres nothing as permanent as a temporary fix 70 super bee 79 red express 67 fargo 8o aspen rt
Re: HELP!!!! 383 Clattering????? [Re: scratchnfotraction] #1005114
06/02/11 12:18 PM
06/02/11 12:18 PM
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JohnRR Offline
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Quote:

are you sure its not spark knock with cheap gas and to much timeing?

are you sure its lifter clatter - low oil pressure?







Re: HELP!!!! 383 Clattering????? [Re: JohnRR] #1005115
06/02/11 01:46 PM
06/02/11 01:46 PM
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The push rods are the original ones out of the motor and there is just 1 are 2 lifters doing this and they just do it for a few minutes and stop. I have a Mopar oil filter on it. My gauge just works when it wants to but when it does it idles around 40-50 lbs oil pressure. The clatterng isn't bad and I'm probaly the only one that can hear it and it is just there for a certain speed. If I let off are give it gas it stops. What direction do I go with the dist. to back the timing off? It just doesn't have the power I think it should have. So every one just bear with me, I'm not much on these kind of troubles but I really thank every one for the advice and help. Ronnie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005116
06/02/11 01:51 PM
06/02/11 01:51 PM
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GomangoCuda Offline
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Quote:

What direction do I go with the dist. to back the timing off?




This question tells me that you are not using a timing light which makes it very probable that your problem is timing related.


In theory, there is no difference between theory and practice. In practice, there is.
Re: HELP!!!! 383 Clattering????? [Re: GomangoCuda] #1005117
06/02/11 01:53 PM
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We used a lite on it to set it. Ronnie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005118
06/02/11 02:03 PM
06/02/11 02:03 PM
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Quote:

We used a lite on it to set it. Ronnie




what did you set it at?

did you use a vac gauge to set the idle air screws on the carb?

let off gas or give it gas and it stops

sure its not an exhast leak?

retard timeing will kill off the power

advance time will add power till you go to far,then it will rattle and not have power

Last edited by scratchnfotraction; 06/02/11 02:03 PM.
Re: HELP!!!! 383 Clattering????? [Re: okie] #1005119
06/02/11 02:06 PM
06/02/11 02:06 PM
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Brookeville, Md
Mr.Yuck Offline
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Is the clatter new? was the engine always a dog? Could be a few things. Torque converter bolts?


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Re: HELP!!!! 383 Clattering????? [Re: Mr.Yuck] #1005120
06/02/11 02:13 PM
06/02/11 02:13 PM
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Marysville, O-H-I-O
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so it's only at part throttle cruise on the highway....check your timing (sounds repetitive, huh?! ) it could be the vacuum advance is pulling too much timing and you get spark knock, but with less throttle, there's not enough air to get spark knock, and with more throttle there's not enough vaccum to advance the timing that far.

just a thought


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Re: HELP!!!! 383 Clattering????? [Re: 70Cuda383] #1005121
06/02/11 02:52 PM
06/02/11 02:52 PM
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Oklahoma City
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Spraygoon Offline
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I got bit one time by installing the crank gear for the timing chain in the wrong position, the engine ran but was pretty week, once it got over 3000 rpm, the rhoades lifters pumped up and the valves started tickling the pistons or "clattering". To check it, roll the engine until the intake or exhaust valve is completely open. Shine a light down where you can see the lifter plunger top out and see how much slack you have left before the valve contacts the piston
If your engine will rev above 3-3500 without losing any more power this is not your problem.


Paul Reber
Re: HELP!!!! 383 Clattering????? [Re: Spraygoon] #1005122
06/02/11 03:52 PM
06/02/11 03:52 PM
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Lincoln Nebraska
RapidRobert Offline
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Lets see if it's spark knock (pinging). Pull the vac hose off & plug it (the hose) w a golf tee & take it back out & see if that makes it any better


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Re: HELP!!!! 383 Clattering????? [Re: RapidRobert] #1005123
06/02/11 07:06 PM
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It was set on the timing marks at O-O I think. I will plug the vac.line and drive it and see what happens. I had a guy set the timing and he didn't put a vac. gauge on it. The motor starts really good where it is set now just don't seem to have much power. Ronie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005124
06/02/11 09:46 PM
06/02/11 09:46 PM
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Sebring, Florida
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Remove the vacumn line from the distributor and plug it, run the rpm up to about 2,000 and set the timing at 34 degrees. If this doesn't correct your problem you still need to have the timing set at 34 degrees +/-.

Re: HELP!!!! 383 Clattering????? [Re: Mopar Grandpa] #1005125
06/02/11 10:00 PM
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How do I know where 34 degrees is? I'm not to good on this stuff. I'm sure he set it on the timing marks on the motor. I asked him about that as the cam was supposed to have been degreed in it. Ronnie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005126
06/02/11 10:03 PM
06/02/11 10:03 PM
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Sebring, Florida
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You will need a newer timing light that you dial in (on the timing light)in order to set the ignition timing properly. Your distributor should be at full mechanical advance at 2,000 rpm and this is where it needs to be set. You can also buy a timing tape for the harmonic balancer (Jegs or Summit)that has the degrees on it but they very seldom stay stuck for very long.

Last edited by Mopar Grandpa; 06/02/11 10:07 PM.
Re: HELP!!!! 383 Clattering????? [Re: okie] #1005127
06/02/11 10:10 PM
06/02/11 10:10 PM
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heres a fast way to set the timeing with just a vac gauge on a full vac port off the carb...

hook up the vac gauge to the carb port for full vac at idle.

advanc the dist/timeing till you get your highest vac reading.

then back it down one #( example..high is 19,back down to 18) then snug the clamp on the dist so it wont move.

test drive it,that will get you in the ball park.

if it still does the clatter..then test it with dist vac pluged like posted above.

when you have a light on it,note where the timeing mark lines up on the timeing tab for later referance.

if its a aftermarket cam it may want more advance,so it may go past the #s on the tab..so you estamate it a little.

one thing I have learned..what is said to be done does not allways mean it got done correctly


Re: HELP!!!! 383 Clattering????? [Re: scratchnfotraction] #1005128
06/03/11 06:33 AM
06/03/11 06:33 AM
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It is a Mopar purple cam and I can't find my papers to it. Ronnie

Re: HELP!!!! 383 Clattering????? [Re: okie] #1005129
06/03/11 07:02 AM
06/03/11 07:02 AM
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Granite Bay CA
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Heres a few ideas....
As said, check the torque converter bolts. They will rattle if the engine is under very little load or on the rev down.
Are all your rocker arms in the correct positions? Is it possible that you have them out of order? Intake rockers in the exhaust position or vice versa? This will cause the pushrods to be off center and maybe increase the lash.
Physical interference with the engine or exhaust to the body or other obstruction?
Worn out motor mounts causing a metal to metal contact?

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