13 inches

[steve from staten island]

13 inches of vacuum at idle, needle shakes slightly. Idle is noticeably rough. I tried the timing every which way. Heads were done by a reputable shop. Cam is stock, rest of valve train is new Rock Auto parts. Cam came with engine and best i could find out was it was stock for a 383 2 barrel..... No vacuum leaks i can find...
Intake manifold gasket?
It has one very noisy lifter on start up. Any Thoughts

 

[beanhead]

13 inches of vacuum at idle, needle shakes slightly. Idle is noticeably rough. I tried the timing every which way. Heads were done by a reputable shop. Cam is stock, rest of valve train is new Rock Auto parts. Cam came with engine and best i could find out was it was stock for a 383 2 barrel..... No vacuum leaks i can find...
Intake manifold gasket?
It has one very noisy lifter on start up. Any Thoughts

'Stock for a 383' should definitely be more, sounds like a compression test is in order. That should point you in the right direction before you take stuff apart. My money's on a vacuum leak under the valley pan. Especially if your shop milled the heads a little. Hopefully not a valve/cam/lifter problem...

 

[kiwigtx]

I assume that your valve train and heads are all torqued down correctly ?

 

[eric383]

Any specs on the cam? How do you know it's a stock cam?

 

[steve from staten island]

Any specs on the cam? How do you know it's a stock cam?

I got the numbers off it

 

[steve from staten island]

I assume that your valve train and heads are all torqued down correctly ?

Yes but will check again

 

[Bicylindrico]

'Stock for a 383' should definitely be more, sounds like a compression test is in order. That should point you in the right direction before you take stuff apart. My money's on a vacuum leak under the valley pan. Especially if your shop milled the heads a little. Hopefully not a valve/cam/lifter problem...

Maybe a compression test and infrared thermometer at each exhaust runner

 

[steve from staten island]

'Stock for a 383' should definitely be more, sounds like a compression test is in order. That should point you in the right direction before you take stuff apart. My money's on a vacuum leak under the valley pan. Especially if your shop milled the heads a little. Hopefully not a valve/cam/lifter problem...

Might have resurfaced heads. Im leaning in your direction

 

[steve from staten island]

Did a compression check awhile back. Nothing looked bad

 

[POMONAMISSEL]

check cam timing

 

[kiwigtx]

Yes but will check again

I said that because my friend checked the valve-train in his truck a couple of weeks ago, and now it goes a whole lot better.

 

[69L48Z27]

.

 

[eric383]

What kind of numbers on the compression test?

 

[eric383]

I got the numbers off it

What are the numbers?

 

[coronet68mx]

I assume that your valve train and heads are all torqued down correctly ?

Being that the case I may assume a compression leak, I agree with all the post before, run a compression test. And keep us informed on the test

 

[eric383]

Did a compression check awhile back. Nothing looked bad

Did you record the numbers? If so can you post them?

 

[coronet68mx]

Did your engine overheat or why did you rebuild the heads and change the cam ? Heads redone, valve train new, new stock cam, I assume new head gaskets and all new for tuning the engine; you post before a brake problem , don't you have a vacuum leak at the brake booster maybe? Does the pedal brake sound like a cat when you step in it , just a thought

 

[Don Frelier]

You could try and pull a plug wire off each cylinder and replace while it's running. But insulate yourself from the car as much as possible.
Could be one or two cylinders not firing.
New plugs I assume? ( I had an Autolite plug that was bad right out the box a few years back)
The rest of the ignition system is good?
Can you hear a miss in the exhaust?

 

[coronet68mx]

You could try and pull a plug wire off each cylinder and replace while it's running. But insulate yourself from the car as much as possible.
Could be one or two cylinders not firing.
New plugs I assume? ( I had an Autolite plug that was bad right out the box a few years back)
The rest of the ignition system is good?
Can you hear a miss in the exhaust?

I once did that

 

[steve from staten island]

Did you record the numbers? If so can you post them?

Eric i dont think i have numbers but will look