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  #1  
Old 10-28-2019, 02:05 PM
ShagWagon ShagWagon is offline
350 Buick
 
Join Date: Apr 10, 2016
Location: Oregon Coast
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Manifold vacuum?



I had a mechanic do some head work and when I get it back he installed this where my brake booster previously went. It doesnt have any vacuum to it? I thought this port had a lot of pressure. He also didn’t install the metal intake pan gasket, and said it was t necessary. Could that be why there isn’t any vacuum there?

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  #2  
Old 10-28-2019, 03:31 PM
gpcl16 gpcl16 is offline
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Location: California
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Is that an edelbrock intake manifold? Hard to tell without zooming out on the photo to get some context but that looks like it could be the PCV valve? There would be no vacuum coming out of the port, it leads to the crankcase (valley pan). You would want manifold vacuum running to the valve. I would not install an intake without the metal shield. As I understand it, it prevents oil from the lifters/pushrods from splashing up on the underside of the intake and burning up and caking. I installed an edelbrock intake several years back. I had to source a rubber grommet like that and use a different PCV valve (I believe it was from a chevy 350).
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  #3  
Old 10-28-2019, 05:16 PM
ShagWagon ShagWagon is offline
350 Buick
 
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Location: Oregon Coast
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Quote:
Originally Posted by gpcl16
Is that an edelbrock intake manifold? Hard to tell without zooming out on the photo to get some context but that looks like it could be the PCV valve? There would be no vacuum coming out of the port, it leads to the crankcase (valley pan). You would want manifold vacuum running to the valve. I would not install an intake without the metal shield. As I understand it, it prevents oil from the lifters/pushrods from splashing up on the underside of the intake and burning up and caking. I installed an edelbrock intake several years back. I had to source a rubber grommet like that and use a different PCV valve (I believe it was from a chevy 350).

Yes its an edlebrock perormer intake manifold. Yes it has a metal valve in it. And he put a 1/4 hose about 7inches on it. I assumed it was meant to be plugged into my canister system for vacuum. I blocked it off and ran a splitter to my fuel regulator overflow hose connected to the throttle body for vacuum and that seems to work good. Should I unplug the PCV valve and run a hose somewhere? I don’t know what to do with it. I thought it should have a lot of vacuum. I didnt know.

He didn’t install the metal gasket. Said I didn’t need it and he installed a fel pro I think and gave the metal one back to me.
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  #4  
Old 10-30-2019, 09:15 AM
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rang-a-stang rang-a-stang is offline
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Quote:
Originally Posted by ShagWagon
Yes its an edlebrock perormer intake manifold. Yes it has a metal valve in it. And he put a 1/4 hose about 7inches on it. I assumed it was meant to be plugged into my canister system for vacuum. I blocked it off and ran a splitter to my fuel regulator overflow hose connected to the throttle body for vacuum and that seems to work good. Should I unplug the PCV valve and run a hose somewhere? I don’t know what to do with it. I thought it should have a lot of vacuum. I didnt know.

He didn’t install the metal gasket. Said I didn’t need it and he installed a fel pro I think and gave the metal one back to me.
Really?! You may need a new mechanic. You do need that valley pan. The Fel Pro kit is the metal pan and 2 end pieces. You can run without the end peices but you should have the metal pan. I have a feeling he gooped gasket maker in there instead of using the pan. The valley pan does more than just seal the intake to the heads...

That IS definitely your PCV valve but I don't think it is the right one for an 87. As long as that top nipple is connected to manifold vacuum it should work OK as you have it but you will probably want to replace it with an earlier model PCV (they are straight through) unless you have a carbon canister. If you look here at the 84-84 diagram you can see how that type of valve "should" be hooked up.


I also think it is best to have your brake booster connected to it's own, dedicated manifold vacuum nipple (I assume you already have that). Most of your vacuum system should be mostly stock, even with an Edelbrock intake and 4bbl carb. The only reason to change your vacuum system is if you get rid of stuff.
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  #5  
Old 10-31-2019, 07:23 PM
ShagWagon ShagWagon is offline
350 Buick
 
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Location: Oregon Coast
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Quote:
Originally Posted by rang-a-stang
Really?! You may need a new mechanic. You do need that valley pan. The Fel Pro kit is the metal pan and 2 end pieces. You can run without the end peices but you should have the metal pan. I have a feeling he gooped gasket maker in there instead of using the pan. The valley pan does more than just seal the intake to the heads...

That IS definitely your PCV valve but I don't think it is the right one for an 87. As long as that top nipple is connected to manifold vacuum it should work OK as you have it but you will probably want to replace it with an earlier model PCV (they are straight through) unless you have a carbon canister. If you look here at the 84-84 diagram you can see how that type of valve "should" be hooked up.


I also think it is best to have your brake booster connected to it's own, dedicated manifold vacuum nipple (I assume you already have that). Most of your vacuum system should be mostly stock, even with an Edelbrock intake and 4bbl carb. The only reason to change your vacuum system is if you get rid of stuff.

Yes he was a new mechanic I tried. Runs a machine shop too. He gave it back to me and Ive had to do several hours to get all the Spark plug wires re routed away from data lines and insulated. He plugged off my canister system and never ran a line to it so my heater actuator didnt work, or cruise,4wd etc.... Broke the wire to the noise canceller and I had to resolder the wire back on, broke my fuel pressure gauge, left off a spark plug wire and left 2 others not snapped on.. and probably a few other half assed sloppy, no pride in your work stuff at a premium price.

I plugged the brake booster into a port on the fitech.

I think there is maybe a vacuum port on the front of the manifold. ill check tomorrow and run the pcv to it if it sucks and thats where it supposed to go.

Thanks
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  #6  
Old 11-02-2019, 02:31 PM
Ristow Ristow is offline
 
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he used fiber gaskets instead of the pan. you might pull some oil thru the PVC without the pan,you may not.



there is a baffle that comes off the stock intake and gets put on the new intake,that one you really do need.


i prefer the pan but the gaskets work fine too.
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  #7  
Old 11-07-2019, 07:52 PM
ShagWagon ShagWagon is offline
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Location: Oregon Coast
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Quote:
Originally Posted by Ristow
he used fiber gaskets instead of the pan. you might pull some oil thru the PVC without the pan,you may not.



there is a baffle that comes off the stock intake and gets put on the new intake,that one you really do need.


i prefer the pan but the gaskets work fine too.

Thanks for the wisdom! I was worried I would have to re install it with the pan. I think what I bet happened was he didnt know what to do with the oil modification. I had to take some tin snips and cut it to fit the 6 inch tube when I installed it the first time. Maybe he wasnt feeling so ambitious. I didnt ask. Dont want to ever talk to him again lol.

I ran a hose from the pcv valve to a dual vacuum port on the frontside of the manifold. I was confused because I always thought pcv valves are on valve covers.

I think I got this right. Running good.
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