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Old 10-16-2019, 09:20 PM   #1
LD-Ordie
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Default 292 vacuum leak

So after 6000 miles or so on a new complete rebuild, I noticed something change with the low idle. It's a mild built 292 with a Edelbrock tri-power & Holley 94's. All fresh. Anytime I have any kind of carb issue, I remove the secondaries, block everything off and focus on the center carb. After verifying the carbs or good, i hooked up a smoke machine and found the far left port leaking, but also a fair amount coming from the front area of the lifter valley pan. So, it seems odd to have a gasket fail like this on the intake when all is tight, but the smoke coming from the lifter valley has me confused. could I be having a major issue here? Any advice will be appreciated!!
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Old 10-17-2019, 01:23 AM   #2
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Default Re: 292 vacuum leak

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... i hooked up a smoke machine and found the far left port leaking, but also a fair amount coming from the front area of the lifter valley pan

Are you describing an intake runner port or carb port?

From the lifter valley itself or just the general area?
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Old 10-17-2019, 08:16 AM   #3
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Default Re: 292 vacuum leak

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Originally Posted by KULTULZ View Post
Are you describing an intake runner port or carb port?

From the lifter valley itself or just the general area?
It appeared to me that it is coming from around the far left port against the head and from the gasket area of the front of the lifter valley pan. But this area never leaked any oil before, so it could be deceiving. My smoke machine has 2 pump settings, this is on low, when it is on the normal settings, it will put out so much smoke from the whole intake area, that it will fill the engine compartment. Is there some sort of way a vacuum leak could be in the lifter valley area? Engine ran fine say above 1500 RPM. Only at an idle I noticed something off
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Old 10-17-2019, 08:30 AM   #4
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Post Re: 292 vacuum leak

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Is there some sort of way a vacuum leak could be in the lifter valley area? Engine ran fine say above 1500 RPM. Only at an idle I noticed something off

If the valley pan gasket is leaking or warped whereas it won't seal, it will cause a vacuum leak with an operational PCV System (causing a lean condition), road draft to a lessor degree. If the seal is bad, the smoke machine will show it.

As for the intake runner(s) leak, what does a vacuum gauge show while idling?

How are you introducing the smoke into the engine?

Interesting.
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Old 10-17-2019, 08:31 AM   #5
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Default Re: 292 vacuum leak

Do you a PCV set up?
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Old 10-17-2019, 08:51 AM   #6
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Default Re: 292 vacuum leak

So no PCV system, only the road draft. Have not installed a vacuum gauge yet. Definitely running lean by pulling all the plugs. They do seem equally the same white. Getting back on it today. Does anyone make a better lifter pan? Thanks for the input!!
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Old 10-17-2019, 08:57 AM   #7
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Default Re: 292 vacuum leak

OK, found the cast aluminum valley pan from John Mummert. Is his stuff worth while? Any opinions on buying the one with a rear breather or not?
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Old 10-17-2019, 09:03 AM   #8
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Post Re: 292 vacuum leak

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Originally Posted by LD-Ordie View Post

So no PCV system, only the road draft. Have not installed a vacuum gauge yet. Definitely running lean by pulling all the plugs. They do seem equally the same white. Getting back on it today. Does anyone make a better lifter pan?

Thanks for the input!!
If you are introducing the smoke via the intake manifold and see leakage at the 5/6 runner(s), your main problem is there. Once you have established with a vacuum gauge a vacuum leak, concentrate on those runners. OEM intake?

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OK, found the cast aluminum valley pan from John Mummert. Is his stuff worth while? Any opinions on buying the one with a rear breather or not?
MUMMERTS pieces are first class (IMO). You need a rear breather option if you are planning PCV. If you decide to retain the road draft, it is not needed.
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Old 10-17-2019, 09:06 AM   #9
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Red face Re: 292 vacuum leak

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OEM intake?

... duh ...


I see EDEL now.
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Old 10-17-2019, 09:15 AM   #10
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Default Re: 292 vacuum leak

Thank you much Kultulz! I'm fine with the old road draft, so will order a pan this morning. I guess no real need to continue with trouble shooting with a vacuum gauge, intake is definitely leaking, so it's coming off and will go back together when the new pan gets in. So I'm spoiled with working on early small block chevy's, I'm not seeing a lot of options with gaskets. Any preferred brands out there? Thanks again!
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Old 10-17-2019, 09:39 AM   #11
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Default Re: 292 vacuum leak

Y block gaskets for the intake can be put on wrong. At first they look the same. Lay each one on the head to make sure they are on the correct side before the intake goes on. I like to use the studs to hold them. Make sure everything is very clean, and tighten the intake evenly. Be sure the bolts are not too long and bottoming.
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Old 10-17-2019, 09:46 AM   #12
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Default Re: 292 vacuum leak

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Originally Posted by Ole Don View Post
Y block gaskets for the intake can be put on wrong. At first they look the same. Lay each one on the head to make sure they are on the correct side before the intake goes on. I like to use the studs to hold them. Make sure everything is very clean, and tighten the intake evenly. Be sure the bolts are not too long and bottoming.
Will do, thank you much!!
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Old 10-17-2019, 10:45 AM   #13
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Post Re: 292 vacuum leak

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Originally Posted by LD-Ordie View Post

Any preferred brands out there?
GOOGLE - BEST GASKETS

What model is your EDEL? Which cyl heads are you using?

Make sure the intake is not warped and the hear surface is straight.
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Old 10-17-2019, 11:00 AM   #14
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Default Re: 292 vacuum leak

the engine was built by Tim the Y-Block guy. Here is the link to the You Tube page showing the run-in and engine details. All from the previous owner. He's supposed to have a very good reputation. The main thing I changed was turning the secondary carbs to sealed dumpers using the kit from Charley Price. I really think it's a better way to go. I will be double checking the intake while it's off!!

https://www.youtube.com/watch?v=IsdF7vi6Jng

Engine details from his page

292 Y-Block Ford V8 +.040 270* cam with ported C1TE heads with 1.85" intake valves. Factory re-finished 573 Edelbrock intake with three "New" Edelbrock/Holley 94 carbs. Will be installed into a 1955 "Courier" sedan delivery.
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Old 10-17-2019, 11:14 AM   #15
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Thumbs up Re: 292 vacuum leak

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He's supposed to have a very good reputation
It doesn't get much better than that.

You will need the 57/ Intake Set. I agree on the end dumpers.

What made you to decide to go thru a SBC Exorcism?

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Old 10-17-2019, 11:26 AM   #16
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Default Re: 292 vacuum leak

You will need the 57/ Intake Set. I agree on the end dumpers.

What made you to decide to go thru a SBC Exorcism?

What do you mean by the 57/ intake set? As in gaskets?

So I also like old chevy's I own a 55 3100 big window with a 327, 5spd Tremec with 3 2G carbs. Wife drives a 52 Style line deluxe with the original 235 3 on the tree. They are all fun!!
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Old 10-17-2019, 04:10 PM   #17
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Post Re: 292 vacuum leak

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What do you mean by the 57/ intake set? As in gaskets?
Yes. There are basically three different size intake ports over the years so you need to know how they progressed in size to select the correct intake set.

I do appreciate all car makes and the SBC was the most competitive on the street. Besides, some of my best friends drive a STOVEBOLT ...

Just kidding ...


OH! Charlie is correct on L and R so be careful.
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Old 10-17-2019, 08:12 PM   #18
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Default Re: 292 vacuum leak

I have Mummerts valley pan on two engine and haven't had any problems. I did find that I had to groove the front where the thermostat housing is on both. A friend had the same problem. Check this area when installing the intake.
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Old 10-17-2019, 10:22 PM   #19
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Default Re: 292 vacuum leak

Quote:
Originally Posted by Ole Don View Post
Y block gaskets for the intake can be put on wrong. At first they look the same. Lay each one on the head to make sure they are on the correct side before the intake goes on. ...
Quote:
Originally Posted by paul2748 View Post
I have Mummerts valley pan on two engine and haven't had any problems. I did find that I had to groove the front where the thermostat housing is on both. A friend had the same problem. Check this area when installing the intake.
photo 1. intake gasket on the wrong side
photo 2. different size openings in the intake gaskets
photo 3. valley pan bolt under the thermostat was preventing the intake manif from sitting all the way down onto the heads. Had to shave 1/8 inch off of the rubber grommet. Also notice the groove under the thermostat housing in this oem valley pan that paul2748 had to add to his aftermarket version.
Attached Images
File Type: jpg intake, driver side head.jpg (47.0 KB, 19 views)
File Type: jpg 54 vs 55+ intake gasket size c.jpg (27.7 KB, 19 views)
File Type: jpg valley pan bolt.jpg (64.9 KB, 21 views)

Last edited by dmsfrr; 10-17-2019 at 10:33 PM.
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Old 10-17-2019, 11:15 PM   #20
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Default Re: 292 vacuum leak

This is all great info!!! I sure appreciate the assist!! Parts were ordered thru Mummerts machining, should see them early next week, I'll be paying close attention to the details and will share end results
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