Hi from TN, I have a question... - Team Camaro Tech
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post #1 of 11 (permalink) Old May 14th, 10, 03:11 PM Thread Starter
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Terry
 
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Location: TN
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Hi from TN, I have a question...

I have a 67 Camaro with 88 model engine with vortex heads. I have been restoring the past 5 years. I need help with a vacuum leak. The vacuum gauge is showing only 12HG does anyone have any suggestions as why it so low?

Terry
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post #2 of 11 (permalink) Old May 14th, 10, 03:18 PM
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John
 
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Re: Hi from TN, I have a question...

Welcome Terry, If your engine is mostly stock, probally, check intake gaskets, and carb
gaskets. If the metal imprecated intake gaskets were used with an alum intake. they will not seal.
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post #3 of 11 (permalink) Old May 14th, 10, 03:29 PM Thread Starter
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Terry
 
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Re: Hi from TN, I have a question...

I rebuilt the engine 2 years ago. I'm not sure what gaskets I used because it's been two years and it's been in the body shop till recently. Is there any other way I can check for leaks?
Thanks!

Terry
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post #4 of 11 (permalink) Old May 14th, 10, 03:35 PM Thread Starter
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Terry
 
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Re: Hi from TN, I have a question...

I have an aluminum intake but I used the standard gaskets that came with the rebuild kit.
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post #5 of 11 (permalink) Old May 14th, 10, 03:35 PM
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Thumbs up Re: Hi from TN, I have a question...

Welcome to team camaro!!
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post #6 of 11 (permalink) Old May 14th, 10, 03:51 PM
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Brandon
 
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Re: Hi from TN, I have a question...

Welcome to TC.

Try spraying some starter fluid around the carb base and manifold paying attention to the front and rear. If the engine has been adjusted to compensate for the leak, the motor will bog. If it wasn't adjusted for the leak, then the motor should rev up a bit. At which ever spot that one of these two results happends is your trouble spot. Snug up the bolts in the area you find and then retest and/or put the vacuum gauge back on and see what the reading is.

Do you recall the lift of the cam per chance. This could also be the reason for the lower hg your experiencing. A fairly high lift of about .470 is enough to drop the hg to the 10-13 range. If that's the case then there isn't much you can do about it.

Brandon J. licence 1NASTY67

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post #7 of 11 (permalink) Old May 14th, 10, 05:53 PM
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kevin
 
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Re: Hi from TN, I have a question...

timing set low or mechanical advance stuck due to body dust...or possible just needs blown off and idle mixture adjusted..
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post #8 of 11 (permalink) Old May 14th, 10, 06:26 PM Thread Starter
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Terry
 
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Re: Hi from TN, I have a question...

I have an Competition Cam part#12-212-2 series 280H lift.480/.480. The vacuum problem is causing the engine to run very rich. Or that what I believe it to be. I have had two different carbs one a 600 Eldenbrock and just recently a 600 Holley. Both were doing the same thing, burning rich fuel and if I put my hands to exhaust its moist.


Sarter fluid around the carb base and manifold paying attention to the front and rear. If the engine has been adjusted to compensate for the leak, the motor will bog. If it wasn't adjusted for the leak, then the motor should rev up a bit. At which ever spot that one of these two results happends is your trouble spot. Snug up the bolts in the area you find and then retest and/or put the vacuum gauge back on and see what the reading is.

Do you recall the lift of the cam per chance. This could also be the reason for the lower hg your experiencing. A fairly high lift of about .470 is enough to drop the hg to the 10-13 range. If that's the case then there isn't much you can do about it.[/QUOTE]

Terry
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post #9 of 11 (permalink) Old May 14th, 10, 06:58 PM
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Brandon
 
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Re: Hi from TN, I have a question...

For the lift of the cam, that's about right. I have the .470 lift with 1.6 rockers so it's reading at .501 lift. .The vacuum reading is at 10hg with a best of 11hg.

Depending on the size of the motor though, a 600 would be a bit small. I would still look to thinning out the mix.

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post #10 of 11 (permalink) Old May 14th, 10, 07:22 PM Thread Starter
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Terry
 
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Re: Hi from TN, I have a question...

Quote:
Originally Posted by Nantooch View Post
For the lift of the cam, that's about right. I have the .470 lift with 1.6 rockers so it's reading at .501 lift. .The vacuum reading is at 10hg with a best of 11hg.

Depending on the size of the motor though, a 600 would be a bit small. I would still look to thinning out the mix.
Its a 350, bored 40 over, cam 480/480, headers, edenblock intake. One thing I messed up was the heads. Its has stock heads, stock valve and springs.

Terry
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post #11 of 11 (permalink) Old May 15th, 10, 05:54 AM
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Brandon
 
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Re: Hi from TN, I have a question...

I'd say your definately undercarbed. I'm running a 327 .40 over with the .470 .470 and it takes at least a 670 to be happy and runs better with a 750.

Vortex heads should breath better than the fuelies I'm using..

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