what happens if you dont run breathers - Team Camaro Tech
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post #1 of 19 (permalink) Old Jun 26th, 01, 01:43 AM Thread Starter
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Would it be bad if i used valve covers that didnt have any breather holes?
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post #2 of 19 (permalink) Old Jun 26th, 01, 02:34 AM
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Yep, its not a good idea to run without atleast breathers. Blow by pressure has to go somewhere, if not your breathers, than your gaskets and dipstick.

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post #3 of 19 (permalink) Old Jun 26th, 01, 03:53 AM
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Valve covers without breathers MUST be run with the old style intake, the one with the oil fill tube. The best scenario is to run one breather and one pcv.
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post #4 of 19 (permalink) Old Jun 27th, 01, 05:25 AM
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My all stock 67 has solid valve covers (no breathers) or a pcv valve, but it does have the oil fill tube. Should I modify it somehow for more ventilation?
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post #5 of 19 (permalink) Old Jun 27th, 01, 06:32 AM
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Ken,

Your all stock '67 has a vent tube at the back of the block that connects to the air cleaner as well as the oil fill tube. Look at the base of your carb and you might even have a pcv that you didn't know about...

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post #6 of 19 (permalink) Old Jun 27th, 01, 12:31 PM
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I'll have to check all that. It is a 327/210hp, rochester 2bbl.
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post #7 of 19 (permalink) Old Jun 27th, 01, 03:55 PM
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Also.....early blocks have a breather in the lifer valley....that is why some do not have valve cover breathers.
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post #8 of 19 (permalink) Old Jun 27th, 01, 07:04 PM
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Ken and Dennis, I've also got a stock 327/210 with solid covers and the tube at the back block Dennis refered to has a hose with a 90 degree angle that heads towards the trans and just dangles there. It's not connected to the base of my 2bbl rochester. Hope that helps. It's an early built car.

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post #9 of 19 (permalink) Old Jun 28th, 01, 02:44 AM Thread Starter
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So how can you run aftermarket valve covers with no breather holes?

Im asking because i want to run a set of these. http://www.carboncomponents.com/chbig.html
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post #10 of 19 (permalink) Old Jun 28th, 01, 04:12 AM
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Sure enough! there is a tube running from base of the back of the carb (from the pvc valve I didn't know I had), down under the distributor somewhere. Thanks, guys! I still learn something new every day.
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post #11 of 19 (permalink) Old Jun 28th, 01, 05:38 AM
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Before PCV valves, the in-block crankcase breather was connected to a "road draft tube". This was a metal tube that went from the back of the block down to the bottom of the oil pan where the end of the tube was exposed to air rushing under the car. The tube had an angled cut to help draw crank case vapors out of the block and into the atmosphere. Not very environmentally friendly, but it did the job.

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post #12 of 19 (permalink) Old Jun 28th, 01, 06:10 AM
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jv - what is your combo? what year?

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post #13 of 19 (permalink) Old Jun 28th, 01, 10:32 AM Thread Starter
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Ive got a 68 with a 396, Strip Dom. intake, 850 cfm Holley d.p.,.544 lift cam, and 11.1 pistons. The block is from a 67. I was thinking about installing a set of those carbon fiber valve covers but they have no breather provisions. This is why i asked the question in the first place.
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post #14 of 19 (permalink) Old Jun 28th, 01, 11:01 AM
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I dont know if your '67 should have the same vent at the back of the block like a SBC... You can always drill and put rubber gromets for the breathers...

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post #15 of 19 (permalink) Old Jun 28th, 01, 12:40 PM
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None of the BBs were set up for a road draft tube you must valve cover breathers.

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