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914World.com _ 914World Garage _ Are only 2.0 heads vented

Posted by: Bill Smith Aug 25 2007, 09:41 PM

I have a 1.7 and a 1.8 engine - one of these have vented heads with the little pipe coming off by the spark plug hole - I had been told that only 2.0 heads have the vent - Is this correct

thanks, Bill

Posted by: Headrage Aug 25 2007, 09:51 PM

From what I have been told and even experienced, the 2 liter heads are not all vented from the factory.

I had a '75 2.0 that had to be modified for the head venting.

Posted by: So.Cal.914 Aug 26 2007, 08:19 AM

No, it is not just the 2.0's. I have 72 1.7 heads that are vented.

Posted by: computers4kids Aug 26 2007, 08:45 AM

All of my 75 and 76 2.0S have had only one head vented. I have two 75 1.8s that have one head vented...both the 2.0S and 1.8S, in my case, are venting the passenger head.

Posted by: JPB Aug 26 2007, 08:57 AM

With a CB Performance breather box, you can plumb the valve covers and the breather stack all in one kit and get the same effect. The heads that were vented with the car I got from you are a PITA to put a rubber line and a hose clamp on due to access at the carb intakes. A well done job on the valve covers would be my pick since I did it on a friend's car and they don't leak and are holding well.

Posted by: BMXerror Aug 26 2007, 12:20 PM

Could someone fill in a clueless guy as to what this is for?
Mark D.

Posted by: JPB Aug 26 2007, 01:19 PM

Venting the engine helps in releaving crank case preasure from high revs and high volume oil pumps. Bill had four hoses used on this one, all I did was add an after market breather box. The oil filler box has a case preasure vent on it for this purpose but many engines do not have head vent tubes. When using an after market high volume oil pump, Jake Rabi suggests having head vents because an oil tight engine can become an oil leaking one.

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Posted by: Brando Aug 26 2007, 01:53 PM

Choose your venting location wisely. If you vent to your engine bay and still have the stock heating setup, you'll get oil stench inside the car when driving. Vent to a wheel well or under the engine tin...

Posted by: JPB Aug 26 2007, 02:11 PM

Interesting point and well noted. Here I though my oil smell came from the fogging effect of the oil burning on my exhaust but when all that is fixed, I will see if it still smells like it does.