Script valve cover conversion, again!
Thread Starter
Administrator
Joined: Jul 2000
Posts: 53,976
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From: About 1100 miles from where I call home.
Script valve cover conversion, again!
A semi-regular topic on this forum has been people interested in switching engines with later (PCV/breather) motors that they have installed in vintage Vettes to using the old script Corvette valve covers, 'cause, uh, they look good.
My NOM '58 has a later motor that Ive been trying to get the vintage look on, and I've had a lot of interest in previous/archived threads on this subject. People who have done this in the past have been helpful and have supplied pics of their cars. Thanks, folks.
Here's mine with the valve covers added. 2 pics without the air cleaner show the PCV valve installed behind the carb on an Edlebrock manifold, and plumbed to the back of the carb. My genius mechanic buddy welded a baffle underneath to cut down on oil splash. The oil fill tube was also installed to the front.
Looks OK for a '69 Corvette 350. So far, so good.
My NOM '58 has a later motor that Ive been trying to get the vintage look on, and I've had a lot of interest in previous/archived threads on this subject. People who have done this in the past have been helpful and have supplied pics of their cars. Thanks, folks.
Here's mine with the valve covers added. 2 pics without the air cleaner show the PCV valve installed behind the carb on an Edlebrock manifold, and plumbed to the back of the carb. My genius mechanic buddy welded a baffle underneath to cut down on oil splash. The oil fill tube was also installed to the front.
Looks OK for a '69 Corvette 350. So far, so good.
Instructor
Joined: Dec 2000
Posts: 187
Likes: 0
From: Edgerton Ohio
Very nicely done. I have seen the common valve cover pcv baffles for sale at some of the speed parts houses seprately from the valve covers. One of those could also be attached under the intake to shield the pcv from oil.
Tom
Tom
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Vettebuyer
I'm confused and just trying to learn and understand more perhaps you can help explain.
I thought the PCV system was suppose to allow ventilation from the crankshaft area and therefore basically needed both an air IN and an air OUT part of the system.
I know on my '65 there is both the tube that runs from the back of the block up to the aircleaner assembly for airflow, plus there is the rubber hose that runs from the oil fill tube in the front of the intake to a fitting on the carb. Both the rear vent and the oil tube vent work together for both air IN and OUT for the system.
On your car you showed the ventilation from the PCV valve in the intake to the base of the carb but I didn't see any other plumbing for the other half of a system. Am I missing something basic?
I'm confused and just trying to learn and understand more perhaps you can help explain.
I thought the PCV system was suppose to allow ventilation from the crankshaft area and therefore basically needed both an air IN and an air OUT part of the system.
I know on my '65 there is both the tube that runs from the back of the block up to the aircleaner assembly for airflow, plus there is the rubber hose that runs from the oil fill tube in the front of the intake to a fitting on the carb. Both the rear vent and the oil tube vent work together for both air IN and OUT for the system.
On your car you showed the ventilation from the PCV valve in the intake to the base of the carb but I didn't see any other plumbing for the other half of a system. Am I missing something basic?
Team Owner
Joined: Mar 2002
Posts: 44,636
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From: Huntsville AL
Originally Posted by BarryK
I know on my '65 there is both the tube that runs from the back of the block up to the aircleaner assembly for airflow, plus there is the rubber hose that runs from the oil fill tube in the front of the intake to a fitting on the carb. Both the rear vent and the oil tube vent work together for both air IN and OUT for the system.
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Originally Posted by Mr D.
Barry, does the fitting on your 2818 carb provide vacuum?
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Originally Posted by vettes1st
BarryK,
You missed the oil fill tube, which is vented.
Wayne
You missed the oil fill tube, which is vented.
Wayne
I did think about that but wasn't sure if that was the case or not.
I suppose that if the oil fill tube has a vented cap that would provide the other half of the system.
thanks.
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Team Owner
Joined: Mar 2002
Posts: 44,636
Likes: 1,827
From: Huntsville AL
Originally Posted by BarryK
I don't know. On the '65's there was no real PCV valve and the fitting which is a 90* brass fitting with a very small oriface in it and the hose goes to the oil fill tube but I don't know if that connection on the carb provides an actual vacuum.
I guess I can toss the 2818 Carb in the ****can.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,923
From: Washington Michigan
Originally Posted by Mr D.
I guess there is no way to use the 2818 Carb on a 350 engine. Even if I drill a hole in the intake you have to have a vacuum sorce for the PVC valve.
I guess I can toss the 2818 Carb in the ****can.
I guess I can toss the 2818 Carb in the ****can.
