Thread: Vacuum Line Help

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Can I use 3/8 nipple back carb [tee-off] for power brakes and transmission. The other vaccum port sits under carb. Can I eliminate pcv valve and use breather in valve covers. Other problem ran into sender for water temperature under goose neck on other side is under fuel line. Just trying mock things up before drop in.

Cookster

I would try to keep the transmission line on a seperate tap. Variation of the vacuum signal by the booster to the modualator might cause shifting problems.

There is a "low profile" elbow available that might clear that fuel bowl. I'll see if I can look it up.

As for the PCV, I'm with Denny.

Mike

Here's the low profile fitting.

Edelbrock 8096 - Edelbrock Low-Profile Vacuum Fitting Reducers - summitracing.com

Front view of sender problem. Thanks site.

Thanks for site on low profile elbow. Sorry about typing err.

First, is the manifold square bore or spread bore? Regardless, I'd run a spacer under the carb to gain access to the vacuum fitting.
The pcv should connect to the fitting out of the back of the carb along with a fitting from the breather to the air cleaner.
To use the angle of water gooseneck that you have you'll have to drill and tap the boss in the manifold on the other side or relocate to the head.

Cookster

Can you move the sender to the other side of the manifold? If not, you could put it in the head where the stock senders were. I like them in the manifold better though.

Looks like there is a cast in boss just to the left of the thermostat housing. I'll have to check the Edelbrock manifold I have in the shop, but you may be able to drill and tap that boss for a sender.

I'm not that up on Holley carbs, so I'll leave the PCV questions to those that are. I would try hard to retain the PCV though.

I'll get back to you later.

Mike

This is the boss I was talking about. Your manifold appears to be identical to this one except that this hole is not drilled. You can easily reach under that boss through the thermostat hole to see if the area is open to the water passage. If it is, it should be simple to drill and tap it for your sender.

my edelbrock has a sensor mounted in the flat, just below your finger.

On his casting it is quite pronounced. I expect he could mount it in either position. Just drill and tap for a NPT thread, I presume.

A good freind of mine ( when I was just a lad ) told me that the PCV was the only emissions equipment worth having; the best thing the engineers had turned out.

For vacuum sources, Ford on their 289/302's used a somewhat ugly fitting that had ports for power brakes as well as for the trans. But it works very good. They mounted in the back so they don't show much.

The spacer suggestion will provide the room you need. You can get up to 2 inch spacers, maybe more