PCV Hose Routing
 

Subject vehicle is a 1970 Nova L78 and I want to cut my PCV hose to it's final length. Should the hose be routed in front of the carb, or, behind the carb? Looking at internet examples I see it done both ways. Some examples route it through the engine lift bracket but that looks wrong to me? Is there a consensus of how this hose would have been located from the factory?

Thanks

In front of,but I would cut some slack out of that so that it's touching the brass Tee.

----What Rick said. As well, running the PCV hose behind the carb always looks to me like it could interfere with the throttle linkage. Dont want that!.......Bill S

When Mr70 speaks... I listen!

70 L78 Nova..
 

Since you are asking questions about correct install of engine items...couldn't help but notice your throttle spring placement. The factory install would have been completely different...also I see a vacuum hose connected to a port near the air-horn on the carburetor...can't quite see where it goes, but it looks like it is running to the distributor vacuum advance ?? If so, this will not give you the correct vacuum source for the advance.

Not sure what level of 'correctness' you are after...but, we can post some photos as a reference if you want.

How about posting a few photos of your car...we love pictures :beers:

-wilma

"a vacuum hose connected to a port near the air-horn on the carburetor"

Yes, this is the vacuum advance hose. Thanks to yourself and other Super Car registry users I know I don't have the complete and whole TCS solenoid and set-up, but obtaining these components is not a priority step right now and is on the futures list.

When I installed the 4557 carb, it was different from the pre-existing carb, and since I'm not a mechanic it appeared to need a vacuum hose in that location, so that's where I have it right now. So, if I tee the hose elsewhere I'm assuming that port by the air horn should be stoppered?

If the throttle spring set-up is wrong I would like to address that with a reference and a supplier of the correct spring kit.

Many Thanks

Sweet Nova you have, very nice. Love the rubber floor bench seat look...

70 l78...
 

The photo you show with the throttle spring is helpful...the small one with the bracket is the factory setup...the other larger spring was never part of the equation.

-wilma

Great! I can handle removing a spring.

But, regarding the comment... "I see a vacuum hose connected to a port near the air-horn on the carburetor...can't quite see where it goes, but it looks like it is running to the distributor vacuum advance ?? If so, this will not give you the correct vacuum source for the advance"

It would be helpful if I could get more clarification. In my previous post there was a photo that appeared to show the distributor vacuum ultimately (after the TCS solenoid) connected to that air horn port. For reference here's my older post.

https://www.yenko.net/forum/showthread.php?p=1302936

Anyone else with this carburetor and no TCS solenoid out there?

Thanks

No TCS..
 

You want manifold vacuum to the distributor....just tee into the line by the choke pull off and you will get full vacuum. The factory had these set at 4* btdc...if you have good fuel this can be kicked up. I run a total of 36* all in by 3,000 rpm. You can play around with the initial and then adjust the mechanical weights to get you to the right spot. A dial back lite is handy for this.

**TCS can be installed just for looks and made inop...these motors like a little lead on the crank, especially if you have the other aspects dialed in...carb, fuel, gears, plugs, etc.