SBC 350 PCV question
#1
Rocket "Scientist"
Thread Starter
Join Date: Oct 2011
Location: Roanoke "Roa-Joke", Virginia
Posts: 252
SBC 350 PCV question
So I got a second hand Holley 1460 (80508-3) 750CFM, works great, but there is no port for the PCV valve on my engine to pull vacuum, only one for the brakes. It was on a Ford, and I know they pull from the manifold, so I dunno if that matters, but it's otherwise completely fine. Was gonna put this carb on the '79, but I really like the way it runs so the '79 will get the Summit 600.
I tried using a T to make the PCV pull from the same vacuum as the brakes, but my brakes really sucked when I did that, not enough vacuum I guess.
Where else can I hook up the PCV valve? The only ports on the carburetor as follows:
1 ported vacuum for distributor advance
1 manifold for transmission
1 manifold for brake booster
The base plate has a flat spot where there should be another vacuum port, but there is not. I have an adapter under it that adapts it from square to spread bore, I was thinking I could either drill that or put a T on the manifold vacuum source at the heater vacuum port. Any ideas?
Thanks,
-Ben
I tried using a T to make the PCV pull from the same vacuum as the brakes, but my brakes really sucked when I did that, not enough vacuum I guess.
Where else can I hook up the PCV valve? The only ports on the carburetor as follows:
1 ported vacuum for distributor advance
1 manifold for transmission
1 manifold for brake booster
The base plate has a flat spot where there should be another vacuum port, but there is not. I have an adapter under it that adapts it from square to spread bore, I was thinking I could either drill that or put a T on the manifold vacuum source at the heater vacuum port. Any ideas?
Thanks,
-Ben
#2
The PCV is a big vacuum leak, so it needs to connect at the base of the carb and not on an individual cylinder runner. Putting it on a runner would likely cause a lean misfire on that cylinder. Drilling the adapter would be my choice.
#3
Rocket "Scientist"
Thread Starter
Join Date: Oct 2011
Location: Roanoke "Roa-Joke", Virginia
Posts: 252
I wasn't sure if I'd get good vacuum from the adapter or not, but now I know, thanks for the info.
#5
Rocket "Scientist"
Thread Starter
Join Date: Oct 2011
Location: Roanoke "Roa-Joke", Virginia
Posts: 252
Upon reading this I literally had the realization that I may have spent a bit much time spray painting today, even with a good mask it kind of messes with your head.
#6
#7
Rocket "Scientist"
Thread Starter
Join Date: Oct 2011
Location: Roanoke "Roa-Joke", Virginia
Posts: 252
Thread
Thread Starter
Forum
Replies
Last Post
Dead Reckon
Non-Olds Engines
4
December 7th, 2014 02:55 PM