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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Nov 2009 Posts: 78 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2009 Posts: 78 | Okay, my head is going to explode. I've been reading stuff here and all over the web about hooking up a PCV on a 235, and I am confused. I'm tired of the oil drips from the draft tube, so it's something I want to do. Here's my problem - I just bought a new brake booster. Even when I've seen this asked, the answers go all over, but can I use the same manifold vacuum port for both the PCV and booster? I'm hoping for some fresh eyes on the question to maybe get a more definitive answer, or a good option if the answer is no. Thanks in advance.
1959 Chevy 3/4-ton (pics posted soon)
I child-proofed my house, but my kids keep finding their way back in.
| | | | | Joined: Apr 2005 Posts: 2,066 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,066 | Since the 235 engines only have one vacuum port you are really limited on options. You should be able to use a 'T' fitting and operate both. I had the disc brake/booster combination on my 56 along with a PCV before I converted to a V-8. It worked fine.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
A GM PCV system was available on engines from 1948 onwards.
Also, older trucks (than 1956 or 1959) with PCV system also might have had vacuum-actuated 2-speed rear ends and hydrovac brakes (and maybe even other vacuum-supported devices).
| | | | | Joined: Nov 2009 Posts: 78 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2009 Posts: 78 | Thanks guys. Looks like it's off to the FLAPS for some more vacuum line.
1959 Chevy 3/4-ton (pics posted soon)
I child-proofed my house, but my kids keep finding their way back in.
| | | | | Joined: Nov 2009 Posts: 78 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2009 Posts: 78 | No go :-(
I need to replace my broken vacuum gauge so I can check how much I have, but with the PCV hooked up, the braking power goes to crap. It still stops, but it's no better than the stock. The booster feels like it's not working at all.
1959 Chevy 3/4-ton (pics posted soon)
I child-proofed my house, but my kids keep finding their way back in.
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