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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2004 Posts: 241 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 241 | Hello. I have a closed PCV system on my truck. I am never sure about which PCV valve to use on my 1956 235. I am currently using a Purolator PV679. The pintle inside of it has an "A" stamped on it. Do the letters have anything to do with the size of the spring tension or hole in the end of the PCV valve? Is the letter that's stamped on it indicative of the engine vacuum and engine size? I've also seen an "F" stamped on these too.
Does anyone know which one would be the best for my 235 that gets around 18" to 20" of idle vacuum when tuned? Should I also be concerned with the lettering on the inside of the PCV pintle?
Thank you. Mark
| | | | | Joined: Sep 2007 Posts: 393 'Bolter | | 'Bolter Joined: Sep 2007 Posts: 393 | Check out this PCV how to by Deve. He tested a few valves to get the right one for his system on a 235.
It's a small world, but I wouldn't want to paint it.
| | | | | Joined: Sep 2004 Posts: 241 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 241 | | | |
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