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FBIRD69's 1969 Firebird

2024 March
of the Month

Brentco

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  • Location
    SoCal
  • Interests
    Trans Ams

Forever Pontiac

  • Name
    Brent
  • Gender
    Male
  • Year
    1976
  • Car
    Trans Am
  • Engine
    455/468
  • Style
    Coupe
  • Color
    Buccaneer Red

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  1. Bueno — my car didn’t have any of the vent hose set up when I originally got it so I didn’t even know it was supposed to.
  2. That looks nice and clean. The Edelbrock’s big pcv port on the front allows a good direct route. I have vacuum port envy. Do you have the little breather doohickey that mounts in the air cleaner and holds a filter element for the valve cover vent tube?
  3. Thanks, it works great. The final set up ended up being: - passenger side vc: fabbed baffle; modified breather with 5/8 hose to air cleaner - driver side vc: plugged breather (oil filler) - valley pan: pcv valve to 1/2” nicopp running under the manifold to rear port of carb I started with standard aftermarket breathers in both vc’s (and pcv in valley). But I was sucking oil through the pcv and blowing out my dipstick on hard runs. You would think the standard open-vent breathers with foam filters inside would allow enough air, but I guess not. Changed to my current set up and no more oil in intake and dipstick stays put. I put in a catch can to monitor the oil suckage, but I’ll probably take it out because there’s little to no oil ending up in the can.
  4. Ha, definitely not more efficient. You’re (smartly) doing most everything, engine, suspension, brakes, etc, at once while it’s completely torn down. I’ve had 17 years with the car to muddle through everything else, so mine was just a straight engine build (and painting the engine compartment, which was actually a lot of work). I keep forgetting about the donut meet up — need to make it over there. A glamour shot before dropping her in, and one more final installed.
  5. There were a lot of variations of the pcv set up, even within the same model year depending on whether it was a California car or not. Unless you’re going for originality the only important thing is to set up a system that functions well. That is the ideal set up. Ideally, you want the pcv vacuum source to be evenly distributed among the runners, or as evenly distributed as possible. Both to spread around the vacuum leak but also to spread around the crankcase waste product (including any oil sucked through) so it’s burned by all cylinders. For the stockish/cruiser engine you’re building, the factory pcv routing to one intake runner would probably be fine. But if you want to move it, you have a few options. Aren’t you going to run an Edelbrock? The Edelbrock will have a large vac port designed for pcv. If not, you can get an aluminum carb spacer with a central vac port. If you don’t care about keeping the intake original you could also just drill a hole in the intake and add a port to a more central location that will draw to more runners. You are going to need a hose from the valve cover to the air cleaner. For most of the years the hose ran to a nipple in the side of the air cleaner assembly and there was a foam/sponge strip in a bracket inside the air cleaner housing that acted as a filter. You can reproduce that set up, or you can run the hose to a nipple inside the air cleaner filter itself, so it’s only breathing filtered air and you don’t need an extra sponge piece. Then you plug the hole in the other valve cover. This is the best functional set up. It creates a push pull system that freely evacuates the crankcase vapors under all engine conditions. You’ll need some baffling system in the breathing valve cover. If you have the original oil drippers and/or baffles in the valve covers, those should work. Or get baffled vcs or add your own baffle. The important thing is to make sure neither your pcv nor your breather is sucking tangible amounts of oil into the engine. That is very bad. I assume you’re using the factory valley pan which has a very good baffle for that part of the system. Btw, it’s been a while since we were last in touch. I finished my engine build about six months ago, so if you ever want to borrow any tools, including those ridiculously specific engine building tools that you can use only to perform a single task, just let me know. I also have a variety of leftover parts I didn’t end up using, like extra crank keys, block/head plugs, gaskets, studs, fasteners, and a whole grab bag of other random stuff. Shoot me a message if you need anything as you complete your build. You’re right up the street from me, iirc, and I might have just what you’re looking for.
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