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I am so needy lately...
Now that I have my 70 455 ready to install back in the 442 I need to deal with vacuum layout. Previous owner removed everything but a single line to the distributor so I am starting from scratch!
Car is an OAI automatic AC power brake car. I have 2 small and 1 large threaded hole in the intake behind the carb. I have 3 small holes in the intake in front of carb. I have a box with 2 thermo vacuum switch (different types, 1 is metal with a canister on top and elect plug, the other has 3 ports and no elect plug. I have a handful of threaded tees and all look different (1 has VERY small holes). I have seen conflicting diagrams. Id love to see a top shot of a correct layout on a running car.
The tall thermal vacuum switch on the right is a 1971-72 part and not correct for a 1970 Olds. The plastic TVS at top center is an aftermarket replacement part from a later Oldsmobile and may or may not work in place of the one shown in the first drawing I posted above. The right angle hose barb fitting to the left of that one is generic and used in multiple locations depending on accessories, as the last drawing I posted shows.
The brass elbow with the female inverted flare threads is for power brake feed.
The hose for the O.A.I. adapter tees into the hose to the air cleaner thermal actuator.
The silver fitting and straight fittings are not used on a 1970. The functions of the vacuum nipples is labeled here.
The tall thermal vacuum switch on the right is a 1971-72 part and not correct for a 1970 Olds. The plastic TVS at top center is an aftermarket replacement part from a later Oldsmobile and may or may not work in place of the one shown in the first drawing I posted above. The right angle hose barb fitting to the left of that one is generic and used in multiple locations depending on accessories, as the last drawing I posted shows.
The brass elbow with the female inverted flare threads is for power brake feed.
The hose for the O.A.I. adapter tees into the hose to the air cleaner thermal actuator.
The silver fitting and straight fittings are not used on a 1970. The functions of the vacuum nipples is labeled here.
Paul,
One of the great things about Olds is they were well engineered for reliability in those days in the face of increasing environmental standards and a host of other challenges.
The factory diagrams you see above tell the tale. Follow that and you'll be happy with how the car performs, at least as the factory intended in 1970. You may choose to diverge from the 1970 factory approach, but it's the perfect place to start so you have a baseline to compare your modifications (if any) against.
Between Joe P & Vintage Chief, you can't get better advice as to how to set up your car for long term reliability. You'll never go wrong following their advice.
I'm no purist on my '66's. I've tweaked them with disk brake, HEI + 10SI alternators for reliability, but factory stock for your year/model is probably the best starting point.
