Update, i got the secondaries to open up now and its freaking awesome. When my dad drove it he was so surprised and happy, he loved that deep rore of the secondaries. However i think she is not getting enough fuel once they open up. Since the carb was off a 350 chevy, i am going to upgrade the primary and secondary metering rods and jets. Also sometimes the tranny has a little trouble shifting to the next gear when in drive. Question, does the tranny thats in the 70 delta have any vacuum lines that control the shifting?

 

Fantastic, so what was hanging them up? The vacuum modulator on the passenger side just above the pan rail controls shifting at WOT. It requires direct manifold vacuum from the intake. Anyone of those ports directly in the manifold runners would be fine. Mine uses an 1/8 steel line from manifold to trans with vacuum line on each end to connect to the fittings, nothing fancy.

 

The air valve spring tension was too high, i have it set at 1/2 a turn. What do you mean by the pan rail and WOT?

 

I mean the mounting surface on the transmission that the transmission oil pan mounts to. You'll see a canister with a vacuum nipple coming off it. It's held in with a bracket and a bolt. The question is, is it connected to manifold vacuum with hard line and no leaks present?
WOT = Wide Open Throttle

George

 

ohh ok, i don't know if its hard line and or if its leaking. Its 104 outside so i kinda want to wait till it gets cooler to start working on the car.

 

Thanks Bill, btw where can i find these parts. I can't seem to find AU secondary rods and p.p spring.

 

www.carburetion.com
www.cliffshighperformance.com

or

check with your local dealer for the following part numbers:

secondary metering rods(come in a bag of 2, but the price is for each rod)
AU 7033655, acceptable substitutes, CK 7045781, CV (pretty darn close) 7045984

power piston spring 7037734(come in a bag of 10, but most dealers will sell them individually)

dealer list prices:
AU $24.02ea. found on locator
CK not available
CV $25.53ea. found on locator
7037734 $17.91 found on locator

or, make a trip to the boneyard for everything but the p.p. spring

or, someone on the many olds sites may be able to help you out.

last resort, i have AU rods, 7037734 p.p. spring, 49B pri. rods, and 70 jets, all brand new, some NOS, and prices will reflect this.


bill

 

Thanks Bill, im kinda on a budget right now so i'll try my luck at the junkyards and craigslist first. I also have a question for you and everyone else. On the second pic i took which is on the first page of this thread, i noticed this rectangular opening in the back of the carb with a hole in it. I looked up in my Doug Roe book and it says it is a HIC. It also shows a cap over it which i am sure i do not have. What is this HIC and is this important for the operation of the carb?

 

Bill, where can i find the parts for this HIC setup? I don't have any of it. My dads car does have a/c but we disconnected the pulley bec it doesn't work at the moment. Also will this open HIC affect carb performance? I noticed when tuning the carb, the idle mixture screws on the primaries are like 4-5 turns out. I also noticed as the car sits for a while, like at a stop light or something, she starts to sputter and bog a little when trying to accelerate.

 

if your HIC cavity is drilled to be functional, you would have a major vacuum leak there. try spraying carb. cleaner into the HIC cavity, if your engine speed changes dramatically , then we can discuss what to do. if the engine speed doesn't change, then you have no need to worry about it.

until you have the proper application-specific calibrations done, it will run poorly.


bill