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Classic/Antique Car Repair/Carb. vacuum
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Question
Brad--I am replacing a R2GC carb. on my '58 Pont. with a Carter AFB 4 BBL copy (Edelbrock). The copy a has "Ported/ Timed" port above the throttle plates and a Manifold V. port below. My Roch. now feeds the dist. adv. with a port that is located on frt. rgt. corner part way up the carb. body. Which AFB port should feed the Dist.?
-----------Thanks DLJ
Hopefully you still have the 2 barrel on the car. The easy way to check is to run the engine and check for vacuum at the port. If there is vacuum with the engine idling then the lower port or Manifold V port is the one to use. If the vacuum is not seen at the port until you are above idle then the timed port is the one to use. If the carburetor is already off the car, block the throttle plate open. Use a short section of vacuum hose on the port that was connected to the distributor and blow through it. With your finger inside the car bore see where the air is coming from. If it is above the throttle plates it is timed or ported and below is manifold vacuum.
Brad
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Answers by Expert:
Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience
Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials
More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors
Moto Award winner. And much more.
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