FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#1
|
||||
|
||||
Anyone seen a piped line from the front of a two barrel?
Car is a 68 Firebird It has a 1/8” line coming from the front of the car I assume it gets a line to the air cleaner but I doubt it’s factory what is it?
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#2
|
||||
|
||||
Some of that old stuff, that pipe went to the vacuum advance...
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#3
|
||||
|
||||
You think it’s factory?
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#4
|
||||
|
||||
My 67 Chevrolet Bel Air, 283 2G (the small one) had such a pipe.
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
The Following 2 Users Say Thank You to 77 TRASHCAN For This Useful Post: | ||
#5
|
||||
|
||||
Was that car from CA originally?
That location on the carb is usually where there’s a Ported vacuum nipple, so it’s kinda odd to me that there’s no nipple, but a brass adapter, but who the hell knows?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#6
|
||||
|
||||
I don’t believe it to be a cali car but don’t know
Probably won’t get the phs
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#7
|
||||
|
||||
It looks to me as if it goes into the fuel bowl area. Seems added. Take the top off and have a look.
__________________
" Darksiders Rule "
|
#8
|
||||
|
||||
Quote:
That's someone own rigging.
__________________
Carburetor building & modification services Servicing the Pontiac community over 20 years |
The Following User Says Thank You to shaker455 For This Useful Post: | ||
#9
|
||||
|
||||
I agree. Vacuum advance line that is home-made and oversized.
__________________
Jeff |
The Following User Says Thank You to geeteeohguy For This Useful Post: | ||
#10
|
||||
|
||||
Ok but Why lol thanks guys!
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#11
|
||||
|
||||
FWIW, vacuum modulator source would be my guess, depends on if it's manifold vacuum, or ported. You'd need manifold vacuum for a modulator to operate properly.
As has been said, I have seen hard lines in the mid 50s engines to operate the vacuum advance, but by the late 50s, early 60s the factories had pretty much gone to hose connections. Also on truck applications I have seen hard lines used for distributor vacuum advance, with just a short piece of hose before the advance can so the distributor timing could be set. |
#12
|
||||
|
||||
I guess if it probably was added when the turbo 350 was added it makes sense thanks again
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#13
|
||||
|
||||
I have factory vac line routing diagrams around somewhere, but they may only go back to 1970.
I will dig around later and post if I have them for 68. |
#14
|
||||
|
||||
Really looks like the proper location for a ported advance. Tube was probably originally rotated to bend up then down before going toward the firewall. And if the carb was originally off a Chevy that would be the proper location for the advance diaphragm.
|
#15
|
||||
|
||||
Carb is a 7028071 used on a 1968 Pontiac 350 Firebird/Tempest M/T from factory.
In 1968 GM and others started retarding ignition timing by using a ported source for the vacuum advance to heat up the cylinder heads to reduce NOX emissions and this is what the tube in picture is used for. Someone has twisted the tube but the end of it should point to the distributor. |
#16
|
||||
|
||||
Quote:
You note the carb is correct for M/T. Did they use the same ported vacuum on Auto cars? Just curious.. |
#17
|
||||
|
||||
Yes, but for 1968 and 1969 the valve is the T.V.S. valve next to thermostat housing.
All 1968-69 carbs uses the ported source to control vacuum advance, M/T or A/T. |
#18
|
||||
|
||||
Thanks Kenth, that's interesting.
|
Reply |
|
|