hi folks

need a bit of help please     what is the lever with the horizontal screw for?

also there is a threaded port to one side and below the fuel inlet that leads to a pin sized hole just below one of the primary throttle blades is this the vacuum signal for the distributor? would that be ported or otherwise?

many thanks for any help

stuey

England

there is no id tag   its a 1.12  c5af-h   i think it comes from a later car but it is what was fitted when i got the truck

i must admit i was a bit disapointed when Teds carb test showed the 1.08 performed better. as the best performer was a 750 holley i would have thought the 1.12 would have done better...but i'll stick with what i've got.

does any one know the correct fitting for the vacuum port and where they can be obtained? a 3/16 flare nut fits but theres no 45* seat in there

stuey  

     See if maybe it's a plain old tapered pipe, although it ought to be a tubing (with a flaired seat.) 

it takes a 3/16 tube nut (3/8-24) but it does not have a tapered seat. the nut stops and the 3/16 tube carries on for about another 1/8". i've been staring down the hole (the peepers are getting a bit dim these days) and i think the tube needs an "olive" if there is such a thing  for 3/16 tube

there is such a thing! in fact there are two sorts "parallel and barrel" about £9 per 100.

Mike i'd gladly let you know but don't hold your breath. this project has been running for 6 years to date. i do a bit when funds permit. champagne tastes on beer money springs to mind. the fact that i've got this far is the result of the help and enthusiasm i've received from everyone on this site.i nearly dumped that weired looking motor with the across the front exhaust but after reading some articles by one Jerry"Yestertech" Christenson i got curious. he certainly recomends the 4100 and i still look forward to reading his peppery articles in the "Y-Block"mag  

stuey 

As Frank said the thread is pipe.  There are several ways to make the attachment.  Stock had a brass fitting in the carb, with another brass male fitting that held the vacuum line.  I think the setup was to prevent misthreading at the carb.  Both of the fittings have the same male thread.  The one picture shows someone's handy method of extension making for an easier attachment of the vacuum line.

many thanks for the excellent pics....worth a thousand words.the first pic with the 3 nuts with tube are the ones.i think they are refered to as "pinch nuts".  my port is definitely not pipe thread it is 3/8 -24 . maybe i could taper the end of a brass tube nut or maybe i'll use an olive and a stock tube nut.

thanks

stuey