hey, i have no idea what this hole is for, any help??

click here for the pic:

http://img380.imageshack.us/img380/4...rts10115ay.jpg

 

mine just has a plug in it but it is for a Temp sending unit or similar. their should be another one on the opposite side of the manifold too.

 

yes there is a open plug in there. heater hose goes in the opposite one doesnt it?

and so i should just plug this one right. any chance you know what size it is so i can look for a plug?

 

you can use a 1/2 " pipe plug from a hardware store

 

1/2" pipe plug, thanks alot, ill get to the hardware store tomorrow and get one.

 

Are they on the back runners as well?

I'll have to say that's a return spring mounting that I've never seen before.

 

i rigged that up myself, not sure where else to put it lol

 

Fix that spring, Its an insult to all chevy owners

I drilled a small hole down where the TV cable hooks up on the throttle linkage and ran the spring back to the cable brackets where its supposed to go

 

I don't like the spring-on-the-bottom-going-to-the-rear set-up, personally. It puts both the spring return force and the throttle application force on the back of the throttle shaft, promoting wear.

Having the return spring on the top and to the front is a much better balanced set-up from a shaft wear standpoint.

 

yeah it wouldnt work in the back? the spring makes the throttle come back, if i dont have it on it doesnt come back to where it sits.

but the spring brings it back, where i have it now

 

84z28350 was talking about the stock arrangement. Instead of hooking the spring to the top of the throttle shaft lever, the factory puts it on the bottom of the throttle shaft lever and runs the spring towards the rear.

So, does your manifold have those ports on the rear coolant runners or not?

 

im not sure, its an edelbrock torker, heres a pic..

 

one more question...if im not mistaken.. there was a hose coming from the brake booster into the intake, is this true?

because on this intake there is no spot for it?

 

Check the back of the carb for a brake booster port you can use instead.

 

ok i run an edelbrock performer 750cfm ill look it up on the net, but if someone knows where, let me know.

 

Performers have a 1/4" NPT port on the back that you can thread a hose barb into.

 

a 1/4" hole i can wrap a hose onto. ill look

you wouldnt happen to know where i could get a diagram do ya.

 

A diagram of what, the carb? It's the only hole on the back of the carb.

 

oh only one hole, there is one hole in the middle of the carburetor it has what looks like a pipe plug on the back, with an allen key in the middle of it.

is that it?

 

That's the one. Replace the plug with a hose barb.

 

ok and this is ok for the brake booster and the carb?

 

Stick the hose from the brake booster onto the barb that you put in that hole.

 

i never meant that

but i mean is it ok to do this since its suppose to be in the intake

 

also, the hole i found in the front, i was told to put a 1/2" pipe plug in it, can i use it for the brake booster instead of the back of the carburetor.

if your look at the engine its to the right of the thermostat, there is a pic above.


thanks for the help in advance.

 

The port on the back of the carb is for the brake booster, it's the same as connecting it to the manifold port.

The port on the front of the manifold is for coolant, not vacuum. If you connect your brake booster to there you'll fill it with antifreeze.

 

your brake booster will work fine hooked to that port. i noticed that you have an old style intake with an oil fill/ vent hole. it is next to the thermostat going all the way through the intake. if i were using that intake i would plug that, also. it is not needed unless you use breatherless valve covers or no pvc.

 

yeah i bought a pipe plug for it today.

thats another question.

on the older valve covers i had a pcv valve hooked up

everything from the block up has been replaced including edelbrock elite tall valve covers.

do i need to hook up the pcv valve again??

 

Yes, you need a working PCV system of some sort.

 

the back of the carburter is not 1/4" ****

i shoulda measure it myself, its alot bigger.

 

I've got 2 of them right here on my desk with 1/4" NPT ports on the back.

 

what is NPT port?

i just went to the hardware store asked for a 1/4" hose barb

and its too small going into the edelbrock carburetor

need something a little bigger

 

NPT = National Pipe Tread. It's a tapered thread not shared with ANY other type of fastener. The NPT measurements (1/4", 3/8", 1/2", etc.) are also not comparable with ANY other type of fastener. A 1/4" NPT thread is HUGE compared to a standard 1/4" bolt thread, for example.

You need a hose barb that is 1/4" NPT thread on one side (to screw into the carb body) and has a 3/8" hose barb on the other end (to attach the vacuum hose going to your brake booster). You might want to take the carb and the brake booster vacuum hose into a hardware store with you so you can be assured the fitting you buy will both fit the carb and take the vacuum hose before you purchase it. Parts get mis-marked sometimes sitting on the shelf.

Also.... do NOT over-tighten the fitting into the carb. Rember the threads are TAPERED and they push outward on the carb body as you tighten it down. This can easily crack the body of the carb if you overdo it. Then you really will be f-ed. Just snug is plenty good. It'll never really feel like it "bottoms" and stops, it'll just get tighter and tighter. You can always tighten it more later if you need to.

 

Its for either a temp sensor or a heater hose fitting. If you don't need it, buy a brass plug and cap it.

 

ok well i took out the little thread thing with the allen key that comes with the carburetor.

i unscrewed it brought it to canadian tire and got a hose barb 3/8's which fits the 1/4" i got does not fit.

Clint

 

Maybe it was just me but i didnt quite catch the 3/8 and 1/4 thing...

 

oh i got a hose barb with 1/4" and it didnt fit i could put it right in the back of the carburetor it just slid in and out.

i went to canadian tire with the original screw that was in the back of the carburetor and matched it up to a 3/8" thread, so i bought that.

 

The brake booster hose has a 3/8" I.D. The port on the back of the carb has female 1/4" NPT thread. A fitting is needed which has a 3/8" host barb on one side and male 1/4" NPT threads on the other.

 

From left to right are a 1/4", 3/8" and 1/2" NPT plug. You can see how they're slightly larger than their size suggests.

I tried turning them sideways to try to show how they're tapered, but they keep rolling off the scanner.

 

i understand what your saying

but i purchased a hosebarb with 1/4" thread and it just fits in the hole i can slide it in and out, its too small.

i bought the 3/8" thread hose barb and it fits perfect

 

That's a little strange. The 1/4" plug in the picture above was removed from an Edelbrock carb seconds before being scanned.

 

not sure its weird, i just went downstairs, and tightened one into the back of the carb, it was 3/8s

thats weird

 

Just for fun, can you measure the O.D. of your plug?

 

on the measuring tape its almost 1/2"

 

A 1/4" NPT plug is a little over 1/2" O.D, a 3/8" plug is a little under 11/16" O.D. It sounds like they're describing the barb by the hose size instead of the pipe size.

 

My brock 1406 600cfm carb had a 1/4 npt plug in it...

Maybe you got one with an 1/4 ipt plug (get it?)