250 Brake booster vacuum source

[NC67Chev]

I'm finally to the point of hooking everything up to complete my power brake upgrade. So, it appears that I have 2 possible vacuum sources to tap into. One on the outside of the intake that goes to the transmission and one on the inside of the intake that goes to the pcv valve. (There's a third that goes to the vacuum advance, but I know that one isn't a good choice due to the small size of the fittings). Does it make any difference? Also, what kind of T fitting should I use? Thanks guys!

[Wrenchbender Ret]

There is a pipe plug on the side of the intake manifold. Pull this plug & put in a fitting for a 3/8 vacuum hose. Hook this to the power brake unit.

[72BlckButy]

Not aware of which vacuum you will need, but would love to see some pics of your setup under the hood. You have added some great pieces to your inline, and would love to see them.

[PanelDeland]

What Wrenchbender said.Come by if you want to look at mine.
BlckButy,his truck is in awesome original condition minus the fatory optiuons he has added.I've ridden in it and it feels like it might be the year 1969.It is clean and rides like it did when it was new.

[NC67Chev]

I'll have to post a pic when it's back together. I wanted to replace the lines while I was at it, but they left out one of the front lines when they sent them. I'm hoping to get the missing line and put everything back together next weekend, but I don't know how much time I'll have.

PD, Thanks for the kind words! I can't have an indoor party in the back of mine though.... I might give you a buzz tomorrow afternoon.

[NC67Chev]

I've been meaning to post this pic for Nate (72Blckbuty).

I don't know what I want to do next...suspension, wheels, ignition, a/c. Decisions, decisions.

[pat 70/71]

Originally Posted by Wrenchbender Ret

There is a pipe plug on the side of the intake manifold. Pull this plug & put in a fitting for a 3/8 vacuum hose. Hook this to the power brake unit.

right on the money,I run my vacuum booster from the manifold & works great! I never thought six sillys made enough vacuum for a booster but they do! cheers, Pat

[72BlckButy]

Originally Posted by NC67Chev

I've been meaning to post this pic for Nate (72Blckbuty).

I don't know what I want to do next...suspension, wheels, ignition, a/c. Decisions, decisions.

Wow.... thanks for the pic of your upgrades.

And... (cough, cough) suspension.

Are you planning on keeping it all stock or lowering it, upgrading wheels?

[292farmer]

if u don't mind me asking how much was your new brake booster and master cylinder and who'd you order through. im upgrading to disc in the rear and since im getting a new prop valve to been considering getting new booster and master cylinder too. the ones i got work now but thought it would be smart to upgrade. thank you and the truck looks great from pics ive seen around.

[NC67Chev]

I actually went with a remanufactured booster/master combo from Advance. I was planning on ordering a new aftermarket set-up, but I got a coupon from Advance in the mail for $30 off any purchase greater than $100. The price for a reman booster/master combo was $105, so I paid $75 plus tax. It was just too good of a deal to pass up. I cleaned it up and painted the booster and brackets semi-gloss black, and the master cylinder and the original distribution block cast grey.

[Mark B]

NC67Chev,
I am doing the very same instal right now on my six with drums all around. I also have the same offset are filter to be installed. Are you using the original brake distribution block? Are you using residual valves?

My truck is a '70 with a different carb. Is yours a manual choke? And are you going to plumb in that hot air intake onto the air filter snorkle? To make mine work I wil have to take the automatic choke off, and am not sure I want to do that.

thanks
Mark

[NC67Chev]

Originally Posted by 72BlckButy

Wow.... thanks for the pic of your upgrades.

And... (cough, cough) suspension.

Are you planning on keeping it all stock or lowering it, upgrading wheels?

I wouldn't mind for it to be a little lower, but not a lot. From what I've seen in other posts, going back with stock height springs really elevates it. I'm thinking about 2/4, which probably would look good with stock height tires. I really want to continue running the original hubcaps, so I'm thinking about having some 15x7's made. I might go with 15x7 in the front and 15x8 in the back. I've even been looking for some local Rally's to run for a while, but 15x7 6 lugs are hard to find. It's a tough decision.

[El Jefe985]

Hey another 250. But at least yours is in its proper home. I am using the same port for my brake booster and it seems to work fine even though mine is yet to be on the road. But yours is looking good.

[NC67Chev]

Originally Posted by Mark B

NC67Chev,
I am doing the very same instal right now on my six with drums all around. I also have the same offset are filter to be installed. Are you using the original brake distribution block? Are you using residual valves?

My truck is a '70 with a different carb. Is yours a manual choke? And are you going to plumb in that hot air intake onto the air filter snorkle? To make mine work I wil have to take the automatic choke off, and am not sure I want to do that.

thanks
Mark

Yes, I'm using the original distribution block. I changed all lines over to stainless and replaced all hoses and wheel cylinders. I still have the original carb with manual choke. It runs good, so I see no need to change it. I have no plans to rig up the snorkle, although I have an nos pipe if I decide to in the future. I put a plug in the port off of the riser and turned it toward the firewall. Why will the automatic choke not work with your set-up?

[jwodahl]

can ya'll post pics of all these? about to have to do mine when i get the cab back from the body shop, figure it will be easier with pics.. lol.. i was good at "paint by number" lol

[NGN]

NC67Chev would you happen to have that V8 shroud installed ? I try using a V8 shroud with my L6 and the fan rub any info on how you installed it would be greatly appreciate .Thank again Nick

[NC67Chev]

Originally Posted by NGN

NC67Chev would you happen to have that V8 shroud installed ? I try using a V8 shroud with my L6 and the fan rub any info on how you installed it would be greatly appreciate .Thank again Nick

I installed a factory small block shroud with an 18" clutch fan. It's not exactly centered in the shroud, but it moves good air and does not rub. What diameter fan are you using?

[NC67Chev]

Originally Posted by jwodahl

can ya'll post pics of all these? about to have to do mine when i get the cab back from the body shop, figure it will be easier with pics.. lol.. i was good at "paint by number" lol

What exactly are you looking for pics of? Do you just want to see how the vacuum lines are hooked up?

[NGN]

The original 67 250 fan not sure what the size is but I'll check in the morning. What brand clutch fan yo using. Thanks.

[NC67Chev]

Originally Posted by NGN

The original 67 250 fan not sure what the size is but I'll check in the morning. What brand clutch fan yo using. Thanks.

It's a stock fan clutch that I got from a local yard. I was really after the fan. The clutch felt good, so I decided to use it. I'll measure it again and look for a part number on the fan.

[NC67Chev]

Originally Posted by NGN

The original 67 250 fan not sure what the size is but I'll check in the morning. What brand clutch fan yo using. Thanks.

The clutch fan I installed has the following codes on it:

3947772
914087 H72

I think this was a stock fan on a lot of cars with a/c. Also, while test fitting the fan shroud....I think I recall that my stock 4 blade fan also rubbed. I can take pictures for you if you think it will help.

[NGN]

Yep check my four blade fan and it's 18 inches.Sorry for going off topic but was fan clutch off a six cyl and sorry to ask but do you know for fact it's a V8 shroud. I ask cause my friends 68 6 cyl auto has a factory fan shroud which I seem to be finding out is rare. I tried the V8 shroud myself and the fan scraped just a slight bit. Never did measure my friends fan blades. Thanks again. Nick

[NC67Chev]

Originally Posted by NGN

Yep check my four blade fan and it's 18 inches.Sorry for going off topic but was fan clutch off a six cyl and sorry to ask but do you know for fact it's a V8 shroud. I ask cause my friends 68 6 cyl auto has a factory fan shroud which I seem to be finding out is rare. I tried the V8 shroud myself and the fan scraped just a slight bit. Never did measure my friends fan blades. Thanks again. Nick

The fan shroud definitely came off of a small block truck with a/c. The fan blades were not mounted when I found them at the yard, but they were from a v8 car with a/c acording to what I find online. I just measured the blades, and they actually measure closer to 17" than 18". That may be the difference.

[NC67Chev]

Here's a little more info on the fan blades I'm using:

•The 3947772 fan replaced the 779 fan and had a 2.25" pitch. It was produced by Schwitzer and was used during the remainder of the production year (and through the early 70's) and has the part number and month / year stamped on the fan blades.

This was pulled from the following Camaro site:

http://camaros.org/coolingsystems.shtml

I hope this is helpful.