MC/Booster conversion

[72SB]

does the 11" booster fit on a 72 6 cyl truck?

Looking at this disc/drum one by CPP

https://www.summitracing.com/parts/c...ckup/year/1972

or do I need to get the 9"?

[Steeveedee]

I have a big block in my '70 truck with an 11" booster. You'll be fine.

[72SB]

Thanks, I was more concerned with hood clearance with the CPP unit. Yeah 6 cyl there is plenty of room otherwise

The Summit link says disc/disc for that # which is a misprint according to the Summit tech. Its for a disc/drum system. I am converting from manual to power

hey your in Simi...you ever go to R&R Cafe Coachman Cruise 1st Saturdays?

[Jason Banks]

I'm going to say it might not clear. That's why they put the offset air cleaner on power brake trucks. My pictures are of 1968 and the 1972 air cleaner sits a little lower.

Previous owner took a chunk out of the corner of my air cleaner to clear the 3/4 ton booster.



Picture from before I cleaned everything up.

[geezer#99]

I’ve read somewhere that the six cylinder air cleaner doesn’t fit with the big booster.

[Steeveedee]

Originally Posted by 72SB

Thanks, I was more concerned with hood clearance with the CPP unit. Yeah 6 cyl there is plenty of room otherwise

The Summit link says disc/disc for that # which is a misprint according to the Summit tech. Its for a disc/drum system. I am converting from manual to power

hey your in Simi...you ever go to R&R Cafe Coachman Cruise 1st Saturdays?

Never heard of it. I guess I could show up. What time is it? I do CostCo in the morning and I'm not much of a night owl.

Originally Posted by geezer#99

I’ve read somewhere that the six cylinder air cleaner doesn’t fit with the big booster.

Woops, I forgot about the offset air cleaner. A real source of misinformation, I am sometimes.

[72SB]

well the plot thickens....the 411 on "check fit" on Summit says its for the 4.1 (6 cyl)...and CPP site makes no mention one way or the other

Fortunately Summit is good on returns should it not fit. With that said I am not married to the stock air cleaner

With that said...would have to look for the circle type filter one for a 1 brl carb like the ones seen so much on....well like my 67 Camaro 4 brl car

the 9" version is for disc/disc from CPP

[geezer#99]

Make your own air cleaner.
I made several for my dual quad.
Just use 1/8 inch thick aluminum sheet.
Like in this pic.

[72SB]

if needed, this would be a plug & play swap. I would just put a breather cap on the VC instead of the hose going to air cleaner

https://www.amazon.com/Inch-Chrome-C...4&sr=8-12&th=1

or this and keep the breather hose routed to air cleaner

https://www.amazon.com/Inch-Chrome-C...75NQ1F81&psc=1

[Steeveedee]

You really should keep the breather inside the air cleaner. You will smell less oil fumes, if the truck makes any. Plus that breather cap will need cleaning to get the accumulated dirt out. If you make one like Geezer says, you can eliminate any booster clearance issues by off setting the stud hole. That would also give room for the breather hose from the valve cover.

[72SB]

breather nipple is inside the air cleaner (10") I showed

This assumes the CPP unit has a clearance issue.

Anyone install the CPP 11"?

[67 twins]

The 10 inch air cleaner will not clear that large booster. I put a K&N air cleaner assembly that is about 7 inches and that barely clears.
I'd like to go to a offset oil bath air cleaner if I could find one.

[72SB]

Originally Posted by 67 twins

The 10 inch air cleaner will not clear that large booster. .

In looking at post Jason's pic, he has about 1-1/2" cut off the stock 13" and his booster is about twice as thick as the CPP (maybe its a double bladder??)

I will find out once installed. The smaller element I linked otherwise will work. Breather cap on VC will be fine. Just like SBC PCV plumbing with breather on VC

[Jason Banks]

Yes those pictures are a double bladder like on 3/4 ton trucks. I do believe there is a chance that CPP setup might work.

I replaced that booster with a setup exactly like this:
https://www.ebay.com/itm/20184081924...EAAOSwfVpYuaoS

8 Inch dual diaphragm.

[Jason Banks]

Wish I could get a better picture, but I can't get the hood all the way up right now without it hitting something...anyway here's another view.

[72SB]

Thanks for pics Jason. Given the 11" single bladder is thinner than your double, I suspect one of the smaller air cleaner set ups I linked will work. Ideally the 10"

Won't know till I get it in or at least audition in mockup

I am not concerned about having a "stock" look for air cleaner. Having power vs manual brakes is the priority. This truck may have a 383 and 5 speed TKX sooner than later.....although the "charm" of the 6 w/3OTT is still nice....and I have 2 other "muscle" cars to satisfy the need for speed

the C10's roommate

[67 twins]

As I said above the 10 inch air cleaner will NOT fit with the large booster.
This is a pic of mine. That is the CPP booster and a 7 inch K&N. As you can see my index finger barely fits in between. You are not going to fit a 1o inch in there.

[Steeveedee]

Originally Posted by 72SB

Thanks for pics Jason. Given the 11" single bladder is thinner than your double, I suspect one of the smaller air cleaner set ups I linked will work. Ideally the 10"

Won't know till I get it in or at least audition in mockup

I am not concerned about having a "stock" look for air cleaner. Having power vs manual brakes is the priority. This truck may have a 383 and 5 speed TKX sooner than later.....although the "charm" of the 6 w/3OTT is still nice....and I have 2 other "muscle" cars to satisfy the need for speed

the C10's roommate

Pull the camera back, please, so we can see more!

Maybe I missed your reply- what time is the cruise?

[72SB]

Originally Posted by Steeveedee

Pull the camera back, please, so we can see more!

Maybe I missed your reply- what time is the cruise?

...more of the C10's roommate

and the Simi cruise is 4-8p 1st Saturday @ Rock n Roll cafe on Tapo St

another local is 1st & 3rd Saturday 7a-10a at Firestone Tire in TO mall parking lot lynn & Hillcrest

[72SB]

Originally Posted by 67 twins

As I said above the 10 inch air cleaner will NOT fit with the large booster.
This is a pic of mine. That is the CPP booster and a 7 inch K&N. As you can see my index finger barely fits in between. You are not going to fit a 1o inch in there.

well the other filter I linked will fit if the 10" does not

where did you plum into vacuum for booster? carb base or the nipple on intake manifold?

https://www.speedwaymotors.com/6-3-8-Inch-Chrome-Air-Cleaner-2-Barrel-Carb-2-5-8-Inch-Neck,713.html?sku=5504350&utm_matchtype={match_type}&msclkid=2634f9ebe6971169a6ab9b9920d8d66d&utm_so urce=bing&utm_medium=cpc&utm_campaign=SMI%20-%20Shopping%20(CSE)%20(Bing)&utm_term=4577404348890847&utm_content=All%20Products%20(Feb28_2020)

[67 twins]

Yes the smaller air cleaner you linked should fit fine.
I installed a nipple in the manifold right below the carb mounting. Mine had a pipe plug installed from the factory. Yours probably does as well.

[old51sedan]

Originally Posted by 72SB

well the plot thickens....the 411 on "check fit" on Summit says its for the 4.1 (6 cyl)...and CPP site makes no mention one way or the other

Fortunately Summit is good on returns should it not fit. With that said I am not married to the stock air cleaner

With that said...would have to look for the circle type filter one for a 1 brl carb like the ones seen so much on....well like my 67 Camaro 4 brl car

the 9" version is for disc/disc from CPP

My truck had an 11" booster on it when I bought it, it also had an air cleaner that was offset so that it sat over the top of the valve cover. I decided to go with an aluminum intake and Holly 4 barrel, I had to go to an 8" dual daiphram booster. I believe I bought everything new from Jeg's. 8" diaphragm, new master cycle, and everything back to the brake pedal for around $ 169.00 last summer. I'll post pictures, here they are, I went with cast iron headers, 2" dual exhaust. It drives down the road and stops well. Hope this helps you...

[Steeveedee]

Originally Posted by 72SB

...more of the C10's roommate

and the Simi cruise is 4-8p 1st Saturday @ Rock n Roll cafe on Tapo St

another local is 1st & 3rd Saturday 7a-10a at Firestone Tire in TO mall parking lot lynn & Hillcrest

Thanks! I turn into a pumpkin after 8 PM, but we shall see.

TO in the morning would be more doable. Do they allow scruffy old camper trucks?

That Camaro is nice! I had a '69 RS with a 327 and 4 speed, power steering, a radio and gauges. Black/Orange with a black interior; talk about hot with no AC.

[72SB]

Olds51Sedan...that is one cool engine bay. Yeah it appears the small air cleaner will be the ticket for the 11" booster

[72SB]

Did the CCP Power Booster swap. Replaced calipers/pads, all soft hoses, wheel cylinders and rear brakes. Truck stops really well now.

The MC/Booster combo was a direct fit. Has adjustable rod to pedal so I lowered the pedal some to give me knee room applying brakes without hitting column shifter

The 6 1/2" filter clears easily from the booster. Plumbed the breather into it