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Re-plumbing the factory PCV to a Holley 4150/4160
#1
Hello all,

For those of you reading my carb swap post (http://www.7173mustangs.com/thread-carb-...de-71-351c) will know that I've decided to mount a 600 CFM Holley 4160 to the stock manifold on my '71.

This has brought up a (relatively minor) issue regarding the PCV plumbing. The original Autolite 4300A has a ridiculously huge 1/2" port at the back from which the PCV is connected to, via a matching 1/2" hose that connects directly to the PCV:

[Image: mustang_pcv_1.jpg]

On the other hand, the Holley 4160 has a 3/8" connection at the passenger's side for the purpose:

[Image: mustang_pcv_2.jpg]

That got me to thinking (when thinking becomes dangerous Wink ) about the factory PVC plumbing on my '79 Lincoln Continental, which has a similar 3/8" port on the back of its Autolite 2150 2-barrel (made by Holley for Ford, IIRC), and a 90-degree PCV valve with a 3/8" connection:

[Image: mustang_pcv_3.jpg]

[Image: mustang_pcv_4.jpg]

The PCV tube, I might add, slides into the 3/8" port at the back, and is sealed with the short bit of hose you see here.

Needless to say, I dare say it'll probably be easier to use the 3/8" PCV valve in connection with the Holley, but given the pressure on the line, it begs the following question:

Should I go nuts and:

A. Have a 3/8" steel line custom bent for the purpose - or bend and flare it (the tube on the '79 has a push-connect flare to prevent it from sliding too deep into the carb) myself?
or go sane and
B. Use push-lock 3/8" fuel hose?

Near as I can figure it, the push-lock hose should be strong enough, and - unlike the steel line - will not result in metal-to-metal contact between hose and intake manifold.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#2
I think I would make one up myself. Use a metal coat hanger and bend it the way you would like the line to be. Be sure to allow plenty at the bends. 3/8's tubing benders are pretty cheap, as well as the tubing at autozone or where ever.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
marks73;88149 Wrote:I think I would make one up myself. Use a metal coat hanger and bend it the way you would like the line to be. Be sure to allow plenty at the bends. 3/8's tubing benders are pretty cheap, as well as the tubing at autozone or where ever.

+1. Mark nailed it.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#4
I ran into the same problem when swapping on a Holley. Both the first 4 barrel I put no and then later with 2300 (two barrel) They both have a smaller connector and it is on the 'wrong' side.

I simply put the pcv on the passenger side. I don't think it matters which side it is on.

[Image: 1024.jpg?md=1338152942000]

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#5
will e;88155 Wrote:I ran into the same problem when swapping on a Holley. Both the first 4 barrel I put no and then later with 2300 (two barrel) They both have a smaller connector and it is on the 'wrong' side.

EDIT: Won't work on the stock covers. The recirculation to the air cleaner is located on that side - it's not a straight-up breather.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#6
It depends on what look you are going for. When I swapped on the 4 barrel I also put on an open air motorsport air cleaner so the 'stock' look was basically done for, it had a location in the base of the air cleaner for the 'in cleaner filter'. It was easy to rotate it to a clean looknig position. My current setup doesn't have a place for a filter in the air cleaner. A chrome breather like I have wouln't look too much out of place on a stock motor. You could even stick a motorcraft sticker on it. Wink

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#7
Just checked. I forgot about the PCV recirculation to the air cleaner - no chance of swapping the location.

will e;88158 Wrote:It depends on what look you are going for. When I swapped on the 4 barrel I also put on an open air motorsport air cleaner so the 'stock' look was basically done for, it had a location in the base of the air cleaner for the 'in cleaner filter'. It was easy to rotate it to a clean looknig position. My current setup doesn't have a place for a filter in the air cleaner. A chrome breather like I have wouln't look too much out of place on a stock motor. You could even stick a motorcraft sticker on it. Wink

One of the things I will not compromise on is the stock air cleaner. I love it, and it isn't going anywhere.

Stock 1970's-era Ford is the look I want, though I'm willing to accept Duraspark II and the Holley. That's just about it.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#8
I'd go with Mark's idea then. The bent tube will add to the stock look. You might try to run it almost all the way to the pcv valve, that would look kind of sharp and finished. In the very least I would take it between the firewall and the throttle bracket. Keeps it out of the way of the kick down and such.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#9
Just finished the line. The fuel hose that I'm using in the photos is too soft; it's use was purely to check fit.

For those curious, the PCV valve is a Purolator PV68C - Advance Auto's cross-reference will bring it up if you search for a 1979 Lincoln Continental (400 CID). As it was convenient, I made the line from a 3 foot section of 3/8" brake line that was also at Advance.

First picture shows the line already bent; I'm testing the initial routing (which I later revised to run under the spark plugs as per the setup on the '78/79 Lincoln Continentals):

[Image: mustang_pcv_5.jpg]

Line cut down to length and flanged. Flanging took longer than bending the tube, thanks to Advance Auto's loaner tool (a piece of crap, though what else is new?).

[Image: mustang_pcv_6.jpg]

The Purolator PV68C, with a 90-degree 3/8" port. The top port is non-functional:

[Image: mustang_pcv_7.jpg]

Painted (a bit out of place in bright Old Ford Blue, but better than bare steel and rust), and test fitted. Has quite the factory look, and that is exactly what I wanted:

[Image: mustang_pcv_8.jpg]

[Image: mustang_pcv_9.jpg]

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
  Reply
#10
Wow. Yeah, painted it totally gives the look you are going for. I imagine a lot of it is hidden by the air cleaner. looks really sharp.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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