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Discussion Starter · #1 ·
Hello. Need some advice regarding PCV for the street. Currently running a standard PCV valve and have gotten some advice that it needs to be tuned. Combo is as follows:

9:1 466 in 1970 Torino
Lunati Voodoo 268/276 hydraulic, (227/[email protected], .552/.564)
Toploader close ratio, 3.50:1 rear gear
Low rise BT dual quad, 1850 carbs

Tune is fine, just either a little rich or lean in part throttle cruise depending on primary IFRs, but no major issues. Makes around 16inhg at idle.

Intended use is just tooling around and having fun.

Where should the PCV be attached? Currently it's in the back of the manifold with access to all runners (I believe) although it's nearer to the rear carb. Do I need some kind of adjustable valve? Can I run it into an exhaust PCV system? Current exhaust is FPAs into full 3in pipe, x-pipe, Magnaflows with turndowns ahead of axle. Running an AFR sensor right after headers on passenger side and do not want to interfere with the readings, so would run a PCV exhaust on driver's side if that's an option, or to both sides if that's ok to do. Exhaust is pretty big for the power level, and have no experience with evac systems and just curious what others do. Thanks
 

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HI,,, Naw...What else is in the motor.. I've never heard of tuning the PCV system.... If all you have is a 466 with a cam .. I'd almost say to much carb Duel 1850's is a bunch of carb (now is that the carb number or their CFM's?)... What heads, what internals..

In a couple of your thereds your talk about running 600's and another one you talk about 450's.. I don't see much talk about anything performance in the motor other the cam, headers and the BT duel intake???

good luck take care be safe
tim
 

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PCV is best sourced from an open plenum OR under the carb with access to both sides of the septum.
Do NOT source from a runner!!!

The PCV valve itself is the meter in the system. They do not all flow the same amount of gas.






Scotty J. "AKA" The "Mad Porter"
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Ported BBF iron head specialist & Aluminum heads from all sources.
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See our products in the Vendor for sale section
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ParklandAutoMachine.com
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FWIW, I tried different PCV valves(standard and low vacuum models) on my 9.25 cr 472 that pulls 13in hg at idle. Found that a GM sourced PCV that has just a single hole in the bottom(no pintle valve inside) has delivered the best reliable/repeatable performance(as far as cheap PCV's go), I opened it slightly to fit my needs. Hope this helps
See the source image
 

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Discussion Starter · #5 ·
FWIW, I tried different PCV valves(standard and low vacuum models) on my 9.25 cr 472 that pulls 13in hg at idle. Found that a GM sourced PCV that has just a single hole in the bottom(no pintle valve inside) has delivered the best reliable/repeatable performance(as far as cheap PCV's go), I opened it slightly to fit my needs. Hope this helps
See the source image
That DOES help actually, do you recall a part number for that?
 

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Discussion Starter · #6 ·
PCV is best sourced from an open plenum OR under the carb with access to both sides of the septum.
Do NOT source from a runner!!!

The PCV valve itself is the meter in the system. They do not all flow the same amount of gas.






Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
I'll see if I can hook it up to both carbs instead of the back of the manifold. It's not on a runner, it's drilled to have access to all of them, I just doubt it's pulling equally into all of them
 

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1970 Torino Cobra 521 scj hds pump gas [email protected], [email protected] put together by the Mad Porter.
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