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Old 12-05-2020, 05:33 PM   #41
Norris McCarty
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Default Re: “Inside” part of road draft tube

Finished the pcv valve install last night.
Installed the tube beneath the manifold. Drilled and tapped the manifold at the road draft tube location and the carb block off plate for 1/4” pipe thread brass fittings. I’m using 3/8” emissions hose currently but will go 3/8” copper line as the final setup. I tried 5 different pcv valves settling on the Borg Warner PV255. This was more about “operation” than fit.
I set it up first with clear 3/8” line so I could see the “flow” of the very light oil mist as it moved from the block to the intake manifold with the different valves. The PV255 flowed the best at low vacuum RPMs and didn’t “leak” vacuum at idle or light cruise RPMs. I had a vacuum gauge setup along with my wideband gauge to keep track of lean/rich situations.
The PV255 valve worked best in a vertical position. I believe this is the best valve for a hot rod flathead....it is at least of the 5 different valves I tested.
I’m extremely pleased with the results. Drove the car almost 40 miles at 65-75mph this morning. Pulled into my shop and didn’t have a single drop of oil even begin to form on or around the oil pan or dipstick. Previous to this mod there would have most certainly been a drop or two at least form.

It’s extremely important to make sure that if using a performance manifold with separated plenums to join the plenums in some manner. Thanks to Merc’s suggestion I was able to do this in the least invasive way. Thanks Merc!


Thank all of your for your help with this little project!
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Old 12-05-2020, 06:49 PM   #42
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Default Re: “Inside” part of road draft tube

.

What I figured-out during our project and in my original research on the subject is that your PCV valve selection needs to mimic the approximate cubic inches (displacement) and paying attention to the parameters of a performance camshaft. Performance cams usually allow LESS vacuum than a stock cam. We ended-up selecting a PCV valve for a 302 cu. in. (original Z28) Chevy which obviously has a performance cam, in view of the fact that Heard's new flathead is 284 cu. in. (fairly close) with a performance cam. For sure, we wanted to utilize one of those small, GM-type metal PCV valves. DD
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Old 12-05-2020, 07:02 PM   #43
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Default Re: “Inside” part of road draft tube

Yep....all of the ones I tried are for engines with displacements very similar to my flathead. The one I settled on is for a 283 SBC.
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Old 12-05-2020, 07:06 PM   #44
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Default Re: “Inside” part of road draft tube

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Yep....all of the ones I tried are for engines with displacements very similar to my flathead. The one I settled on is for a 283 SBC.
But like I said, you ought to factor-in the vacuum characteristics produced by your cam. I can't think of any 'late', factory-performance 283s with a cam....that had a factory PCV valve. DD
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Old 12-05-2020, 07:12 PM   #45
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Default Re: “Inside” part of road draft tube

All I know is that it works. The Max1 is not a radical cam.
There may be a valve that “fits” better, but I’m pleased.
If you know of a better pcv valve for my engine, give me a part # please..... I’ll try it!
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Old 12-05-2020, 07:15 PM   #46
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Default Re: “Inside” part of road draft tube

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Quote:
Originally Posted by Norris McCarty View Post
All I know is that it works. The Max1 is not a radical cam.
There may be a valve that “fits” better, but I’m pleased.
If you know of a better pcv valve for my engine, give me a part # please..... I’ll try it!
YOU're happy, and that's what counts! I was just trying to keep folks who are interested in doing something like this aware of SOME of the details to consider. YWB
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Old 12-05-2020, 08:09 PM   #47
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Default Re: “Inside” part of road draft tube

Quote:
Originally Posted by Norris McCarty View Post
Finished the pcv valve install last night.
Installed the tube beneath the manifold. Drilled and tapped the manifold at the road draft tube location and the carb block off plate for 1/4” pipe thread brass fittings. I’m using 3/8” emissions hose currently but will go 3/8” copper line as the final setup. I tried 5 different pcv valves settling on the Borg Warner PV255. This was more about “operation” than fit.
I set it up first with clear 3/8” line so I could see the “flow” of the very light oil mist as it moved from the block to the intake manifold with the different valves. The PV255 flowed the best at low vacuum RPMs and didn’t “leak” vacuum at idle or light cruise RPMs. I had a vacuum gauge setup along with my wideband gauge to keep track of lean/rich situations.
The PV255 valve worked best in a vertical position. I believe this is the best valve for a hot rod flathead....it is at least of the 5 different valves I tested.
I’m extremely pleased with the results. Drove the car almost 40 miles at 65-75mph this morning. Pulled into my shop and didn’t have a single drop of oil even begin to form on or around the oil pan or dipstick. Previous to this mod there would have most certainly been a drop or two at least form.

It’s extremely important to make sure that if using a performance manifold with separated plenums to join the plenums in some manner. Thanks to Merc’s suggestion I was able to do this in the least invasive way. Thanks Merc!


Thank all of your for your help with this little project!
Ya' that's an advantage I noticed after installing my system.
Had a small leak at the front crank seal before and virtually none after installation.
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Old 12-06-2020, 02:09 PM   #48
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Default Re: “Inside” part of road draft tube

Could you please post the part number for the 283 PCV valve? I would like one that has the 90 degree elbow on the top but can work around that if needed.

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Old 12-06-2020, 02:30 PM   #49
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Default Re: “Inside” part of road draft tube

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Could you please post the part number for the 283 PCV valve? I would like one that has the 90 degree elbow on the top but can work around that if needed.

Sent from my SM-G973U using Tapatalk

Quote:



"I tried 5 different pcv valves settling on the Borg Warner PV255."



Terry
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Old 12-06-2020, 04:08 PM   #50
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Default Re: “Inside” part of road draft tube

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"I tried 5 different pcv valves settling on the Borg Warner PV255."



Terry
Thanks!

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Old 12-06-2020, 06:23 PM   #51
Norris McCarty
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Default Re: “Inside” part of road draft tube

Quote:
Originally Posted by msstring View Post
Could you please post the part number for the 283 PCV valve? I would like one that has the 90 degree elbow on the top but can work around that if needed.

Sent from my SM-G973U using Tapatalk
The 90 degree elbow was off of the “help” rack at Oreillys
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Old 03-06-2021, 04:05 PM   #52
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Default Re: “Inside” part of road draft tube

Norris, Check with Tom Stewart, of Flat Head Sales, Riga N.Y. ... He is my local flat head engine guy, who has been doing engines for close to 50 years... His number is 585-293-3203... He doesn't throw much out, so I think you have a good chance, for getting your needed tube...
.....Lou.....
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