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Poly 2x4
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   Forward Look Technical Discussions -> The Exhaust Pipe - Modification & PerformanceMessage format
 
ttotired
Posted 2019-05-21 6:04 PM (#582388)
Subject: Poly 2x4



Expert 5K+

Posts: 8446
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Location: Perth Australia		I don't remember seeing one hogged out like this before

Whats the thoughts?

https://www.ebay.com/itm/Mopar-Dodge-Plymouth-318-Poly-Block-Dual-Qu...





(2x4 hogged outs.jpg)



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Attachments 2x4 hogged outs.jpg (108KB - 561 downloads)
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Powerflite
Posted 2019-05-21 8:01 PM (#582395 - in reply to #582388)
Subject: Re: Poly 2x4



Exner Expert 10K+

Posts: 10016
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Location: So. Cal		Someone butchered it.
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ttotired
Posted 2019-05-21 8:48 PM (#582397 - in reply to #582388)
Subject: Re: Poly 2x4



Expert 5K+

Posts: 8446
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Location: Perth Australia		I read that the 4 barrel nailhead manifold really benefits from having the individual holes
opened up to make left and right openings into slots. Not sure about how far this one has been done though.
It seems to have a big plenum area, so I would assume better for high rpm

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wayfarer
Posted 2019-05-22 12:18 PM (#582406 - in reply to #582388)
Subject: Re: Poly 2x4



Elite Veteran

Posts: 906
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Location: Peoples Republic of Oregon		Really has no effect on performance of the manifold itself...just allows for bigger carbs without a 'funnel'
Like Powerflite says..butchered...
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ttotired
Posted 2019-05-22 5:16 PM (#582423 - in reply to #582388)
Subject: Re: Poly 2x4



Expert 5K+

Posts: 8446
50002000100010010010010025
Location: Perth Australia		OK. I wont go as far as that with mine, but I will be either using 2 500cfm edelbrocks
like I did on the dodge or having a go with twin throttle body injection once the Plymouth is on the road (Be done with the 2 barrel first)

With the dodge, to fit the eddies, I had 2 alloy spread bore to square bore adaptor plates
(carbs were advertised as square, but the secondaries were bigger that the primaries) and I
was also having hot starting issues that then required phenolic plates between them and the carbs as well.

I ended up having to modify my air cleaner to fit under the bonnet

Hogging out the manifold to clear the butterflies or at least improve the airflow through the top of the manifold when you need to adapt
to different mountings must improve it somewhat.

If you were able to find and use factory carburettors, then opened up manifolds like that one wouldn't be any good (I guess)

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