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318 Poly to 413.... torsion bar question.....
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pistolgrip
Posted 2018-07-02 5:45 PM (#565892)
Subject: 318 Poly to 413.... torsion bar question.....


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All,

I'm planning to do a 413 long ram swap on my Poly 318 powered '61 Plymouth Wagon. Rumor has it that it would be a good idea to upgrade the torsion bars. I was told to either find a pair of big block bars, or use Imperial bars. If true, do they sell them new? Where can you get them used? Any info or input would be appreciated.


Rob
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ttotired
Posted 2018-07-02 7:42 PM (#565898 - in reply to #565892)
Subject: Re: 318 Poly to 413.... torsion bar question.....



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Not sure if you really need to.

The 318 poly is quite a lump of an engine, I don't think the BB was that much heavier

Just check the weights, but this is all said without checking a parts book which is where the answer lies

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pistolgrip
Posted 2018-07-03 10:50 AM (#565943 - in reply to #565892)
Subject: Re: 318 Poly to 413.... torsion bar question.....


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Thanks for the info! Yeah, it looks like the 413 is about 70lbs heavier than the poly 318...... according to the internet!
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mikes2nd
Posted 2018-07-03 2:14 PM (#565954 - in reply to #565892)
Subject: Re: 318 Poly to 413.... torsion bar question.....


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yeah i am using 326 torsion bars on my dodge for the 392 hemi. Its only 100 lbs heavier but I easily took 100 lbs off(intake, starter, manifold, water pump) others...

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1960fury
Posted 2018-07-03 2:40 PM (#565957 - in reply to #565943)
Subject: Re: 318 Poly to 413.... torsion bar question.....



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pistolgrip - 2018-07-03 10:50 AM

Thanks for the info! Yeah, it looks like the 413 is about 70lbs heavier than the poly 318...... according to the internet!


Do you have a link? Actually a B is lighter than a 318 and a B is only 10-15 pounds heavier than a RB. Also the Polys used more cooling water and aluminum parts for BB's are readily available.
I'd be surprised if a RB is much heavier than a Poly. Of course a BB is making more power and if you want to use it, heavier T-bars and sway bars are required.
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60 dart
Posted 2018-07-03 3:01 PM (#565961 - in reply to #565892)
Subject: Re: 318 Poly to 413.... torsion bar question.....



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poly 318 bare block with bearings and caps = 192 lbs

413 @ with same added = 220

but thats just part of it . all the ancillary parts gotta be added in but i'd run the same t bars with out a second thought as long as they aint ate up or damaged ---------------------------------------------------------later
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pistolgrip
Posted 2018-07-03 3:21 PM (#565962 - in reply to #565957)
Subject: Re: 318 Poly to 413.... torsion bar question.....


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1960fury - 2018-07-03 2:40 PM

pistolgrip - 2018-07-03 10:50 AM

Thanks for the info! Yeah, it looks like the 413 is about 70lbs heavier than the poly 318...... according to the internet!


Do you have a link? Actually a B is lighter than a 318 and a B is only 10-15 pounds heavier than a RB. Also the Polys used more cooling water and aluminum parts for BB's are readily available.
I'd be surprised if a RB is much heavier than a Poly. Of course a BB is making more power and if you want to use it, heavier T-bars and sway bars are required.



http://www.hughesengines.com/TechArticles/5engineweights.php







Edited by pistolgrip 2018-07-03 3:22 PM
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1960fury
Posted 2018-07-03 6:26 PM (#565996 - in reply to #565962)
Subject: Re: 318 Poly to 413.... torsion bar question.....



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pistolgrip - 2018-07-03 3:21 PM

1960fury - 2018-07-03 2:40 PM

pistolgrip - 2018-07-03 10:50 AM

Thanks for the info! Yeah, it looks like the 413 is about 70lbs heavier than the poly 318...... according to the internet!


Do you have a link? Actually a B is lighter than a 318 and a B is only 10-15 pounds heavier than a RB. Also the Polys used more cooling water and aluminum parts for BB's are readily available.
I'd be surprised if a RB is much heavier than a Poly. Of course a BB is making more power and if you want to use it, heavier T-bars and sway bars are required.



http://www.hughesengines.com/TechArticles/5engineweights.php





It says "Estimate" 600 PLUS for the Poly. According to a Magazin article from 57 or 58, quoting Mopar engineers, the Poly is heavier than a low deck big block. A couple of years ago a Mopar magazine bought various B/RB engines and weighed and measured them. There wasn't much difference between a B and RB angine and if I remember correctly some B/RB even weighed about the same. Also keep in mind that the Poly uses a lot more cooling water.

Edited by 1960fury 2018-07-03 6:27 PM
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1960fury
Posted 2018-07-03 6:51 PM (#566000 - in reply to #565961)
Subject: Re: 318 Poly to 413.... torsion bar question.....



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60 dart - 2018-07-03 3:01 PM

poly 318 bare block with bearings and caps = 192 lbs

413 @ with same added = 220

but thats just part of it . all the ancillary parts gotta be added in but i'd run the same t bars with out a second thought as long as they aint ate up or damaged ---------------------------------------------------------later


weigh the assembled heads of a poly and the 413. I wouldn't be surpises if the Poly heads would weight twice that of the 413's.
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