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1958 Plymouth 301
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   Forward Look Technical Discussions -> The Exhaust Pipe - Modification & PerformanceMessage format
 
Daria Morgandorffer
Posted 2018-08-01 3:46 PM (#567579)
Subject: 1958 Plymouth 301


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What and my intake options with the poly 301? I am wanting to convert it to fuel injection via Holly Sniper EFI and I'm looking for options. Also what are the simplest alternator conversion?
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56D500boy
Posted 2018-08-01 4:02 PM (#567581 - in reply to #567579)
Subject: RE: 1958 Plymouth 301



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First thing that you would have to decide is 2 bbl or 4 bbl Holley Sniper. The 2 bbl Sniper seems to be good to 350 hp. The 4 bbl Sniper up to 650 hp. Both probably appreciate head, camshaft and exhaust work to flow better, i.e. more $$$. Then you would have to see what 301 manifolds might be still be available for Holley 2 or 4 bbl carbs. The Sniper bases are designed around Holley carburetors. You might have to have an adapter plate made.

Good luck.



Edited by 56D500boy 2018-08-01 4:59 PM
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60 dart
Posted 2018-08-01 4:41 PM (#567584 - in reply to #567579)
Subject: Re: 1958 Plymouth 301



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this one at 700$ looks to be a really good deal ----------------------------------------------------------later

https://www.ebay.com/itm/Holley-550-510-Sniper-Self-Tuning-EFI-Kit-S...

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Powerflite
Posted 2018-08-01 4:49 PM (#567586 - in reply to #567579)
Subject: Re: 1958 Plymouth 301



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Chrysler Power sells a really good 4bbl intake. Sometimes you can find the old weiand intake that is better for hood clearance. Dual quad and six pack intakes are also available cheaper than the 4bbl.

https://cpwebstore.com/Poly/Poly-SS-X-Manifold
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56RatKing
Posted 2018-08-01 5:11 PM (#567592 - in reply to #567579)
Subject: Re: 1958 Plymouth 301


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You won't find anything as they only made very few aftermarket options for the Poly A block.

All the chrysler power/mopar/whatever will not fit. 318 LA stuff does not fit. You need A Block stuff and A block only. You won't get any additional power or economy going to Fuel Injection over the 2BBL you have. If you want more power, buy another block - you could sink 20K into that block and still get stomped by a hemi.

I say all this owning a 303 A Block.
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56D500boy
Posted 2018-08-01 5:25 PM (#567595 - in reply to #567592)
Subject: Re: 1958 Plymouth 301



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56RatKing - 2018-08-01 5:11 PM
You won't find anything as they only made very few aftermarket options for the Poly A block.


Not trying to stir anything up but I understand that the 58 Plymouth V800 had a 2 x 4 bbl manifold and that 3 x 2bbl manifolds were available in the aftermarket. Maybe a single 4 bbl 301 manifold is lurking out there on eBay.

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Powerflite
Posted 2018-08-01 5:27 PM (#567596 - in reply to #567592)
Subject: Re: 1958 Plymouth 301



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56RatKing - 2018-08-01 2:11 PM

You won't find anything as they only made very few aftermarket options for the Poly A block.
All the chrysler power/mopar/whatever will not fit. 318 LA stuff does not fit. You need A Block stuff and A block only. ....



Brian, the link I provided from Chrysler Power is for the "A" block poly motor, not the 318 LA motor.
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56RatKing
Posted 2018-08-01 6:50 PM (#567602 - in reply to #567579)
Subject: Re: 1958 Plymouth 301


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Just speaking from experience like I said. I've seen many vendors offer many things and gone through too many returns to be worth mentioning at this point.

IMHO - Better off buying a period correct HEMI or just going modern. Nothing worthwhile to be gained from the Poly A unless you are doing it for correctness (In which case modding it wouldn't make sense anyway )
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DepsilonD
Posted 2018-08-02 12:47 PM (#567636 - in reply to #567579)
Subject: Re: 1958 Plymouth 301



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The Chrysler Poly manifold will fit as it was designed for the Plymouth based Poly, as will any factory 4 barrel A-Poly manifold, or the Weiand 4 barrel. The duel quad's are pretty easy to find and the Edelbrock 3x2's seem to come in waves.
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