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Old 05-02-2013, 01:24 PM
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zero to ? in how many seconds/minutes?

This is my planned drivetrain in my '41 Plymouth p12 4dr sedan.
Starting with the 201 L6 motor, and boring it .030 over ( or is it .060 ) to put 218 internals into the 201? Having the machine shop do their thing, and having a new grind put on the cam. Adding 2 or 3 Carbs to the intake, and putting split exhaust manifolds for dual's and perhaps an aluminum head. What would that bring me in HP gains?, maybe from 87 stock to say 110 or so?
This would be coupled to an A-518 (42RH) 4sp. automatic overdrive, with an
8 3/4 Rear End with 3.55 gear ratio or slightly higher.
If we are talking from a standing start to say 30mph, maybe 6 to 8 seconds?, that is just a guess. I am not good at math, but if you have a 3000lb. car with 110hp., it is about .037hp. per pound. Please correct me if you think i am wrong with my figures, it would be a big help in my decision as to what power plant to use. I want to drive this car!, and i have thoughts of trying to pass someone, either on a level road, or God Forbid, a 2 lane Hiway going up a hill!
Maybe i am not thinking straight, maybe the purpose of the car would be just going from my garage to a local car show, and no Road Trips! I hope not!
Thanks!!

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Old 05-02-2013, 02:28 PM
How fast is fast enough?
 
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Ever drive a loaded 4cylinder truck (s10 or ranger)? Unloaded they're fairly light and can move okay, loaded they are one slow POS, and they come with about a 4.10 rear.

Give it more power, or more gear, or both.
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Old 05-02-2013, 05:03 PM
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How about a Volkswagen Diesel Pick-up with a 4sp, i hear ya!!
Maybe i should re-consider using my 331 Hemi, heck with the expense!
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Old 05-02-2013, 05:09 PM
How fast is fast enough?
 
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If you have the money it'd be cool but just about any v8 drivetrain swap would be adequate. Just drop in a Ls combo like everyone else.
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Old 05-02-2013, 05:34 PM
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not speed. just drivability

Yea! Like every ones Ford or Chevy with a 350, sometimes i think if i see another Rod with that combination, i'll lose my lunch! All Mopar or no car! I'll save the LS for my Chevy PU. Sorry, i have a mental condition! Nice talking with you!
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Old 05-02-2013, 06:13 PM
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In my opinion, the best way to convince this old heap to get out of its own way with the original flathead 6 on board would be with a turbocharger blowing through a 4-bbl carb. I would guestimate that you could take 140-160 hp off the end of the crank pretty reliably and that would make a respectable ride, compared to some of the slugs on the highway today.

The car would be neat with any of the stock Chrysler small blocks....273, 318, 340, 360, coupled to an AOD and twisting through an 8 3/4" posi rear.

Want to wow the troops at the Sonic? Implant a 225 slant six with a turbo and 8 1/4 rear.
The Mopar slant six engines
$ Building a Slant 6 for performance - Slant 6 Discussions - Mopar Forum
Turbocharged slant six Swinger (part 1)
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Old 05-02-2013, 06:59 PM
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slant six with 4 bbl and headers is just fine for a DD
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Old 05-02-2013, 07:07 PM
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Quote:
Originally Posted by vinniekq2 View Post
slant six with 4 bbl and headers is just fine for a DD
Absolutely! Would make a fine ride.
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Old 05-02-2013, 07:17 PM
How fast is fast enough?
 
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A turbo slant six would be pretty cool IMO. But a good intake and turbo manifold will cost as much as an Ls swap. If you don't like Ls then you can go with a new hemi take out but again it's more money.

If there's one thing mopars do well its emptying your wallet.
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Old 05-03-2013, 12:57 PM
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The slant 6 swap would require some massaging of the firewall and relocation of the radiator support. The slant 6 is a full 7 inchces longer than the short block flathead 6.

I might suggest finding a later model Mopar 230 flathead from a 50's model Plymouth or Dodge. Should not be that difficult they come up on Ebay and Craigslist from time to time. While waiting to find the 230 you could start acquiring the "speed parts" like an intake, headers, head etc and run them on the 201. Once you have the 230, yank out the 201, pull off all the speed parts, bolt them on the 230 and bolt the 230 in where the 201 used to be.

A stock 57 model 230 is rated at 135Hp, that right there alone is nearly a 60% increase in Hp. Once you open up the breathing on the flathead (which is its drawback in addition to the long stroke) with the intake and headers you will liven it up even more. Add the aluminim head or shave your stock head and you are at 150Hp or over a 75% increase from the stock 201. Not to mention the fact that the souped up flathead will draw a lot of attention and they souns sweet running through headers and dual exhaust. The long stroke really only limits the RPM you can turn with the flathead without some major work on the oiling. However, it offsets the RPM limits with tons of low end torque.

If the 230 is not enough for you look for a flathead out of a Chrysler or Desoto. These are long block versions and 2 inches longer than the 201. All you would have to do to drop a 251 in would be to move the radiator support forward and/or run an electric fan and move the front otor mount forward 2 inches on the frame. Many of the early Plymouths already had provisions for the 25 inch long blocks built into the frame as all Canadian models got the longer blocks. The only draw back to going with the longer Chrysler / Desoto long block is the availability of aftermarket intakes, headers etc. You could split your own manifolds, build your own headers, add another inlet for a seconcd carb or just hold out for the few speed parts that do come up from time to time.

Here are a couple photos of the 230 in my 48 Plymouth Coupe and a link to a video of the old 218 before I moved to the 230. The 218 was running through the cast iron headers with 2.25 inch duals, a cross over pipe and short 14 inch no name turbo style mufflers. This is when I first fired it up with the headers and intake and had not dialed everything in yet.





http://youtu.be/AxfKQ4KMM9s

Now tell me that does not look a lot sweeter than a LS1.

Last edited by hkestes; 05-03-2013 at 01:27 PM.
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Old 05-03-2013, 01:21 PM
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I was not aware of the length difference between the flathead and the slant 6. Thanks for the info.
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