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Author Topic: Poly 354s anyone?  (Read 815 times)

firedome

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Poly 354s anyone?
« on: January 26, 2012, 11:34:14 AM »

I'm looking at a car with one, may need a rebuild. Anyone experienced
with polys, aka as the "semi-hemi"? I think I recall reading someplace
that parts can be on the pricey side and somewhat comparatively hard to
find... true?  Are there good sources or a book, other info? Any
particualr know issues with the poly engines in general? ... I kinda
like them 'cause they're different, you don't see them that often. And
no, I wouldn't yank  it for a 360, 440 or anything else...


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Poly 354s anyone?
« Reply #1 on: January 26, 2012, 12:17:51 PM »

A lot of the poly parts, which is an A engine which morphed into an LA engine, so there are quite a few parts that do interchange. I don't think the 354 Poly is a very common engine, maybe one or two years at best. Get the engine number on it, let's see what it is, along with what the car itself is.
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Poly 354s anyone?
« Reply #2 on: January 26, 2012, 12:25:50 PM »

As  a second thought, this is a 354 Hemi/Poly engine and parts aren't that expensive, but personally I would go for it no matter what, it was as two year engine but there are plenty of part places out there for the rebuilt/rings/gaskets/bearings/pistons, you name it, nothing too expensive since it is the Poly and not the Hemi.
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firedome

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Poly 354s anyone?
« Reply #3 on: January 26, 2012, 12:37:07 PM »


Thanks Ed... well, my '70 needs a companion, so it now looks like I've
made a deal for the car. I've been majorly missing my '58 DeSoto, so
yes, it's a '58 Mopar, and yes, a poly/hemi, or as I've heard em called, a
"semi-hemi", same block as the 354 hemi but different heads, single row
rocker shaft... but I'm sorta superstitious about car deals and don't
like to say much 'til it's safely here in the garage, and it's a looong
way off out in the New Mexico desert... but.. I will eventually post
pics and more details...  "More at 11",  as they say.
Meantime I'm gettin' really psyched!!  Forward Looks are my
favorite cars of all time.
firedome2012-01-26 17:37:53
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Brian

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Poly 354s anyone?
« Reply #4 on: January 26, 2012, 05:03:40 PM »

Find a complete top end assembly from a 331/354/392 Hemi and you can convert your 354 Poly into a Hemi.  You'll need cam, lifters, push rods, heads, rockers, intake...but very do-able.

58 Desoto adventurer convertible...right....



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Brian

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firedome

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Poly 354s anyone?
« Reply #5 on: January 27, 2012, 04:49:35 AM »

I turned down a '59 black & gold '59 Adventurer right here in
Binghamton back around 1986, because I really wanted to find a '58
Adventurer convertible... AND I had just sold my basket case,  but
super solid and complete '57 300-C convertible with a newly rebuilt
hemi,  because I wanted that '58 Adv... that I never did find...
D'OH!!! Talk about dumb. One of my stupider moves.  



And the guy in Minnesota I told about the '59 still has her!! Of the 8
known (worldwide) '58 Adv 'verts, 3 of them are in Sweden and  1
is in Italy, leaving only 4 left here. No wonder I never found one.



I know it can be done, but see no reason to try to turn it into a full
hemi, I don't care about speed anymore, and I had several of the 392s
already but never had a Poly and want to play with one... plus I think
they have the coolest looking valve covers ever! 

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Poly 354s anyone?
« Reply #6 on: January 27, 2012, 05:46:16 AM »

Well that is a great story, and didn't realize the Adventurer convertible was that rare. I think I have a personal tie between the coolness of he Poly and the 348/409 upside down W shape.
 
And stupid moves? Don't worry about that, life is long enough to give you a great chance to try to outdo yourself without a problem.
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Steve

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Poly 354s anyone?
« Reply #7 on: January 27, 2012, 10:47:19 AM »



I had one of those and couldn't give it away
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Poly 354s anyone?
« Reply #8 on: January 28, 2012, 07:04:11 AM »

354 poly or 348/409?
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Herman

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Poly 354s anyone?
« Reply #9 on: January 31, 2012, 01:18:31 AM »

I've got a 354 in my '57 Chrysler.
She's still using her factory stock pistons as received in '57, but still packs a good punch when asked...






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Poly 354s anyone?
« Reply #10 on: January 31, 2012, 06:17:34 AM »

Yep, near Hemi output with a lot less cost. Would love to pump one of these up. Thanks for the picture.
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firedome

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Poly 354s anyone?
« Reply #11 on: January 31, 2012, 09:31:01 AM »

Is that a factory dual carb rig Herman?  Nice looking engine. I'm
not sure what color 354s were originall but I don't think they were
blue.



So I've sold my '07 Shadow Aero and made the down payment now, so it
looks like with luck I'll have one (poly) soon. I'm looking forward to
playing with it... did anyone ever cover it in a book similar to "Big
Block Mopar" and "Small Block Mopar"? I have those but they don't go
into older engines at all.

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Herman

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Poly 354s anyone?
« Reply #12 on: January 31, 2012, 01:40:46 PM »

The motor should be silver. There are traces of it under the blue. Someone painted the motor somewhere in the past.

The intake was a temporary deal. It originally had a 2bbl intake.
I had bought the dualquad for my 392 Hemi but since that engine is still in the stand I thought it would look good on the 354 Poly for the time being.
But my McGyvered dualcarb direct linkage didn't work out properly as the engine had a tendency to backfire easily with this setup. So I put the original Hemi 4bbl intake on it later on.




firedome

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Poly 354s anyone?
« Reply #13 on: February 02, 2012, 04:39:34 AM »

This one has the orig 2 bbl and I'll probably just leave it that way...
a dual quad would be very cool but I couldn't afford one these
days.  I'll post a pic in another thread...

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