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dodge55
03-01-2005, 11:48 PM
I have a '55 Dodge with a 270 Poly engine, V8. From time to time, I see parts listed for a 1955 Dodge, 273 V8 engine. What's the difference in engines? I think the hemi is a 305 or something similar.

Dick
03-02-2005, 12:25 AM
I have a '55 Dodge with a 270 Poly engine, V8. From time to time, I see parts listed for a 1955 Dodge, 273 V8 engine. What's the difference in engines? I think the hemi is a 305 or something similar.

Sounds like a mis-print. The 273 came out in 1964.
:drool:

TK
03-02-2005, 12:27 AM
as far as i know, they made a 276 hemi, and a 277 "A" engine. the only 273 ive heard of is a "LA" but that dont mean nuthin.
heres another question to add to yours.
Whats the difference between a red ram (241,270,315,326) and the "A"(277,301,303,313,318,326)?

Dart 65
03-02-2005, 05:04 AM
The 270 and the 273 have nothing in common. The 270 is a polyspheric engine, the low buck alternative to the Hemi, but the 273 is a totally different design, sharing parts with the '67 and later 318, the 340, and the 360. As far as I know, the Red Ram engines were all Hemis, whereas the others were ployspheric engines.

Dick
03-02-2005, 07:00 AM
The 270 and the 273 have nothing in common. The 270 is a polyspheric engine, the low buck alternative to the Hemi, but the 273 is a totally different design, sharing parts with the '67 and later 318, the 340, and the 360. As far as I know, the Red Ram engines were all Hemis, whereas the others were ployspheric engines.

I believe the Red Ram was a Poly and the Super Red Ram was a Hemi. I say this because My dad had a '56 Coronet with the Red Ram Poly and years later I had a '57 Coronet D500 with the Super Red Ram Hemi


:drool: :drool: :drool:

custom880
03-02-2005, 07:25 AM
Didnt the 318 Poly and the LA engines use the same crank. I thought you could interchange them? The 276 was a Hemi engine. It was used in DeSoto's and possibly others. I had one in my 52 Firedome 8.

dwc43
03-02-2005, 08:48 AM
I believe the Red Ram was a Poly and the Super Red Ram was a Hemi. I say this because My dad had a '56 Coronet with the Red Ram Poly and years later I had a '57 Coronet D500 with the Super Red Ram Hemi


:drool: :drool: :drool:

I hada Red Ram and it's a Hemi for sure. :)

Dick
03-02-2005, 10:04 AM
I hada Red Ram and it's a Hemi for sure. :)

What year? 1955 is the year we are talking here. In 1958, the Red Ram was a 350 wedge. In '55 it was a Poly.
:drool: :drool:

Dick
03-02-2005, 10:21 AM
Here is some info from Chrysler History:


There are three engines used in the 55 Dodges - the Getaway Six, the Red Ram V8, and the super Red Ram V8. The flathead six displaces 230 cubic inches and is found only in the Coronet six cylinder models. The Red Ram V8 is a polysphere (single rocker shaft) and is used in the Coronet V8 and Royal series as standard equipment. The Super Red Ram V8 displaces 270 cubic inches (like the Red Ram V8) and has hemispherical combustion chambers. This engine has double rocker shafts and old timers call it the "double rocker" instead of the more familiar "Hemi." The Hemi is standard on all Custom Royal series and is optional on all Coronet V8 and Royal series cars. The two V8s share many internal components, and will accept manifolds and other components from the 53 and 54 Dodge Hemi of 241 cubic inch displacement.

I rest my case. :drool:

dwc43
03-02-2005, 11:52 AM
What year? 1955 is the year we are talking here. In 1958, the Red Ram was a 350 wedge. In '55 it was a Poly.
:drool: :drool:

Don't remember what year it was, cause all I had was the engine and trans. It had the clutch and converter and then the trans all mounted together like that. I was going to build it, but sold it to a guy in Murfreesboro that has a lot of mopars. IT was a Hemi with the plugs through the valve covers and it had stamped in the covers Red Ram. That's about all I can tell ya about it. :toast:

Dick
03-02-2005, 01:04 PM
Don't remember what year it was, cause all I had was the engine and trans. It had the clutch and converter and then the trans all mounted together like that. I was going to build it, but sold it to a guy in Murfreesboro that has a lot of mopars. IT was a Hemi with the plugs through the valve covers and it had stamped in the covers Red Ram. That's about all I can tell ya about it. :toast:

The Super Red Ram (hemi) may have just had the same ID on the valve covers that the Red Ram did, just like the Corvette valve covers all said the same thing, regardless if they were carbureted or FI.

TK
03-02-2005, 01:18 PM
well, he has a poly 270, whats the difference between a poly 270 and a poly 277??? are parts interchangable?

he he, look what i started. :hit:

Dick
03-02-2005, 02:38 PM
well, he has a poly 270, whats the difference between a poly 270 and a poly 277??? are parts interchangable?

he he, look what i started. :hit:

7?
:lolup: :lolup: :lolup: :evil:

TK
03-02-2005, 02:52 PM
7?
:lolup: :lolup: :lolup: :evil:

im trying to gain knowledge here and you keep cutting up! just like you dick, im always seriouse, and your always bein smart :evil:

Dick
03-02-2005, 03:24 PM
im trying to gain knowledge here and you keep cutting up! just like you dick, im always seriouse, and your always bein smart :evil:

Sorry, man. It seemed like a correct answer. Damn, I hate word problems!

So, further searching turned up this write up from a man named Bill Watson:

The poly head first appeared in 1955, with Plymouth using Dodge's 241-cid (3.44" / 3.25") block with different heads. Dodge, meanwhile, bored its engine from 3.44" to 3.63" for 270 cid. In mid-year Plymouth bored the 241 to 3.56" for 260 cid. Plymouth used the 270 with poly heads in 1956, but replaced it with a new 277 engine, the first A block. It shared little with the Dodge V8 and came only as a poly. The early hemi heads will not fit on the A block.

So, the 303-cid V8 was used, based on the 277 V8 block, with the 3.75" bore replaced by a 3.81" bore. The adoption of the 277 size over the 270 reduced costs - they could share crankshafts and piston rods.

Chrysler also offered a poly head engine in 1955 on the Windsor, using a small bore version of the 331 (3.63" vs 3.81") for 300 cid. The Windsor never came with a hemi engine, using poly heads through 1958.

The A engine was built through 1967, actually, with 1966 being the last year in the U.S. and 1967 in Canada. The US-built 1967 LA 318 has engine number prefix C318 while the Canadian 1967 poly A 318 has engine prefix CC318. (The "C" stands for the 1967 model year while the second "C" for the poly stands for Canada)

There, ya happy? :evil:

TK
03-02-2005, 07:53 PM
well, all i can say is dodge had a ford moment back then (made lots of non interchangable engines) glad they got over it. :toast:
also, plymouth/dodge/chrysler/desoto were different companies competing with each other (like GM) probably why.

TK
03-02-2005, 07:55 PM
There, ya happy? :evil:


Dick, im always happy! aint ya figured that out yet? :toast:

Dick
03-02-2005, 11:05 PM
plymouth/dodge/chrysler/desoto were different companies competing with each other (like GM) probably why.

In my youth, Desoto and Plymouth were sold under one roof, while Chrysler and Imperial were sold under another. Dodge stood on its own. When the Desoto and the Imperial went south, Chrysler and Plymouth were stall-mates.

Today, Some, if not all Chrysler dealers handle Dodge and some have the Jeep too.

Dart 65
03-03-2005, 01:40 AM
Okay, the Dodge 241 Red Ram was a Hemi, I know that for certain. The 350, however, wasn't a poly; it was a "B" engine, produced for 1958 only and used in Dodge, Plymouth, and DeSoto cars, but not Chryslers, since they were in the last year of the Hemi. Dick: the reason that Plymouths were sold along with Dodge, Chrysler, and DeSoto cars was because Walter Chrysler realized that Plymouth was going to be the company's saving grace, given both the Depression and the Airflow debacle. He ordered the Plymouth line sold alongside the others. It seems that the marriage of the Plymouth and DeSoto lines was among the most short lived; I rarely see any merchandise with the two together.

TK
03-03-2005, 01:58 AM
cool! history lessons! Thanks guys!
so, red ram was "dodges engines"? they included hemi, poly, and wedge?

Dart 65
03-03-2005, 02:08 AM
Yes, the Red Ram name seems to have been applied to whatever the "hot" engine setup was, specifically in the D500 package.

Dick
03-03-2005, 02:40 AM
cool! history lessons! Thanks guys!
so, red ram was "dodges engines"? they included hemi, poly, and wedge?

The fact that Dodge used to have a Ram's head as a hood ornament, the last being Pre-'93 trucks, and the fact that the full size trucks are called Rams isn't just a coincidence. Dodge has played the Ram card for years.

pcrmike
03-11-2005, 10:05 AM
I just found a 53 DeSoto here in town with no rust holes, straight, no bondo, Hemi, 2-speed auto, four doors, and restorable interior for 800 bucks. All the brightwork and trim is on the car save for one door handle, and the hood ornament is rotted. If you are interested, shout back. :-) PCRMike :shades:

Tim Keith
03-12-2005, 12:52 AM
I think the Dodge 241 and the 270 are low deck motors. The 315 and
325 are raised deck. The 325 is the same as a 315 with a larger bore.
I believe the 325 Dodge has a square bore/stroke. I believe you can
not convert a Dodge Poly motor to a hemi.

DeSoto 276 and 291 are low deck, I believe the 330, 341 and 345
are tall deck. The Adventurer motor is overlooked, it actually achieve
1 hp per inch with hardly any recognition. During these years the
DeSoto V8 has the distrinction of always being a hemi.

I think the first run of Plymouth V8s might have been a variant
of the Dodge poly. Which brings up a question, how do you identify
the displacement of a Chrysler spitfire motor ? I often come across
the Spitfire motors, heads for a 354 Hemi are also not hard to
find. I have heard that the intake manifold and pistons are the
parts needed to convert a Spitfire to a 354 Hemi. Has anyone
here created a Hemi from a Spitfire short block?