Here are a few clues to help you.
Top engines were rated at the 335 hp and 366 hp.
The antenna was mounted in the windshield and radios were standard with this model for this year.
Chrysler Hemi automotive engine has been made in three generations of either V6 or V8 engines starting in the 1951 model year as the “FirePower” until 1958. The second generation was made available from 1964 until 1971 and manufacture again began with the 2003 model year. The Hemi or hemispherical combustion chamber is not unique to Chrysler products although the term “Hemi” is now a Chryco trademark although the design has been used periodically by many engine manufacturers over the years
© Clewisleake | Dreamstime.com - 1953 Desoto Club Coupe Black And Tan Photo
The hemispherical combustion chamber is bowl shaped and allows for the intake and exhaust valves to be mounted on either side of the blocks firing chambers with the spark plugs most often mounted centrally in the head(s). This allows for the intake and exhaust manifolds to be mounted on either side of the engine block which straightens out the air flow passages and is known as a cross-flow-head design. The intake side has the fuel-air mixture inlet, then combustion, and exhausted gases flow directly across the firing chamber and out the other side. This design creates a more efficient air flow than most other internal combustion engines which cause the gasses to reverse their direction of travel to be exhausted. The hemi cross flow design can offer a higher horse power rating with a similar displacement to a more conventional internal combustion engine. The increased air flow is responsible for higher hp but there is a disadvantage in that the exhaust gases can be exhausted before being fully combusted without the quench and swirl of the more common wedge designs. This engine design has intake and exhaust valves facing different directions facilitating the need of more complex rocker arm geometry. There are wider cylinders in both cam-in-block- as well as overhead cam designs making the engine wider than most other internal combustion engines. The hemi engine normally features domed piston to get the desired compression ratio while the spark plug located directly above will help to facilitate more complete combustion. The hemi engine can be more susceptible to valve ping without a higher octane fuel and will operate most efficiently at higher rpm.
© Toynutz | Dreamstime.com - Chrysler Town & Country 1948 Photo
The first Chrysler experimental hemispherical engine was to be used for the U.S. military on the Republic P-47 Thunderbolt fighter planes as an inverted Hemi V16 beginning in 1945. These experiments never reached the production stage but they gave Chrysler engineers useful development information in the operation of the two valve Hemi combustion chamber dynamics. Chrysler designers and engineers also worked with Continental on developing an air cooled V12 hemi engine used in the M47 Patton tank. The first Chrysler Hemi was marketed in 1951 as “FirePower” and the engine is over-square; that is the bore is larger than the length of the piston travel. This engine incorporates all of the principles of the Hemi Chryco learned on the military front. The first units produced in 1950 for the ’51 model year were in an overhead-valve 331 cu in (5.1 L) V8 which produces 180 bhp (134.2 kW) although it is not long before all Chrysler divisions are producing their own versions of different displacements with no or very few interchangeable parts. The Chrysler and Imperials are called the “FirePower”, Desoto has the “FireDome” while Dodge markets the “RedRam”. These three are manufactured until the ’58 model year and are collectively known as the first generation. They are easily spotted by the rear mounted distributor and the central spark plugs between wide valve covers. Race driver Briggs Cunningham used a Chrysler engine in some of his Cunningham C5-R race cars between 1953 and 1958 with a good success rate.
George lucked out during the summer of 2014; While cruising around his home town, Lisbon Ohio, he spotted a classic Buick Skylark with a "for sale"sign on the windshield. The car was at the curb, parked in front of a house, George stopped for a closer look.
The owner had not even listed it yet, and was busy making room in his too small three bay garage for the rest of his collection. The garage holds treasure to make any MCF drool-a '69 Camaro convertible, '69 Hard Top Camaro along side a '66 Impala SS convertible; all meticulously maintained or, according to George, "MCF eye candy!". The two shortly sealed a deal for the 1970 Skylark then agreed on the day and time when George would retrieve his new ride. When he picked his car up, the seller had replaced all the fluids and it was ready to drive home, although some work is already planned. The car had previously been upgraded to the GS455 engine, and is now a GSX clone. George's deal includes the original low mileage 350 engine mounted with a two barrel carburetor allowing it to be a numbers matching, factory correct version.
The car has been slightly modified, additionally equipped with an electric cooling fan to drop the engine running temperature at sustained low speeds. This Skylark GSX 455 now sports a newly re-cored radiator and will need some bottom end engine work, but George is up to this job and will have it ready to go in time for summer 2016. He is one very pleased MCF now that he has his GSX tribute car. He will keep it, as is, with the more powerful 455 under the hood and the 350 engine safely stored, so George or future owners will have the option to put the car back to its original factory state later. George has promised to update us on the progress as it unfolds, so this story is still in the making.
Images by George!
The advertising campaign in 1970 is focused on the all new "Light your fire vehicles" from the Buick Division of General Motors. The body on the mid-sized Skylark has revised sheet metal this year and it's now the entry level Buick with the Buick Special dropped from the line up entirely. In 1970 the GSX appearance package is a new addition to the GS lineup and delivers; body strips, hood tach, big tires, heavy duty suspension plus spoilers in front and rear. The roof line of the Chevy Chevelle and Skylark hard tops are identical, but in 1970, there is no pillared coupe available as a Skylark-all the units produced have two doors and are hardtops or convertibles. Buick produced 20,098 Skylarks in 1970 and 1,416 of those were with soft tops.
The basic power for the Skylark in '70 is a peppy 250 inline six, sourced from the Chevrolet Division, but the standard V8 engine for the Skylark Custom is a small block 350 mounted with a two barrel Rochester carburetor. This 350 engine can be tweaked to develop 230 hp (170 kW) at 4400 rpm. The entry level GS is powered by the 350/2 bbl., but the ultimate option is the GS455. This big block will produce 350 hp (260.99 kW)) and delivers up to 510 lb-ft (691.47 Nm) of torque to the wheels. There is a GM documented, one only Skylark unit roll off the assembly line in '70 that was further equipped at the factory with a GS455 Stage I engine option, which also includes the suspension, transmission plus brake upgrades. This ultimate Buick power package makes it a very fast, responsive and desirable, but unique muscle car. The only example is badged as a "GS" and was created due to a GM VIN# error during the production process, at least that's the reason G.M. offers.