Chevrolet Stovebolt engine
The new six-cylinder engine was introduced in 1929 Chevrolet cars and trucks, replacing the company's first inline-four.
A balanced crankshaft was introduced for 1932, while a higher (5.2:1) compression ratio increased output to 60 hp (45 kW).
Applications: The original 194 CID engine was replaced with an improved 206.8-cubic-inch (3.4 L) variant (the stroke was increased to 4 inches (101.6 mm)) in 1933, introduced in the Series CA Eagle.
This newly revised engine put out 65 hp (48 kW), and was produced until 1936, with compression rates between 5.2:1 to 6:1.
It is often known as the "Blue Flame" engine, although that name was only officially applied beginning in 1953, and then only for the 235ci version coupled to the Powerglide automatic transmission (including in the Corvette).
In the late 1930s rival Austin decided to get into the 2-3 ton truck ("lorry") market and in a crash program based the design on the basic architecture of this "Stove Bolt" engine, except that they added detachable shell main and con-rod bearings and pressurized lubrication.
The 235 was introduced to the Chevy passenger car line in 1950, coupled to the new Powerglide automatic transmission, and 3.55:1 rear differential.
The new version used with the Powerglide transmission featured hydraulic lifters, a higher 7.5:1 compression ratio, and larger intake valves to produce more power.
The pushrod cover on the side of the engine also no longer extended across the cylinder head, to eliminate oil leaks.
[35]: 89 In 1953 the 235 engine became standard equipment in all Chevrolet passenger cars except the sedan delivery body (which continued to use the older 216 until 1954), but when coupled to the standard three-speed manual transmission (called Thrift-King in that guise) it featured solid lifters, a 7.1:1 compression ratio, and correspondingly lower power output: 108 hp (81 kW) versus 115 hp (86 kW) with the Powerglide.
A fully pressurized lubrication system with shell type main bearings in lieu of poured babbitt and aluminum pistons were also introduced in 1953, but only in the higher-output Blue Flame version in cars ordered with the Powerglide transmission.
This engine was very similar to the 235 engine, except for a different block casting with a larger piston bore of 3+3⁄4 inches (95.25 mm), two extra coolant holes (in the block and head) between three paired (siamesed) cylinders, and a slightly higher lift camshaft.
