GMC Jimmy Engine
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A GMC Jimmy was based on the Chevy K5 Blazer. It was like a short wheel base full size truck but fully enclosed. The engines GMC used varied depending on the budget of the buyer, usage of the vehicle and fuel economy expected. The most economical engine was the 250ci 4.1 liter straight 6 cylinder engine. Unlike most 6 cylinder engines built today, this engine was an inline design so it stretched from the firewall to the radiator but left lots of room on each side of the engine under the hood. For a short time, GMC also used an upgraded 4.8 liter inline 6 cylinder engine. This was built because the 4.1 liter engine had an integrated exhaust manifold that cracked all the time making the engine fail. It was a junk engine.
The 305 liter and 350 liter engines were a welcome upgrade for folks who know their engines. These tried and true Chevy V8’s can take a beating and just keep on going. The 350 engine was the favorite for sure, especially for people who ordered the Jimmy in a 4 wheel drive version. The transfer case had a high/low option that allow the Jimmy to push through just about anything the driver wanted it to. The 400ci engine was the largest V8 gas engine offered but had thinner cylinder walls. The heaviest engine used in the GMC Jimmy was the 6.2 liter diesel engine. This was not 1 of GM’s finest diesel engines but ran well and offered a large amount of torque.
Below is a list for most of the engines installed by GMC for the Jimmy :
250 cu in (4.1 L) I6
292 cu in (4.8 L) I6
305 cu in (5.0 L) V8
307 cu in (5.0 L) V8
350 cu in (5.7 L) V8
400 cu in (6.6 L) V8
6.2 L Detroit Diesel V8