aluminum cylinder block definition lm4

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The LM4 engine is an aluminum block version of the LM7 and it was produced from 2003 to 2005. The GM LM4 Vortec 5300 features a V8 90 aluminum cylinder block with a fivebearings crankshaft, two aluminum heads, a single onepiece cast camshaft, and two valves per cylinder 16 in total .

LM4. The LM4 was introduced in 2003 as a lightweight version of the LM7. It was available in GM SUVs until 2005. The LM4 was also known as the Vortec 5300. L33. The L33 was introduced in 2005 as the quotHigh Performancequot 5.3L engine. It was only available in the 1/2 ton, 4WD, extended cab Silverado and Sierra until 2007.

The Gen. 3 aluminum block LM4 engine came in Chevy, GMC, Buick and even Isuzu SUVs from 200305. It was known as the Vortec 5300 and made a little less power than its aluminumblock brother, the L33. This was due to the LM4s smaller intake valve Cathedral port heads, lower compression, and a slightly smaller cam.

LM4 Aluminum Version of Standard 5.3L. The LM4 is essential all the same as a standard LM7 but with an aluminum block. Be careful when searching for engines. Many see the aluminum block and assume its an L33. The biggest giveaway with an LM4 is there is a giant hole through the oil pan for the front axle of the Trailblazer and Envoy that they ...

All LS engines are pushrod V8s with aluminum cylinder heads. Vortec series ironblock latemodel truck engines 1999 and newer are also LS based motors. They use different engine codes, but they are part of the family. Engine codes for these motors look like this LM7, LM4, L59, LQ9, and so on. LS engines can have an aluminum or an iron block.

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