horsepower ratings

[jerboy]

I have a 2009 5.3 rated at 315hp, and the new 5.3 is rated at 365hp, How do they increase it that much? What is the difference in the two? Thanks, just wondering

[Chris]

Different engine design. Only the displacement is shared.

[Jay P]

The biggest change was direct injection on the 2014 and newer engines vs port injection on your 2009. The compression ratio is also higher. The basic engine block is the same.

 

Jay

[BlackZ71Silverado]

In 2014, GM offered a totally different engine from the older model "Vortec" engines in our trucks. The new direct injection engines are more efficient with their fueling and compression ratios produce more HP/TQ than the older design. You can get more HP/TQ out of your engine to match the new model, it's just going to cost some money.

[kschlais]

Don't over estimate it. They are 355. Only 40 more than yours.

 

 

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