Quote:
Originally Posted by blazercrazy70
Just wondering if there is aNY difference in the engines from year to year in the cast block aluminum head 5.3. Other than the year they changed to drive by wire. Is the hip rating all the same on them just looking for some guidance
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Early Lm7 engines are about 270hp. 2000+ Lm7 engines had around 285hp. The lm4 is an aluminum block version of the Lm7 with around 290hp. l33 is the aluminum block engine that had around 310hp. L59 was a flex fuel motor.
Very minor differences between the engines. All good candidates for some high hp builds.
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