TOPIC: 2003 Chevrolet Suburban 5.3 gets grooved

Brian Andreasen looking for more mileage out of 5.3 2003 Suburban. Engine was very shaky

before groove, now it is smooth. Has very good throttle response and pickup also.

Waiting to talk with owner this evening about modification.

Have you got any updates on gas mileage? My 2004 5.3 did not show an improvement in mpg.

GadgetmanNebraska here, Sorry, I have not heard back from the 3 5.3's I have done because they have all been in the field. They are farmers but I hope to hear from them soon.