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Looking for some advice, I have a 2003 Silverado w/ a 4.8 and am looking to increase performance and power. I have done the small things, K&N Intake, true dual exhaust, flowmaster mufflers, cut out catalytic converters and performance tune. Debating on whether or not to add to what I have by replacing heads, headers and cam or just replace the motor?
Start here, plus there is lots of good info here.
http://www.ls1truck.com/forums/front...in-budget.html
and here
http://www.nelsonperformance.com/
What are you looking to get out of the truck?
For the money you are going to have to drop into it to really get any true performance (ie: forced air), I'd highly recommend dropping in a stroked/poked LQ4/9 block with some good flowing heads. The larger motor will get you there quicker and probably cheaper in the long run. JMHO though.