Will an LS1 intake and heads bolt up to a 5.3 and are the results worth it?

 

yes they will bolt up with a few modifications on the intake. No they will not be worth it, the ls1 heads will decrease compression on the 5.3 and make it a dog.

 

What about just the intake by itself?

 

nope, they have actually tested it and the truck intake works better and gives it more torque. unless your modified (highly) the truck intake will produce jsut fine so leave it alone. some guys have done it jsut for the looks though.