I have a 1999 5.3 chevy truck and I was wondering what's the biggest cam you can put into a stock engine. Without having to change everything? I was wanting to get more power out of it.

 

What do you mean by "change everything" ? 99% of the cams out there will require you to change valve springs and push rods, and if its a auto trans you'll need a higher stall converter.

 

This^

And do NOT go with the biggest cam you can fit in there lol

 

We have a cam special designed just for 4.8/5.3/6.0 truck engines.

Custom Comp cam with new .560" beehive springs for $399 shipped for a limited time.

Cam specs are as follows:
BTR Stage I truck cam 206/212 .525/.534 114+2
BTR Stage II truck cam 212/218 .553/.553 113+2
BTR Stage III Truck cam. 218/224 .553/.553 113+3

All are on the shelf, ready to ship.