hey guys,
i can soon aqcuire a set of Z06 heads and Z06 cam brand new for about 800 dollars through a friend...

i have a 99 ECSB silverado with the 5.3...

how much of a performance increase would this add???

i currently have just the K&N intake and BORLA exhaust...

also is this a good combo to put on my engine for a decent daily driver HP upgrade????

thanks guys...