Originally posted by gearheadnate+Nov 17 2005, 09:09 PM--><div class='quotetop'>QUOTE(gearheadnate &#064; Nov 17 2005, 09:09 PM)</div>
<!--QuoteBegin-99SilveradoSpeed
@Nov 16 2005, 05:34 PM
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...
If I was you I would reconsider the Z06 heads on a 5.3. The Z06 heads are the same as LQ9 heads but with smaller combustion chambers. I have a book thats all about gen III engines and they put a set of Z06 heads on a 5.3 and lost HP and torque. They recomended the z06 heads on a 5.3 if it had forced induction. [/b]
I dont see how you could lose power from a set of ported polished 5.7 heads 2.02/1.57 compaired to a set of stock 5.3 heads? If this is true Im going to cancel my order for my AFR heads. LOL JK