5.3 heads on 6.0 liter engine?
5.3 heads on 6.0 liter engine? 
01-27-2005, 09:17 AM
#3
It was my understanding that you could run 3.9" heads on a 4" bore, however there would be a .050" lip or step from the conbustion chamber to the bore which will hinder flow. Also, because of the wider bore, you can fit larger valves in there. 3.9" heads will not have the larger valves, while stage 3 heads will.
01-27-2005, 05:28 PM
#4
TECH Fanatic
Join Date: Apr 2003
Location: Albuquerque, NM
Posts: 1,109
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GuitsBoy
It was my understanding that you could run 3.9" heads on a 4" bore, however there would be a .050" lip or step from the conbustion chamber to the bore which will hinder flow. Also, because of the wider bore, you can fit larger valves in there. 3.9" heads will not have the larger valves, while stage 3 heads will.
The stock 5.3 truck heads have much smaller intake valves due to the smaller bore causing shielding and impeding the intake flow.
Also watch out on your compression ratio, it will go thru the roof!
