5.3L Build! (HELP)
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Hey, I need some help picking the right cam for my build. So basically what I have is a stock 5.3l engine that I知 putting 317 heads that are milled .030.. what cam will be the best for max Hp for my build. If you have any other questions just let me know and I値l try my best to answer ASAP!
#2
TECH Senior Member
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Which car, what sort of use, street, race, or both?
The following users liked this post:
SingleCabSierra (08-13-2020)
#4
TECH Senior Member
iTrader: (16)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Hey, I need some help picking the right cam for my build. So basically what I have is a stock 5.3l engine that I知 putting 317 heads that are milled .030.. what cam will be the best for max Hp for my build. If you have any other questions just let me know and I値l try my best to answer ASAP!
#5
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I read that the 317 are the same port design as the 243 and 799 so I got those and had them milled and I値l probably spray it or turbo it down the line..the 243 were just way to hard to find for a decent price
#6
TECH Senior Member
iTrader: (16)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
A standard 5.3L with 706/862 heads is around 9.5:1 compression.
A standard 706/862 head is 61CC
A standard 317 Head is about 71CC
Even if you milled them enough to achieve 65CC you would be just below 9:1 compression...
I really wouldnt worry about port shape or overpaying for 243/799 heads. You can achieve the similar flow numbers from a 706/862 head by increasing the intake valve. They have a small 1.89 valve. You can install a 2 inch valve and open the throat up when doing a valve job.
#7
TECH Senior Member
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
You might not want to go bigger than 1.95 on the intakes in a 5.3 to avoid shrouding the valves. WCCH uses that when doing 706/862 heads for 5.3's for that reason.
Trending Topics
The following users liked this post:
G Atsma (08-13-2020)
#9
TECH Senior Member
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I bet GM did it because they work pretty well in spite of any shrouding issues, flowing well enough for the trucks they were in.
The following users liked this post:
G Atsma (08-14-2020)