5.3 w/ 317 heads how much lower is compression?
#1
TECH Fanatic
Thread Starter
iTrader: (9)
Join Date: Feb 2004
Location: Hartland, Michigan
Posts: 1,674
Likes: 0
Received 0 Likes
on
0 Posts
5.3 w/ 317 heads how much lower is compression?
what is a compression at in a 5.3 with 317 heads on it? im thinking about getting a set when i buy a supercharger. is it worth it?
#3
TECH Apprentice
Join Date: May 2006
Location: North Carolina
Posts: 361
Likes: 0
Received 0 Likes
on
0 Posts
so you don't have to lower your compression when you go FI?
I've been reading about FI applications for a little while now.. and it seems people are boltin 'em on with almost stock applications..
I've been reading about FI applications for a little while now.. and it seems people are boltin 'em on with almost stock applications..
#4
TECH Resident
iTrader: (45)
That's a subjective question. How much boost are you planning on running? If you are running the boost level that came with the kit, you are fine on the stock compression.
If you are thinking about upping the boost (say over 7-8 psi), you need to consider lowering your compression. The easiest way is to get a set of 317 heads. They've got ~72cc chambers which will drop your compression about a full point on a 5.3L. The better route would be upgraded rods and pistons to handle the additional load placed upon them from the boost, but some people don't have the cash (roughly $1500 if you do the mechanical work yourself vs $500 or so for 317 heads; the heads, good springs, gaskets & head bolts).
Put it this way; it's a long road that is very tempting. You boost today, you WILL want more. A lot of guys say they won't, few stick to it. It's just too much fun.
If you are thinking about upping the boost (say over 7-8 psi), you need to consider lowering your compression. The easiest way is to get a set of 317 heads. They've got ~72cc chambers which will drop your compression about a full point on a 5.3L. The better route would be upgraded rods and pistons to handle the additional load placed upon them from the boost, but some people don't have the cash (roughly $1500 if you do the mechanical work yourself vs $500 or so for 317 heads; the heads, good springs, gaskets & head bolts).
Put it this way; it's a long road that is very tempting. You boost today, you WILL want more. A lot of guys say they won't, few stick to it. It's just too much fun.
Thread
Thread Starter
Forum
Replies
Last Post
GrooveCityZ71
GM Engine & Exhaust Performance
7
08-31-2015 12:05 PM
07NBSChevy
GM Engine & Exhaust Performance
20
07-08-2015 07:27 PM