Why use 5.3 heads?
11 Second Club
Joined: Feb 2002
Posts: 639
Likes: 0
From: Norcal
Originally Posted by Mack'sZ28
Isn't cheaper to get the 5.7 heads milled?
Originally Posted by mike m
plus 5.3 heads out flow the 5.7 heads.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I've got a spare set I'll trade someone. Stock for stock. I wanna lower my compression, so the ls1 heads would work out good for me.
FYI, it moves the 5.3 from 9.5:1 to ~9.1:1
FYI, it moves the 5.3 from 9.5:1 to ~9.1:1
A few headporters I have talked to say the 5.3's flow a tiny bit better after they finish them. The difference is very little (1-2cfm's from what I gather) Also a stock LS1 is 10:1 CR by adding the 5.3's you will have around 10.8:1 CR. Also you can add a bigger cam because you dont have to mill the heads for the added Compression.
If lower compression is what you want you need to try and trade the 5.3's for the 6.0 truck heads. The 6.0 heads will take a stcok LS1 from 10:1 down to 9.4ish:1 CR. Works greak for the FI guys wanting to run 10psi. Plus the 6.0 heads are better in almost every way then the 5.7 LS1 heads and the 5.3's
If lower compression is what you want you need to try and trade the 5.3's for the 6.0 truck heads. The 6.0 heads will take a stcok LS1 from 10:1 down to 9.4ish:1 CR. Works greak for the FI guys wanting to run 10psi. Plus the 6.0 heads are better in almost every way then the 5.7 LS1 heads and the 5.3's
TECH Enthusiast
Joined: Feb 2004
Posts: 743
Likes: 0
From: Foley, Alabama-southern Alabama
Whats the biggest valves you can put in 5.3s, I know you have to put new valveseats ,can you put 2.05 and 1.6s??Bore will be 4.030 also are 5.3s 61cc,s?How much can you mill a 5.3?
Launching!
Joined: Oct 2002
Posts: 224
Likes: 0
From: Cayman Islands
Originally Posted by ls1/7
if you go with a nice size cam and a set of stage 2 5.3 heads will it be ok to spray like 150 shot on that compression? i know ill have to retard the timing just wondering if it would be ok
Will be fine as long as you can get enough fuel. (injectors/pump might be needed)
93 octane would should work just fine.
People have been milling 5.7 for forever and spraying. Many people spray the LS6 heads which are 10.5 CR the little extra compression wont hurt a thing.
93 octane would should work just fine.
People have been milling 5.7 for forever and spraying. Many people spray the LS6 heads which are 10.5 CR the little extra compression wont hurt a thing.
