5.3 heads on 5.7 LS
Thread Starter
TECH Junkie
Joined: Dec 2012
Posts: 3,615
Likes: 1,327
From: Iowa
5.3 heads on 5.7 LS I know an old school trick with SBC was to put 305 heads on a 350, port em, and put in bigger valves. These would boost compression and still flow pretty well.
Is this a direct bolt on like it was in the good ol days? I want some practice porting heads anyway and figured i could pick up some 5.3 heads pretty easily for cheap.
Is this a direct bolt on like it was in the good ol days? I want some practice porting heads anyway and figured i could pick up some 5.3 heads pretty easily for cheap.
Yes, they're a direct bolt on. The advantage is that they have a smaller chamber, and bumps up the compression. The down side is that they have small valves. You can port them as much as you want, but unless you put bigger valves in they won't flow as well as stock 243's.
http://texas-speed.com/p-1172-prc-st...-castings.aspx
I'll be using a set of these, but with different springs to match the cam I'll be using .
http://texas-speed.com/p-1172-prc-st...-castings.aspx
I'll be using a set of these, but with different springs to match the cam I'll be using .
Last edited by .boB; Jan 25, 2014 at 04:46 PM.
I had a 06 chevy pu I put a budget 5.7 LS1 into and threw the stock 5.3 heads off the truck on the LS1 with no mods and a super baby cam. It was one of the best running LS1's ive driven outside of one with heavy mods. I sold the truck and the motor wound up back in a buddy's TA and he swears it would run circles around the stock LS1. So in a nutshell for a poorboy job with 0 high performance aftermarket parts the trick still applies
which 5.3l heads? the later ones actually got "LS6 heads" 243/799 castingsnot as small a chamber as the earlier heads but smaller chamber than the LS1 and better flow.
An earlier 5.3l might have 862 or 706 heads yes they have a small chamber for great compression but some of the 706s have porosity issues.
So which casting are you looking at?
An earlier 5.3l might have 862 or 706 heads yes they have a small chamber for great compression but some of the 706s have porosity issues.
So which casting are you looking at?
OP, i'm running PRC 5.3 heads (862 casting on a 61 cc) from Texas Speed. They have the bigger valves, port and polish, etc...for the money they do really well once they are worked over good
Trending Topics
which 5.3l heads? the later ones actually got "LS6 heads" 243/799 castingsnot as small a chamber as the earlier heads but smaller chamber than the LS1 and better flow.
An earlier 5.3l might have 862 or 706 heads yes they have a small chamber for great compression but some of the 706s have porosity issues.
So which casting are you looking at?
An earlier 5.3l might have 862 or 706 heads yes they have a small chamber for great compression but some of the 706s have porosity issues.
So which casting are you looking at?
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 https://ls1tech.com/forums/13917658-post2.html
Registered User
Joined: Mar 2018
Posts: 1
Likes: 0
I had a 06 chevy pu I put a budget 5.7 LS1 into and threw the stock 5.3 heads off the truck on the LS1 with no mods and a super baby cam. It was one of the best running LS1's ive driven outside of one with heavy mods. I sold the truck and the motor wound up back in a buddy's TA and he swears it would run circles around the stock LS1. So in a nutshell for a poorboy job with 0 high performance aftermarket parts the trick still applies
I have built a 5.7 ls from an iron block with 706 heads(changed springs), flat top pistons, mild truck cam, full length pacesetter headers. Stock program, air intake, intake manifold, throttle body and valves. Exhaust is currently open and it seems sluggish for what it is. Not sure if finishing the exhaust will fix it or if it needs other things. Stock converter also, I didn't go to a higher stall.
TECH Addict
Joined: Dec 2017
Posts: 2,181
Likes: 970
Not sure what you mean "same intake manifold on the 350".
This is a LSx motor forum. There are no "350" motors on here.
Apart from that, yes, if you have some one or another LS type motor (4.8 / 5.3 / 5.7 / 6.0) in the early 2000s kind of age range, then yes,
Not the same deal as the old small block Chevy 350, but the principles aren't that much different. The bore & stroke inside the block might change but the external dimensions of bolt-on parts like the intake manifold remain the same within the family.
This is a LSx motor forum. There are no "350" motors on here.
Apart from that, yes, if you have some one or another LS type motor (4.8 / 5.3 / 5.7 / 6.0) in the early 2000s kind of age range, then yes,
will be able to use the same intake manifold
