5.3 turbo need advice
Thread Starter
Teching In
Joined: Apr 2013
Posts: 17
Likes: 0
From: Blue Springs, MO
5.3 turbo need advice Hello everyone. I am new to this and am building my first 5.3 turbo. What I have is a lm7 block with 706 heads. I am wanting to get to the 700hp mark and here is what I'm thinking. Arp head studs and rod bolts, ls7 lifters, ls6 cam springs and intake, ls9 head gaskets, and an on3 76mm turbo. Am I on the right track or do I need to change my game plan? Also can I use the heads I have or do I need to find new ones? Like I said I am new to this site and this is my first build. Any help would be greatly appreciated. Thanks.
I'm doing a similar budget build, hopping on the 5.3 turbo bandwagon and all of its glory. Im hoping to see 800-ish WHP with the possibility of pushing it to 900. After reading a lot of 5.3 turbo threads, it seems many people are recommending the S475 (pretty inexpensive at around $700) for a single, or if your doing twins like me, to try to get On3's or CX Racing turbos similar to precision 6262's. I think I'm going to go with the ebay GT35's, I'm no turbo expert by any means, Im just regurgitating info Ive found on other threads.
I wonder how much bigger the S475 housing is than a GT35? My main reason for wanting to do twins is because I haven't seen a large (or even med-large) single fit inside the GTO engine bay. We have little to no room, and the best bet seems to be battery relocation along with a couple other things, to barely squeeze a pair of twins in the original battery and airbox location..
I wonder how much bigger the S475 housing is than a GT35? My main reason for wanting to do twins is because I haven't seen a large (or even med-large) single fit inside the GTO engine bay. We have little to no room, and the best bet seems to be battery relocation along with a couple other things, to barely squeeze a pair of twins in the original battery and airbox location..
s475 > http://i217.photobucket.com/albums/c...N/P1010017.jpg
gt35> http://4.bp.blogspot.com/_-vxlkQsFsc...0/S1050051.JPG
Last edited by LS5.3stang; Apr 17, 2013 at 04:35 PM.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote Thread Starter
Teching In
Joined: Apr 2013
Posts: 17
Likes: 0
From: Blue Springs, MO
Heads will be perfectly fine. Some studs and some valve springs and you should be golden. On mine I went the extra mile and got a $150 valve job and did the trunion and pushrods to go with the valve springs, but that is it.
I think your right on this one. Just read through Denham's 2500 build thread and saw his results....even though his is a 6.0 and Im doing a 5.3 like the OP here, the S475 does seem like it would be a great choice. I still have the problem of space for such a big monster so what are your thoughts of running twin T70's or T76's by CX racing on a 5.3? (Sorry to thread jack OP, but hoping this can contribute to you as well).
TECH Resident
Joined: Nov 2011
Posts: 916
Likes: 5
From: Las Vegas, NV
I think your right on this one. Just read through Denham's 2500 build thread and saw his results....even though his is a 6.0 and Im doing a 5.3 like the OP here, the S475 does seem like it would be a great choice. I still have the problem of space for such a big monster so what are your thoughts of running twin T70's or T76's by CX racing on a 5.3? (Sorry to thread jack OP, but hoping this can contribute to you as well).
https://ls1tech.com/forums/forced-in...on3-70mms.html
I think the small turbine on these actually helps when running twins. Just my thoughts.
Wicked69 is having pretty good luck running twin On3 Performance 70mms:
https://ls1tech.com/forums/forced-in...on3-70mms.html
I think the small turbine on these actually helps when running twins. Just my thoughts.
https://ls1tech.com/forums/forced-in...on3-70mms.html
I think the small turbine on these actually helps when running twins. Just my thoughts.
I read through Wicked's thread the other day and from what hes posted up I didn't get any definitive results with the 5.3 and twin 70's. Seems like he blew his motor on that pass he posted up and went to a 6.0...would have been nice to see a dyno graph.
Awesome. Is there a build thread? I think Im following at least 5 of them right now similar to what were all doing haha. What I would give to see some side by side track times and or dyno graphs comparing the different available CX, On3 etc...turbos on a 5.3!
Here is the thread. He has not updated it in a while, but he is about to get back on it now that he has moved up my way and got settled back in.
https://ls1tech.com/forums/conversio...bo-83-s10.html
https://ls1tech.com/forums/conversio...bo-83-s10.html
