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Anyone running twins on stock 5.3?

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Old 10-20-2016, 11:14 PM
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Default Anyone running twins on stock 5.3?

After helping with my single 76 L33 build my buddy is starting on his own project, a 1940s Thames panel truck gasser build. After doing a single on my car he decided he wants to try some twins. Plan is to use the Engine he has which is a bone stock 5.3 with no intentions of opening it up other than swapping out for some PAC 1218s and an ls1 intake for hood clearance, plan is to use tried and true 80#ers with necessary fuel system. He is looking for somewhere in the 5-600whp range on pump gas no meth. No ET goals or anything serious like that just building a fun cruiser for the fun of building a different that just got pulled out of storage after 30 years.
Just curious what a popular size/brand guys are having good luck with. There are tons of options from what I have seen but no sense in reinventing the wheel since I see a lot of guys that have sorted well designed projects and figure I should tap into knowledge here so I can pass it along.
Old 10-21-2016, 08:05 AM
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Check out this build. It would fit your buddies needs and spools lightning fast. I've seen it run in person. And it a relatively inexpensive set up as well.

https://ls1tech.com/forums/forced-in...ing-twins.html

Are you planning on running E85? That or pump gas and meth without an intercooler would fit better in the Thames. That thing will be an animal with 600rwhp. and an 80 something inch wheelbase!
Old 10-21-2016, 09:23 AM
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I'm doing a 5.3 TT build sill a few months from running but it should be nice when done.
https://ls1tech.com/forums/forced-in...ime-build.html
Old 10-22-2016, 01:59 PM
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Twin 50 trims will get you to your goals. I would not go larger than 61s.
Old 10-22-2016, 08:53 PM
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Originally Posted by Bad Apache
Check out this build. It would fit your buddies needs and spools lightning fast. I've seen it run in person. And it a relatively inexpensive set up as well.

https://ls1tech.com/forums/forced-in...ing-twins.html

Are you planning on running E85? That or pump gas and meth without an intercooler would fit better in the Thames. That thing will be an animal with 600rwhp. and an 80 something inch wheelbase!

Just planning on good ole 93 pump gas...I took a look at that thread you posted but didn't see the what specific turbos he was using listed?
Old 10-22-2016, 09:18 PM
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Originally Posted by wildcamaro
Just planning on good ole 93 pump gas...I took a look at that thread you posted but didn't see the what specific turbos he was using listed?
His signature says 50mm twins. Not sure which specific ones though....
Old 10-22-2016, 11:13 PM
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Bone stock 5.3 with nothing but valve springs. They are twin t3 55mm compressors. Cheapo ebay internal wastegate units. Still sorting out issues, but it spools extremely quick. Into positive pressure by 2300rpm.


Old 10-23-2016, 07:03 AM
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Originally Posted by wildcamaro
Just planning on good ole 93 pump gas...I took a look at that thread you posted but didn't see the what specific turbos he was using listed?

Page 4 has a link to them. I think 57's.
Old 10-24-2016, 03:07 PM
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Originally Posted by Bad Apache
Check out this build. It would fit your buddies needs and spools lightning fast. I've seen it run in person. And it a relatively inexpensive set up as well.

https://ls1tech.com/forums/forced-in...ing-twins.html

Are you planning on running E85? That or pump gas and meth without an intercooler would fit better in the Thames. That thing will be an animal with 600rwhp. and an 80 something inch wheelbase!
Yea it should be pretty dang cool when raked and rolling...still trying to figure out intercooler or non-intercooled with meth, Turbo location, etc...

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Old 05-07-2017, 07:12 AM
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Any updates with your buddies project? I'm starting my twin turbo build with .67/70s.



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