Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

How to use TBSS intake on Gen 3 5.3L.

Old 01-05-2019, 10:46 PM
Registered User
Thread Starter
Join Date: Jan 2019
Posts: 2
Default How to use TBSS intake on Gen 3 5.3L.

I am building a 2004 lm7 and bought a TBSS intake. I am wandering how I am going to make this work. The TBSS intake port is a different size then the gen 3, and I canít order a tbss throttle body because it is a 6 prong connector and mine is an 8 prong. Any advice would help.
Matthew Kane Powell is offline  
Old 01-06-2019, 12:09 AM
TECH Senior Member
Join Date: Jun 2016
Location: Central Cal.
Posts: 10,526

The TBSS is still a cathedral port and will work on your engine. Not all Gen IV's are rectangular port. The LS2 the manifold came off of is a cathedral port engine. Look at the manifold. Notice the injectors are ABOVE the ports? Now look at the heads. Notice the "peak" at the top of the port? That is the "cathedral" shape it got its name from. The injector shoots the fuel down thru the peak into the port.
G Atsma is offline  
Old 01-06-2019, 02:18 AM
Registered User
Thread Starter
Join Date: Jan 2019
Posts: 2

My question was more with the throttle bodies. The Gen 3 tb is an 8 prong and the gen 4 is 6 prong. Is there anyway to put a new throttle body on and it work? Also, is there a 90mm throttle body thatís dbw that will work?
Matthew Kane Powell is offline  
Old 01-06-2019, 08:08 AM
TECH Fanatic
iTrader: (10)
eseibel67's Avatar
Join Date: Feb 2008
Location: Kitchener, ON
Posts: 1,778

I have no info on how intake will physically fit with which engine or TB.

On the electrical side, my guess is 6 of your 8 pins can be wired to a 6-pin connector (Standard S-1745). The 2 extra pins are a +5v supply and ground that the 6-pin TB consolidates. There might be a ready made conversion harness available but Im not sure so you might have to DIY. LS2 TB is 90mm and uses same 6-pin connector as TBSS, but again I dont know how it mounts.
eseibel67 is offline  

Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: