L-98 Throttle Body Hoses?
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
L-98 Throttle Body Hoses?
I have an L-98 in my 71 and am confused about the hoses on the throttle body.
Will someone please tell me what hose is supposed to be connected to each of the three ports on the passenger side and to the single port on the lower front of the throttle body?
Thanks.
Will someone please tell me what hose is supposed to be connected to each of the three ports on the passenger side and to the single port on the lower front of the throttle body?
Thanks.
Le Mans Master
Joined: Jan 2002
Posts: 5,320
Likes: 4
From: Kyle TX (Because Mojo Made me fill it in)
Re: L-98 Throttle Body Hoses? (flynhi)
I can bring my 86 service manual for you to look at if that will help on what goes to those fittings. BTW, those wires works great, thanks!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: L-98 Throttle Body Hoses? (flynhi)
Get two large vacuum nipples at Auto Zone and plug the two large fittings, the one on the left side and the largest one of the right side. These are coolant fittings and when coolant flows throught them only serve to heat the incomming air. Then just run the heater hose under the TPS into the water pump fitting.
This "mod" is called the TB coolant bypass and is performed by a lot of us to aid in keeping intake air as cool as possible.
The smallest fitting on the right connects from a vacuum line that comes across from the left fender well. The medium fitting accepts a hose that connects to the breather in the right valve cover. There is a small fitting under the front of the TB that connects to a small vacuum hose.
This "mod" is called the TB coolant bypass and is performed by a lot of us to aid in keeping intake air as cool as possible.
The smallest fitting on the right connects from a vacuum line that comes across from the left fender well. The medium fitting accepts a hose that connects to the breather in the right valve cover. There is a small fitting under the front of the TB that connects to a small vacuum hose.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Re: L-98 Throttle Body Hoses? (65Z01)
65ZO1
What does the small vac hose connect to?
I understand the coolant bypass idea. On my 90 Speed Density TB, I think the coolant connections are top passenger side and lower front.
Understand the breather connection.
Any other tips?
What does the small vac hose connect to?
I understand the coolant bypass idea. On my 90 Speed Density TB, I think the coolant connections are top passenger side and lower front.
Understand the breather connection.
Any other tips?
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Re: L-98 Throttle Body Hoses? (flynhi)
What does the small vac hose connect to?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jan 2002
Posts: 5,320
Likes: 4
From: Kyle TX (Because Mojo Made me fill it in)
Re: L-98 Throttle Body Hoses? (flynhi)
Ive got my manual with me at work today if you still need it. Give me a call if you want to swing by and take a look or pic.
