"87 TPI vs. "89 TPI
Thread Starter
Burning Brakes
Joined: Oct 2005
Posts: 866
Likes: 4
From: Iowa
"87 TPI vs. "89 TPI
Is the intake manifold, plenum and the tubes - the same on the 87's and the 89's?
I have a friend who has a set off a 1987 L98 --------- I own a 1989 L98. If the 89 and 87 will swap - I want to do some polishing and detailing work to the 87 TPI and then when finished swap them onto mine, so I would have very little downtime for driving.
Will there be any problems I might run into?
I have a friend who has a set off a 1987 L98 --------- I own a 1989 L98. If the 89 and 87 will swap - I want to do some polishing and detailing work to the 87 TPI and then when finished swap them onto mine, so I would have very little downtime for driving.
Will there be any problems I might run into?
Thread Starter
Burning Brakes
Joined: Oct 2005
Posts: 866
Likes: 4
From: Iowa
Originally Posted by C-4 Now
Most parts on 89 are differant because it is the first year for no cold start injector. 
Sorry for bad news. 
Sorry for bad news. 
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
As complete units they interchange , if you are not worried about the cold start.
However the later manifolds don't have the idle air passages (see hole behind TB on '87 plenum)
so early plenum / runners will work on late base but not the other way around as no idle air ports on late setup.
(Tube on runner drivers side missing on '89 runner.)
However the later manifolds don't have the idle air passages (see hole behind TB on '87 plenum)
so early plenum / runners will work on late base but not the other way around as no idle air ports on late setup.
(Tube on runner drivers side missing on '89 runner.)
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Reconditioned was about $100 at Speed and Performance - www.hotrodlane.cc. I bought some about 4 years ago and they look new. For more bucks, you can have them polished or chrome.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Originally Posted by countylawdog
Is the intake manifold, plenum and the tubes - the same on the 87's and the 89's?
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
Originally Posted by JrRifleCoach
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
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Originally Posted by cplonner
I have 24 lb injectors on my engine (heads cam intake exhaust). It says on engine with 300 + hp you should use 24.9, could this cause power loss if not?
Just DO IT
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
I had it tuned and i took it to the dyno and the power was low, alot lower than expected. I mailed alvin my dyno and he said there wasnt much that could be done, he said the dyno looked smooth.
