Best LT4 Bolt ons?
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Tha stock LT4 OBD11 is pretty hot as stock.I do know the GM Hot Cam really wakes it up and let's it really breathe along with Long Tube headers.and maybe the Corsa exhaust.. 40-50 HP + gain.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Well... in CA, he can't do the LTs and the Hotcam is questionable. It has a tendency to throw misfire codes, so that would be bad.
I agree with STL94LT1, change gears. That engine is pretty hot from the factory... add a cat back (Corsa is a good choice), high-flow cats never hurt and an open lid air box or some form of intake.
The LT4 is very receptive to upgrades, but they are not "bolt on".
Another trick is to install an Impala SS head gasket. It's thinner.
I agree with STL94LT1, change gears. That engine is pretty hot from the factory... add a cat back (Corsa is a good choice), high-flow cats never hurt and an open lid air box or some form of intake.
The LT4 is very receptive to upgrades, but they are not "bolt on".
Another trick is to install an Impala SS head gasket. It's thinner.
Le Mans Master
Joined: Jul 2000
Posts: 5,012
Likes: 6
From: OKC OK
- K&N filter with open air lid
- Rear end gears in the 3.90 – 4.10 range.
- Get the stock throttle body ported/polished to 52mm. Find/get a air foil port matched with it. Don’t waste your time/money dealing with the Holly or BBK units.
- A good catback exhaust
- Longtube headers
- Computer reprogrammed for the above mods
- Dyno it, just to make sure the air/fuel ratio is correct
- Hurst shifter
- NGK TR55 spark plugs, depending on age/condition good plug wires
- Rear end gears in the 3.90 – 4.10 range.
- Get the stock throttle body ported/polished to 52mm. Find/get a air foil port matched with it. Don’t waste your time/money dealing with the Holly or BBK units.
- A good catback exhaust
- Longtube headers
- Computer reprogrammed for the above mods
- Dyno it, just to make sure the air/fuel ratio is correct
- Hurst shifter
- NGK TR55 spark plugs, depending on age/condition good plug wires
Last edited by LT4POWR; Aug 8, 2005 at 01:23 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
Race Director
Joined: Aug 2003
Posts: 11,043
Likes: 3
From: San Jose Pat Tillman - American Hero
Originally Posted by jedrake72
Good point earlier, I live in CA so headers and most likely cam are out. Stupid CA smog...
