C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Road Race C4

Thread Tools
 
Search this Thread
 
Old Jan 9, 2024 | 07:08 PM
  #21  
*89x2*'s Avatar
*89x2*
Team Owner
25 Year Member
Community Builder
Loved
Community Favorite
 
Joined: May 2001
Posts: 36,189
Likes: 2,511
From: ...tearing up the highways, one state at a time™®©
Default

FWIW, I asked my buddy what he runs at LRP and his time was 59.1. Same car, another driver turned 58.8. This, without the chicane.
Reply
Old Jan 9, 2024 | 07:15 PM
  #22  
MatthewMiller's Avatar
MatthewMiller
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2015
Posts: 6,125
Likes: 2,000
From: St. Charles MO
Default

Originally Posted by icsamerica
1. Will engine go in wth headers attached or will I have to install them from the bottom?
I never tried to pull my engine with headers attached (or at all...I was lucky to fall into a well-built C4 from the PO). Would think the engine will go in with them attached, but I'm not sure. Hopefully someone who knows will chime in. I have installed Hooker 2151s from underneath. It wasn't terrible job except the rearmost bolt on the passenger side is hard as hell to get started and to thread all the way in. The heater box on the firewall is a serious impediment. So if you can do them on the stand, it would be a lot nicer.
2. Wll the pan with the kick out as show work or or is there some interferance issue I need to be concerned with?
It will probably fit. I don't know exactly what pan that is, but the only concern would be if the kickout goes too far foward and hits the subframe crossmember. The pan I used was a Kevko 1091-RR, and it fit fine. As you can see, it had kickouts on both sides, but they were tapered front and rear when looking from above. So it's possible there would be a tight squeeze with yours. I do predict you may not be able to pull the pan without pulling the engine out of the car, just because access to a couple forward bolts on each side may be impossible without the taper. But of course hopefully that's never an issue!
Reply
Old Jan 9, 2024 | 07:53 PM
  #23  
icsamerica's Avatar
icsamerica
Thread Starter
Advanced
All Eyes On Me
Liked
Loved
 
Joined: Jan 2024
Posts: 63
Likes: 26
Default

Originally Posted by *89x2*
FWIW, I asked my buddy what he runs at LRP and his time was 59.1. Same car, another driver turned 58.8. This, without the chicane.
Thanks., gives me hope. A-lot of this is mental. At 59.0 stuff is coming at you fast and VR SIM helps with that tremendously.
Reply
Old Jan 10, 2024 | 12:41 AM
  #24  
Gale Banks 80''s Avatar
Gale Banks 80'
Safety Car
15 Year Member
Photogenic
Photoriffic
Top Answer: 1
 
Joined: Nov 2008
Posts: 3,726
Likes: 558
From: Seattle Washington
Default

Do yourself a favor and do away with the AC Evaporator its not that hard to do and that aft header bolt won't be any big deal. To remove the lower Right Control Arm You need to remove the 45 deg Braces that join the frame to the front Crossmember. But with the right Header installed You can't get to the upper Bolt. Bore a hole in the Brace now before you install the Header.
Reply
Old Jan 15, 2024 | 07:16 PM
  #25  
icsamerica's Avatar
icsamerica
Thread Starter
Advanced
All Eyes On Me
Liked
Loved
 
Joined: Jan 2024
Posts: 63
Likes: 26
Default

Big week ahead. Transmission is ready to come out tonight and new engine in by week's end so long as the bell housing registration is with in 5 thou but I'm shooting for 2.5 thou. The intake needed lots of thread repair, spent a 1./2 a day on that alone.



Last edited by icsamerica; Jan 15, 2024 at 07:25 PM.
Reply
Old Jun 6, 2026 | 06:17 PM
  #26  
icsamerica's Avatar
icsamerica
Thread Starter
Advanced
All Eyes On Me
Liked
Loved
 
Joined: Jan 2024
Posts: 63
Likes: 26
Default

Update...

I had some health setbacks and I'm way behind on the devopement of this car but this year the car felt great out there and it was 2/3's of a rain out so I only got in 2 session all weekend and still improved.

Last year at Limerock was a total rain out. I actualy spun in the rain 80 MPH or so and slid on the grass, after that I was done.

This year I managed a low 1:08, a personal best at LRP for me so a small personal victory there. I'm still way way off my goal of 59.9

Sadly my Go-pro had a SD car error so no video, only memories.

Here are some of the upgrades in the works... If anyone has and input on this I'd appreciate soem suggestions.

1. Convert to speed density. (7730) and 1991 style radiator and air intake setup. I'm pulling 3 inches of vaccuum at WOT with a descreened MAF
2. Northstar DIS conversion
3. 230 / 236 on a 110 LSA mechanical roller.
4. Re-inforcing the front subframe. She's jiggly out there.
5. Oil cooler, I saw oil temps of 242 degrees on a cool day.

Last edited by icsamerica; Jun 6, 2026 at 08:34 PM.
Reply
Old Jun 7, 2026 | 05:04 PM
  #27  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,968
Likes: 710
From: WI
Default

Per the 928 vid it looks like you know what you're doing out there. Would be cool to see the 928 on track. Having tried to capture track vid for a long time any bumps mess up older cameras. Even with sd cards! Try an app with your phone iphone whichever, something like track addict.

The SR engine engine you have is cool! I had a SR combo for awhile they really look nice but it was a little much to work on often in fastener amount. I spent a lot of time porting that one.

A holley hp is a nice easy ecu but it's somewhat costly. CNP and no distributor is nice on it. Crank trigger or holley's dual sync diz.

I personally didn't find an issue with a lot of chassis noodle but I wonder if your suspension is strong enough. I had Z51 springs on and a lot of weight out of the car. Doug Rippie motor sports used to have some revalved shocks.
Reply
Old Jun 7, 2026 | 07:46 PM
  #28  
icsamerica's Avatar
icsamerica
Thread Starter
Advanced
All Eyes On Me
Liked
Loved
 
Joined: Jan 2024
Posts: 63
Likes: 26
Default

Shot of my 2 favorite GM's in the Paddock
Shot of my 2 favorite GM's in the Paddock
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-1

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-2

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-3

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-4

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-5

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-6

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-7

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-8

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-9

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer




All times are GMT -4. The time now is 09:05 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-4
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-5
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-6
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-7
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-8
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-9
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE