C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Does this sound stock?

Thread Tools
 
Search this Thread
 
Old Aug 21, 2023 | 09:17 AM
  #1  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default Does this sound stock?

I'm curious to know if this 74' sounds stock?
This is with just long tube headers, and not tuned yet.. but a couple of people were wondering if it
had a non-original cam..
How does this sound to you?

Reply
Old Aug 21, 2023 | 09:21 AM
  #2  
taint's Avatar
taint
Instructor
 
Joined: Jan 2019
Posts: 145
Likes: 98
From: Central Kentucky
Default

I wonder this myself. My '75 L82 seems to hit a pretty nice lick, as well. Nothing about it makes me think someone cracked it open to put a cam in it. I have long tube headers and have set timing and idle.
Reply
Old Aug 21, 2023 | 09:28 AM
  #3  
Bikespace's Avatar
Bikespace
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Mar 2017
Posts: 11,931
Likes: 4,497
From: Virginia
Default

Sounds good!

Your alternator is really dancing. You may want to check your motor mounts.
Reply
Old Aug 21, 2023 | 09:32 AM
  #4  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by Bikespace
Sounds good!

Your alternator is really dancing. You may want to check your motor mounts.
yeah, noticed that!
Reply
Old Aug 21, 2023 | 09:30 PM
  #5  
210ken's Avatar
210ken
Pro
15 Year Member
All Eyes On Me
Community Favorite
Top Answer: 3
 
Joined: Aug 2010
Posts: 648
Likes: 452
From: Napa, CA
Default

Is the vacuum advance disconnected?
Reply
Old Aug 22, 2023 | 07:43 AM
  #6  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by 210ken
Is the vacuum advance disconnected?
I'll doubleheck..
thx,
R
Reply
Old Aug 22, 2023 | 09:28 AM
  #7  
randallsteel's Avatar
randallsteel
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Dec 2017
Posts: 1,043
Likes: 414
2023 C3 of the Year Finalist - Modified
Default

Sounds pretty stock, but hard to say.
what rpm was it idling at?
Does it look like the timing chain cover has been replaced before?
Reply
Old Aug 22, 2023 | 09:30 AM
  #8  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by randallsteel
Sounds pretty stock, but hard to say.
what rpm was it idling at?
Does it look like the timing chain cover has been replaced before?
sadly, the distro was replaced by someone who didn;t think a tach was necessary...
haven't actually looked at the TC cover, but I'll try to soon

thanks,.
R
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

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

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-3

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Aug 22, 2023 | 01:14 PM
  #9  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

These pics are pretty big, but thought maybe they'd help to show the current configuration..
Does anything look really amiss to you?
(aside from the fuel line)





Reply
Old Aug 22, 2023 | 01:28 PM
  #10  
pspicci's Avatar
pspicci
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Apr 2020
Posts: 788
Likes: 418
From: Western NY
Default

The first picture it looks to me like your metal fuel line just before the carb is crushed. i would replace that asap. second pic looks like there is no wire hooked up to the temp sending unit.

Pat
Reply
Old Aug 22, 2023 | 01:38 PM
  #11  
Rescue Rogers's Avatar
Rescue Rogers
Is my vette stock?? HAHA
Supporting Lifetime Gold
Veteran: Navy
10 Year Member
Community Builder
Loved
 
Joined: Oct 2015
Posts: 20,174
Likes: 9,305
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Default

Does your headlights ooen and close. You have an open vacuum line near you brake master. It doesnt sound like its idling like a big cam, just sounds like a bad idle
Reply
Old Aug 22, 2023 | 01:38 PM
  #12  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by pspicci
The first picture it looks to me like your metal fuel line just before the carb is crushed. i would replace that asap. second pic looks like there is no wire hooked up to the temp sending unit.

Pat
does this look right?
Fuel line
Reply
Old Aug 22, 2023 | 01:41 PM
  #13  
Jebbysan's Avatar
Jebbysan
Dr. Detroit
Supporting Member
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Default

To me it sounds like it runs like it is running very poorly and like 7 cylinders.......
Get it tuned....start with timing first.

Jebby
Reply
Old Aug 22, 2023 | 01:43 PM
  #14  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by Rescue Rogers
Does your headlights ooen and close. You have an open vacuum line near you brake master. It doesnt sound like its idling like a big cam, just sounds like a bad idle
Honestly,. I haven't even started messing with headlight system yet..

It also occurs to me that I took apart the center console, and I have that round bundle of hoses that goes to the heater/ac control, just hanging out in mid-air... is that a vacuum leak?
Reply
Old Aug 22, 2023 | 01:44 PM
  #15  
rgouette's Avatar
rgouette
Thread Starter
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 409
Likes: 46
From: Auburn Maine
Default

Originally Posted by Jebbysan
To me it sounds like it runs like it is running very poorly and like 7 cylinders.......
Get it tuned....start with timing first.

Jebby
To be fair, I haven't touched timing yet.. you're probably onto something there.
thx
Reply
Old Aug 22, 2023 | 02:00 PM
  #16  
pspicci's Avatar
pspicci
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Apr 2020
Posts: 788
Likes: 418
From: Western NY
Default

Originally Posted by rgouette
does this look right?
Fuel line
hard to say it kinda looks more like a big block line. just make sure it's for a small block. the description does not say. you might want to check with one of the corvette vendors they list the fuel line as 70-76 350.

Pat
Reply
Old Aug 22, 2023 | 02:01 PM
  #17  
Tampa Jerry's Avatar
Tampa Jerry
Le Mans Master
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Top Answer: 1
 
Joined: Aug 2005
Posts: 6,529
Likes: 1,961
From: Temple Terrace Florida
Default

It could be a wild cam or an engine in need of a complete tuning or even a stuck or dead valve as the result of a wiped cam. Tune it up including timing and put a vacuum gauge on it. Jerry
Reply

Get notified of new replies

To Does this sound stock?

Old Aug 22, 2023 | 02:21 PM
  #18  
pspicci's Avatar
pspicci
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Apr 2020
Posts: 788
Likes: 418
From: Western NY
Default

Originally Posted by rgouette
Honestly,. I haven't even started messing with headlight system yet..

It also occurs to me that I took apart the center console, and I have that round bundle of hoses that goes to the heater/ac control, just hanging out in mid-air... is that a vacuum leak?
Probably. easy to find out. next time youi start it just see if any air is being sucked through those lines. if yes then you have a vacuum leak. plug them all with golf tees before you start doing your tuning.

Pat
Reply
Old Aug 22, 2023 | 03:39 PM
  #19  
Rescue Rogers's Avatar
Rescue Rogers
Is my vette stock?? HAHA
Supporting Lifetime Gold
Veteran: Navy
10 Year Member
Community Builder
Loved
 
Joined: Oct 2015
Posts: 20,174
Likes: 9,305
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Default

You could just unplug the vacuum lines just behind the carb on that post and cap the ports on the post
Reply
Old Aug 23, 2023 | 06:35 AM
  #20  
BKarol's Avatar
BKarol
Melting Slicks
Veteran: Army
20 Year Member
Liked
Community Favorite
 
Joined: Sep 2004
Posts: 3,223
Likes: 666
From: Northeast
Default

Accelerator pump rod should be in the back hole. Just push the pin far enough to release the arm, if you push it too far it will be difficult to push back in place. Insert a flat feeler gauge on the other side so as to have some room to push the pin back after the switch..

Reply



All times are GMT -4. The time now is 01:03 AM.

story-0
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
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE