C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

1978 need help with parts recognition

Thread Tools
 
Search this Thread
 
Old Aug 20, 2013 | 12:34 PM
  #1  
Machina15's Avatar
Machina15
Thread Starter
Cruising
 
Joined: Aug 2013
Posts: 10
Likes: 0
Default 1978 need help with parts recognition

Hello, I have bit of a problem, with custom parts that have been installed by previous owner. Long story short, 3 weeks ago I bought 78 C3, and now it's somewhere in the middle of Atlantic Ocean.

Thing is, I don't know what parts might have been put in that car (besides new exhaust headers). Thanks to forum, I know at least this car should have L48 engine, but I can't tell if this is factory engine (shouldn't engine block be blue?). Other than that I don't know anything about what's inside. It's heck of annoying if you don't know what's inside of your car.

BTW is there a way to tell a diffrence (without dyno, or driving) from 383 stroker or L48?

Reply
Old Aug 20, 2013 | 01:06 PM
  #2  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

I'll tell you very honestly that I don't see one engine component or accessory that is stock. No way of telling what you've got unless you disassemble it.

I'd be concerned about an immediate overheating problem given that the radiator shroud is missing and someone has downgraded the car with a flex fan.
Reply
Old Aug 20, 2013 | 01:18 PM
  #3  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
Default

Originally Posted by Machina15
......
Stock 79 L-48 below; 78 would be nearly identical.


Reply
Old Aug 20, 2013 | 01:25 PM
  #4  
Roco71's Avatar
Roco71
Melting Slicks
 
Joined: Jul 2009
Posts: 3,264
Likes: 3
From: Vero Beach FL
Default

Wow... don't ya just love hot rodding
Reply
Old Aug 21, 2013 | 04:18 AM
  #5  
Machina15's Avatar
Machina15
Thread Starter
Cruising
 
Joined: Aug 2013
Posts: 10
Likes: 0
Default

Thx for the advice about heating. So looks like I will have to disassamble it (trip to dyno would be needed too).
Reply
Old Aug 21, 2013 | 07:01 AM
  #6  
TedH's Avatar
TedH
Le Mans Master
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 1999
Posts: 8,351
Likes: 75
From: Tampa Bay FL
Default

You can see the engine pad just forward of the passenger side cylinder head. Clean the (rust?) from the surface and compare it to the number on the driver's door pillar. If it matches, original block at least.

I'd address the spark plug wires/routing. there is nothing keeping them off of the headers.
Reply
Old Aug 21, 2013 | 10:22 AM
  #7  
Ely's Avatar
Ely
Advanced
10 Year Member
 
Joined: Jun 2013
Posts: 64
Likes: 1
From: Lambertville Michigan
Default

EZ Mike
Your stock pic. of the '79 L48 has (2) air intakes to the air filter.
I thought that was an indication of the L82.
Reply
Old Aug 21, 2013 | 10:47 AM
  #8  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
Default

Originally Posted by Ely
EZ Mike
Your stock pic. of the '79 L48 has (2) air intakes to the air filter.
I thought that was an indication of the L82.
Might be true for 78 L-82 but there's no real indication the OP's car is/was an L-82.

Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

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

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

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

 Michael S. Palmer
story-7

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

 Joe Kucinski
story-8

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

 Joe Kucinski
story-9

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

 Verdad Gallardo
Old Aug 21, 2013 | 12:09 PM
  #9  
Crash80's Avatar
Crash80
Drifting
20 Year Member
 
Joined: Apr 2003
Posts: 1,323
Likes: 2
From: Castle Hills Texas
Default

Originally Posted by Ely
EZ Mike
Your stock pic. of the '79 L48 has (2) air intakes to the air filter.
I thought that was an indication of the L82.
My 80 L-48 has two intakes to the air filter. I think the 78 was the same, no matter which engine was in there.
Reply
Old Aug 21, 2013 | 12:49 PM
  #10  
Rich's'78's Avatar
Rich's'78
Racer
 
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
Default

Originally Posted by Crash80
My 80 L-48 has two intakes to the air filter. I think the 78 was the same, no matter which engine was in there.
My original '78 L-48 had a single snorkel. I thought only the L-82s had the dual snorkels.
Reply
Old Aug 21, 2013 | 01:19 PM
  #11  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
Default

Originally Posted by Rich's'78
...My original '78 L-48 had a single snorkel...
I thought so, but wasn't certain. IIRC, they went to dual snorkels for all engines beginning with the 79s and added 10hp to the L-48 numbers (real or imagined) as part of the hype.

Reply
Old Aug 21, 2013 | 02:47 PM
  #12  
BKarol's Avatar
BKarol
Melting Slicks
Veteran: Army
20 Year Member
Liked
Community Favorite
 
Joined: Sep 2004
Posts: 3,227
Likes: 670
From: Northeast
Default

Originally Posted by Rich's'78
My original '78 L-48 had a single snorkel. I thought only the L-82s had the dual snorkels.
This is correct in 1978. Dual for L82 and one for L48

Original engine from the factory was painted blue.

Off the stamp pad that tedh mentions, the suffix on the top line will tell you what the block was. Under will be the partial vin.

Internals could have been changed. Without taking it apart you will never know.
Reply
Old Aug 21, 2013 | 03:08 PM
  #13  
Machina15's Avatar
Machina15
Thread Starter
Cruising
 
Joined: Aug 2013
Posts: 10
Likes: 0
Default

So with German custom, I will go with cc350. As soon as I get my hand on the car(about a week or so), I'm gonna check about block itself.

I have one more question( I saw it's very delicate matter ), what engine oil I should use? Also I should say that it's very hard to get oils that are used in US (I have really hard time finding mopar 5w20 to my wrangler - there are maybe 2 shops in my hometown that have it).

I also saw Royal Purple - is it better than mopar oil?
Reply
Old Aug 22, 2013 | 05:06 PM
  #14  
BKarol's Avatar
BKarol
Melting Slicks
Veteran: Army
20 Year Member
Liked
Community Favorite
 
Joined: Sep 2004
Posts: 3,227
Likes: 670
From: Northeast
Default

Just a FYI. Noticed this in the 1978 Chassis service manual and the owners manual:

NOTE: SAE 5w-20w oils are not recommended for sustained high-speed driving.

I would suggest asking the seller what he had been using and continue to use a quality oil. The sticky at the top of the page will give you some brand names.

I do not remember Mopar Oil being discussed on this forum. Good luck.
Reply
Old Aug 23, 2013 | 08:56 AM
  #15  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
Default

MoPar and Royal Purple are trade names. Royal Purple is synthetic; not sure whether the Mopar is synthetic or dino.

To be honest, oil use for you will depend on what you can obtain locally. I would think your local auto parts store would have something available off the shelf comparable to anything you could purchase elsewhere.

Reply
Old Aug 23, 2013 | 01:09 PM
  #16  
Crash80's Avatar
Crash80
Drifting
20 Year Member
 
Joined: Apr 2003
Posts: 1,323
Likes: 2
From: Castle Hills Texas
Default

Originally Posted by Rich's'78
My original '78 L-48 had a single snorkel. I thought only the L-82s had the dual snorkels.
My bad.
Reply

Get notified of new replies

To 1978 need help with parts recognition





All times are GMT -4. The time now is 08:15 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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