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

12558062 Vortec heads

Thread Tools
 
Search this Thread
 
Old Jul 2, 2022 | 05:12 PM
  #1  
Fatpig's Avatar
Fatpig
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Sep 2020
Posts: 90
Likes: 13
Default 12558062 Vortec heads

Will 12558062 heads bolt up to my 1976 l48 350? My research so far says they will. I am following up here as the next step. Any clearance issues with the intake and carb? Stick with the qjet or go with edelbrock? Thanks.
Reply
Old Jul 2, 2022 | 06:25 PM
  #2  
Shark Racer's Avatar
Shark Racer
Race Director
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Default

Originally Posted by Fatpig
Will 12558062 heads bolt up to my 1976 l48 350? My research so far says they will. I am following up here as the next step. Any clearance issues with the intake and carb? Stick with the qjet or go with edelbrock? Thanks.
Yes, they should bolt up. You’ll need a Vortec specific intake. This may cause hood clearance issues, requiring you to switch to a low rise air cleaner.

Assuming your Q-Jet hasn’t been hacked by someone along the way, I would stick with the QuadraJet. The 1976 QuadraJet has over a decade of engineering refinement added to it vs the Edelbrock.
Reply
Old Jul 2, 2022 | 06:46 PM
  #3  
Jarhead 74 Vette's Avatar
Jarhead 74 Vette
Pro
Veteran: Marine Corps
Liked
Loved
Community Favorite
 
Joined: Oct 2020
Posts: 646
Likes: 295
From: Blairsville, Ga
Default

Like Shark Racer said, yes, they will bolt right up, but you will need a Vortec specific intake.

I wanted to run an RPM Air Gap intake on my 74, but ended up buying an Edelbrock Performer EPM intake for my crate 357. I have yet to install it, but hoping for the best.
The EPM shows pretty decent numbers for a “low rise” intake, and are nearly an inch shorter than the Air Gap (if memory serves me right).

There are mixed feelings between QJet, Edelbrock and Holley. Personally, I like Holley carbs as they’re simpler to tune, but I hear that once you get a QJet dialed in, it’s there and runs GREAT!

Best of luck!!

Greg
Reply
Old Jul 2, 2022 | 10:26 PM
  #4  
BKbroiler's Avatar
BKbroiler
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2002
Posts: 5,086
Likes: 786
From: Lebanon Township New Jersey
Default

You will also need self aligning rocker arms with the Vortec heads. They don't have push rod guide plates.
Reply
Old Jul 3, 2022 | 12:20 PM
  #5  
Fatpig's Avatar
Fatpig
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Sep 2020
Posts: 90
Likes: 13
Default

Thanks to the guys who responded with good info. I was able to purchase these 062 Vortec heads for $200. They are able to handle .500 lift and have Z28 springs. Magnafluxed and cleaned.
Reply
Old Jul 3, 2022 | 11:10 PM
  #6  
Jarhead 74 Vette's Avatar
Jarhead 74 Vette
Pro
Veteran: Marine Corps
Liked
Loved
Community Favorite
 
Joined: Oct 2020
Posts: 646
Likes: 295
From: Blairsville, Ga
Default

Great price for complete Vortec heads in good running condition!
Reply
Old Jul 4, 2022 | 07:33 AM
  #7  
BKbroiler's Avatar
BKbroiler
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2002
Posts: 5,086
Likes: 786
From: Lebanon Township New Jersey
Default

You might want to consider changing to screw in studs. Relatively cheap and easy.
Reply
Old Jul 4, 2022 | 07:36 AM
  #8  
Fatpig's Avatar
Fatpig
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Sep 2020
Posts: 90
Likes: 13
Default

Originally Posted by BKbroiler
You might want to consider changing to screw in studs. Relatively cheap and easy.
Thanks for the info. What are the advantages of doing that?
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 Jul 4, 2022 | 07:44 AM
  #9  
Fatpig's Avatar
Fatpig
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Sep 2020
Posts: 90
Likes: 13
Default

[QUOTE=Fatpig;1605359836]Thanks for the info. I found a really good video on youtube that explained to me why this is a god idea. I am definitely going to do this. https://m.youtube.com/watch?v=ejih8y7wli4#menu
Reply

Get notified of new replies

To 12558062 Vortec heads





All times are GMT -4. The time now is 12:37 PM.

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