6.2 blown !

Reply Subscribe

Thread Tools

Search this Thread

Apr 26, 2018 | 07:14 PM

#21

bigsapper

Drifting

Joined: Feb 2001

Posts: 1,768

Likes: 297

From: Plano TX

^^^^ I can't imagine a shop using the stock valve springs with a H/C package, but who knows?

Apr 26, 2018 | 09:31 PM

#22

brettmess24

Racer

Joined: May 2016

Posts: 310

Likes: 45

Wow! Looks like the rod snapped!

Apr 26, 2018 | 11:08 PM

#23

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

2015

Quote:

Originally Posted by Joe@CPR

what year are you? i have seen 3 local 14's break stock valve springs and drop valve. 1 was a bolt on car, 2 were 100% stock. 15+ lt1's have blue springs were 14's are yellow.

The Corvette is a 2015, here's a couple pictures of the top of the head...

Apr 26, 2018 | 11:19 PM

#24

Cordes Performance Racing

Supporting Vendor

Joined: Feb 2009

Posts: 4,420

Likes: 1,428

From: Mesa Az

Quote:

Originally Posted by bigsapper

^^^^ I can't imagine a shop using the stock valve springs with a H/C package, but who knows?

shoot i didn't read heads/cam car too. i just saw blower doh!

__________________
Cordes Performance Racing aka "CPR"
Owner of AZ's premier LSX/LTX motorsports shop
http://cordesperformanceracing.com/
www.facebook.com/cordesperformanceracing.com
joe@cordesperformanceracing.com
480-359-5914

Apr 26, 2018 | 11:23 PM

#25

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

There's no blower on the car. I just had the ported heads & cam work done .

Apr 26, 2018 | 11:26 PM

#26

Kingtal0n

Safety Car

Joined: Oct 2007

Posts: 4,204

Likes: 1,075

From: South Florida

You may find this interesting.

This is a factory longblock 6.0L Engine in a Colorado.

So it is very painful to see any 5-6L engine let go around half of the power that one of these OEM motors can do with a turbo.

Apr 27, 2018 | 07:32 AM

#27

bigsapper

Drifting

Joined: Feb 2001

Posts: 1,768

Likes: 297

From: Plano TX

Wow, I've never seen rocker arm bosses beat like that. Valve spring bind? What was the lift on the cam?

Apr 27, 2018 | 08:34 AM

#28

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

Here's the numbers on the cam, I thought they looked odd

Last edited by 6.2Blown; Apr 27, 2018 at 09:08 AM.

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

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

Michael S. Palmer

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

Joe Kucinski

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

Joe Kucinski

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

Verdad Gallardo

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

Joe Kucinski

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

Verdad Gallardo

Top 10 Corvettes Coming to Mecum Indy 2026!

Brett Foote

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

Michael S. Palmer

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

Joe Kucinski

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

Michael S. Palmer

Apr 27, 2018 | 11:49 AM

#29

robert miller

Team Owner

Joined: Jan 2007

Posts: 29,063

Likes: 1,839

From: cookeville tennessee

Quote:

Originally Posted by 6.2Blown

Here's the numbers on the cam, I thought they looked odd

That cam had a good sound for sure to it. Numbers look ok on it what vendor did you get it from.

Apr 28, 2018 | 01:58 AM

#30

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

Is it just me or do these just not look right ?

Apr 28, 2018 | 04:17 PM

#31

FYREANT

I'm Batman..

Joined: Apr 2014

Posts: 6,142

Likes: 921

From: Lehigh Acres FL

Tech Contributor

Quote:

Originally Posted by 6.2Blown

Here's the numbers on the cam, I thought they looked odd

I run a cam very similar to those specs.

Quote:

Originally Posted by 6.2Blown

Is it just me or do these just not look right ?

Those look fine. They are offset because one is for exhaust and one is for intake for each cylinder and they are not the same size.

A lot of smart people in this thread already so you have the attention of the right crowd. Lets get down to a few details first -

- Did you do the cam and heads and re-use stock valve springs and retainers and pushrods?

- Did the shop measure installed height of the pushrods?

- Who tuned the car, and what experience do they have?

Shops that say “yea we’ve been tuning LS motors for years!” Blow up a lot of LT motors because the DI LT motors are wayyyy different on tuning then the LS motors were.

Ant

Last edited by FYREANT; Apr 28, 2018 at 04:17 PM.

Apr 28, 2018 | 06:58 PM

#32

robert miller

Team Owner

Joined: Jan 2007

Posts: 29,063

Likes: 1,839

From: cookeville tennessee

ttt

^^^ I agree it is like Ant is telling you those are off set due the head design to get more out of on air flow. One for the intake & one for the exhaust port .

Some I still say is wrong or set up not correct on that #8 hole in the head. Also more than not in the tune also.Robert

Apr 28, 2018 | 07:04 PM

#33

JHEBERT

Drifting

Joined: Apr 2015

Posts: 1,276

Likes: 317

I would like to see the valve spring retainer and valve locks for that valve.

Apr 28, 2018 | 09:54 PM

#34

brettmess24

Racer

Joined: May 2016

Posts: 310

Likes: 45

Looks really similar to what happened to my Ducati 748, set the squish to tight and dropped a valve, Melted right into the piston!

What are your plans for the car now?

Apr 28, 2018 | 11:46 PM

#35

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

Thanks for the information everyone!
All of the work got done at a local known shop so I can't truly say what did get done

Last edited by 6.2Blown; Apr 29, 2018 at 01:35 PM. Reason: Spelling....

Apr 29, 2018 | 12:17 AM

#36

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

Quote:

Originally Posted by JHEBERT

I would like to see the valve spring retainer and valve locks for that valve.

Trust me , I'll be looking for them ...

Apr 29, 2018 | 03:09 PM

#37

Gearhead Jim

Team Owner

Joined: Sep 2000

Posts: 25,004

Likes: 2,706

From: Far NW 'burbs of Chicago

St. Jude Donor '13

Quote:

Originally Posted by Cowboy26a

I got lucky when a valve turned loose in my 68 Camaro with a big block in it. No damage to the block.

Now an expensive paper weight.

That's the ultimate interference engine!

Apr 29, 2018 | 10:47 PM

#38

JHEBERT

Drifting

Joined: Apr 2015

Posts: 1,276

Likes: 317

Quote:

Originally Posted by 6.2Blown

Trust me , I'll be looking for them ...

That’s going to tell you if it was bad luck/components or if it was an ******* with a ratchet. And I’m being nice. Sucks you’re dealing with this..

May 1, 2018 | 12:40 AM

#39

6.2Blown

Thread Starter

Instructor

Joined: Mar 2015

Posts: 135

Likes: 28

From: Unanimous

Quote:

Originally Posted by brettmess24

Looks really similar to what happened to my Ducati 748, set the squish to tight and dropped a valve, Melted right into the piston!

What are your plans for the car now?

Bigger, better,badder.... I'll post it when it gets done ...

May 1, 2018 | 11:01 AM

#40

Internets_Ninja

Safety Car

Joined: Mar 2004

Posts: 4,048

Likes: 1,476

From: South Florida

That's def a dropped valve. I'd suspect mechanical malfunction rather than a tuning issue. Could have been an issue with the head work or you could have broken a valve spring. One is the machine shops fault, the other could have been a bad spring/retainer assembly.

Reply Share

First
Prev
2 / 3
Next
Last

Forum Jump