6.2 blown !

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Apr 26, 2018 | 07:14 PM

#21

bigsapper

Drifting

Joined: Feb 2001

Posts: 1,768

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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

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Posts: 310

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Wow! Looks like the rod snapped!

Apr 26, 2018 | 11:08 PM

#23

6.2Blown

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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

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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"
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Apr 26, 2018 | 11:23 PM

#25

6.2Blown

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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: 4,230

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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

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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

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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.

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Apr 27, 2018 | 11:49 AM

#29

robert miller

Team Owner

Joined: Jan 2007

Posts: 29,065

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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

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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: 6,143

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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: 29,065

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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

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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

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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

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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

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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

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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

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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

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Joined: Mar 2015

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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

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Joined: Mar 2004

Posts: 4,048

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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.

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