01ssreda4

iTrader: (96)

I thought the same thing.

sepsis

iTrader: (7)

How did the valve guide get from one head to the other?

01ssreda4

iTrader: (96)

Edited the title for you Merv.....no reason to drag Patriot's name through the mud when it wasn't their spring.

trans_am7935

iTrader: (15)

here is probobly what happened

Spring snapped
pushrod pushes down on intake rocker
rocker destroyed valve guide due to no spring load
intake valve no longer closes and acts like an exhaust valve
contents go into the intake manifold
next cylinder that opens an intake valve to suck in air sucks in the valve guide
compression of cylinder #8 takes what is left of the guide and digs into the head

sepsis

iTrader: (7)

I kind of figured that, but it just seems odd that it could make it's way back through the intake and up into the other runner like that.

trans_am7935

iTrader: (15)

yea the motor runs under alot of pressure, and most of the valve guide on the broken cylinder probably didn't make its way into the cylinder, and with the intake valve just sitting there, the down stroke of piston #8 and the upstroke of the damaged piston, it just worked out that way. pretty amazing if you think about it, just in a shitty situation.

wildcamaro

iTrader: (15)

these motors are amazing, my buddys car dropped an intake valve and shot it out into the header and dented it outwards!!! like a bullet!

the_merv

iTrader: (88)

The firing order is 1-8-7-2-6-5-4-3. Since it broke on #3 it probably floated the Valve open for a split second and shot the fragments up through the Intake Runner, then they sat flat on the plenum and by the time #8 rolled around it sucked them right into it. I have a Vic Jr on this car, so it wasnt hard for that to happen. Polymer Intake wouldbve been a little different. There were small fragments in #1, that's what lead me to pull the other Head and check. I called Mike at TEA and told him what I found and what I thought, he said to pull both and send them his way.

Fortunately it's not too hard to yank them off..Gbody FTW..Cam is a 243/247, .621/.612, 114+3LSA.

I've seen springs made..wouldnt suprise me if a bad one comes out every now n then..prob why the warranty exists, nothing is perfect.

Thanks..wasnt trying to drag anyone down..just stating what I thought it was. I'm not really blaming anyone, just want it back up and running.

ZeeOSix

Which PAC part number where those springs? Did you contact PAC to see if there were any more reports ... possible bad batch?

Any chance the valve guide let go first (cracked during installation?) and caused the chain reaction?

Just goes to show that dual valve springs won't totally prevent engine damage if the outer spring fails.

the_merv

iTrader: (88)

TEA is the one that built the Heads so I was advised to send them to them and let them do the legwork..still under their warranty.

I would say this is better than dropping a Valve..this is minor damage that can be very easily cleaned on the Shortblock.

vettenuts

iTrader: (4)

How do you know the guide didn't fail first? Looks like a powder metal guide.

To the OP, when fully open where is the rocker tip located in relation to the top of the valve stem?

laytoncamaroz28

iTrader: (10)

The same thing happened to My buddy's truck. I replaced both l92 heads. What kinda heads are yours. Here's a link to my thread. https://ls1tech.com/forums/generatio...e-springs.html

the_merv

iTrader: (88)

Rocker sweep is in the middle where it should be. That #3 Intake Rocker is tore up tho, need a new one.

I thought these were Stainless Guides..hmm.

the_merv

iTrader: (88)

Mine are L92 Heads from 2007..I've had them for that long.
Look just the same as the pics in that thread. I'll have to talk to Mike at TEA and tell him that the Guides probably have to be upgraded, more than likely ill need new Heads, still debating the bottom-end if I want to pull it and replace that one Piston. Before this failure I had a flawless 16k mile Engine.

TurboBuick6

iTrader: (2)

Do you have any better pictures of the spring by chance? Looking at the inner that does not look like a PAC spring. Any pics of the spring ends? Im 99% sure that is not a PAC spring.

the_merv

iTrader: (88)

What do you want pics of on it? It's flat like every other one that I have seen, have Trick Flow part numbers on the invoice.

TurboBuick6

iTrader: (2)

Pictures of the spring ends. Spring maufatures have suttle differences in the ends of the springs. A TFS part# would be great too.

the_merv

iTrader: (88)

I have it all boxed up and ready to go back to them.

Here is their part number: TFS-TVS1732

samckitt

iTrader: (5)

I did not read this whole thread end to end. How many cylinders do you have problems with? Looks like pistons from cylinders 1,3, & 8 have marks from something. How many springs broke & what the damage to the other cylinders?

You saying the guide from cylinder #3 ended up in cylinder #8?

TurboBuick6

iTrader: (2)

That is our spring. It has been a great spring really this is the only issue I have heard with it. Hopefully we will see it too so we can throw it under the microscope to see why and where it initially failed.