Ben16SS

Hey everyone while taking apart my junkyard lq9 I found what appears to be a weld repair in the back of cylinder head. Has anyone seen a repair in this area? Is this common? Should I junk the head or keep it?

The are is at the 1 o'clock position of the freeze plug

NEstyle

iTrader: (1)

It's kind of dirty and hard to tell, but it doesn't look like a weld to me. It looks like someone may have ground on it for some reason with a die grinder or something was rubbing up against it.

Ben16SS

Yeah I think you are right actually at first I was thinking it was a ground down weld but probably not.

blsnelling

iTrader: (4)

Doesn't like a weld at all to me. Either something rubbed on it over the years or it was hit with a grinder of some type.

Ben16SS

So I found a crack repair while taking apart my head's and I would like to know what you guys think about it

G Atsma

I wouldn't worry about it. Looks fine.

01CamaroSSTx

iTrader: (3)

What is the casting number on these heads?

01CamaroSSTx

iTrader: (3)

Probably 035 or 317 which are 71cc heads but if you wanted to make some more power by increasing compression then look for some 243's

00pooterSS

iTrader: (40)

I see a gouge in the head, not a weld

And I don't see a crack in the second pic

Ben16SS

if you look at the 4 o'clock position of the head bolt hole you will see a pin that was put in to stop the crack. it was previously repaired.

Ben16SS

Yeah I was actually thinking about doing that but around here we only have access to 91 octane and i'm worried about 11:1CR with 91 octane. Do you think it would be ok?

Ls7colorado

iTrader: (3)

I still dont see it, looks more like an impression from the headgasket or something else rubbing on it.

00pooterSS

iTrader: (40)

Don't see a pin at 4 oclock and they wouldn't put a pin in to stop a crack so I have no idea

Maybe circle the area so we can focus in better on exactly what you're talking about

NEstyle

iTrader: (1)

Dude, no offense, but you're waaay paranoid. Look at this. That little gray dot is exactly where you see your "pin".

Ben16SS

I had a head pinned to fix a crack before although it was cast iron not aluminum. Either way it looks like I'm tripping.

Ben16SS

Haha no offense taken I overthink allot. And I was obviously way overthinking this one. thanks for the pic I didn't even think to look at my head gasket in that spot.

00pooterSS

iTrader: (40)

The biggest issue here is you're looking at a dirty *** head with markings all over it and assuming that stuff is pins/cracks etc when it's just dirt/grime/transfer marks

Clean the surface really good. You're judging all the dirty spots and crap on it.

Ben16SS

Yeah you're not wrong I just jumped to a false conclusion. Any advice on cleaningd/degreasing
​​​​parts at home?

dreadpirateroberts

iTrader: (1)

Take it to a shop, have them mill and recut the valve seats and a reface on the valve, and have them ultrasonic clean the head if they can. Maybe they can mill or at least clean up the other mating surfaces.

Good as new.

matts01z71

I use spray cans of coil cleaner for A/C units for at home cleaning of aluminum parts, let it set on a while. If you have a shallow bucket, pan or something to let it collect in and then a variety of scrub brushes, tooth brush. I agree, at a minimum, hot tank, valve job and a few thou mill to clean the mating surface.