Cracked Heads [Archive] - GrandAmGT.com Forum

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eric99gt
06-19-2005, 04:45 PM
What can cause this. I've recently had this happen to me and was stumped as to how it happened. Any info?

boost21
06-19-2005, 04:50 PM
only thing i can think of is at a cold start you revved tour engine and it warmed up too quickly
0.02

SilverGAGT04
06-19-2005, 07:22 PM
Do you got a pic of the cracks?

Coop
06-19-2005, 07:31 PM
aluminum head on an iron block + overheating ? Just an idea.

freakydeaky
06-20-2005, 07:26 AM
was your car running somewhat hot?

coupe
06-20-2005, 07:57 AM
Ive never heard this happening to a 3400. Cracked heads are somewhat un heard of.

freakydeaky
06-21-2005, 09:18 AM
are you sure you have a cracked head?..... if not, it could be the gasket.... here's a link APA (http://www.apa.ca/template.asp?DocID=115#GMV6)

iceman
06-21-2005, 09:33 AM
overtorqued??

coupe
06-21-2005, 02:56 PM
I would base it more on over torque. I have seen personaly 3400's over heat to the point of being really scary and still havent cracked heads. Not impossible but ive never seen it nor heard of it happening.

eric99gt
06-21-2005, 03:40 PM
no overheating. Definately not overtorqued. The hottest I've ever seen the temp get was probably 230. And now I come to find I have a cracked lim as well. The tab just keeps on going up.

action
06-22-2005, 06:27 AM
If you had a head gasket fail and the cylinder filled with coolant, the piston comming up may crack the head because water does not compress, so you may have hydrolocked that cylinder. If not, then you may have just had a bad head.

Coop
06-22-2005, 03:41 PM
And now I come to find I have a cracked lim as well.eh? Got any pics of the cracks in the head or intake? This is somewhat intriguing.

coupe
06-23-2005, 05:22 AM
I know im really intriqued by this. Sorry Eric i feel bad for ya its just that most of us have never heard of anything like this happening.

eric99gt
06-23-2005, 01:17 PM
I'll get some soon. Going to pick up my car next week.

Sprucegagt
06-23-2005, 02:00 PM
This might shed some light on things.

http://www.grandamgt.com/forum/showpost.php?p=661139&postcount=502

Eric were did you get your heads from?

eric99gt
06-24-2005, 12:21 PM
May explain the head...but not the LIM. Also the heads were my stock ones that I sent out to colin(the same guy that did blackrider's heads) to get ported.