krissetsfire

iTrader: (1)

felpro gasket. what's the reason for that crappy finish to chip off?

Full_Tilt_Boogie

iTrader: (1)

That coating just sticks and then it pulls off when you remove it.

You weren't planning on reusing the headgasket were you?

18psi

iTrader: (76)

Yup, that's normal.

krissetsfire

iTrader: (1)

No I pulled it cause 4th cylinder was leaking coolant I'm guessing from that spot. The pieces missing were nowhere to be found and not stuck to the head or block.

Full_Tilt_Boogie

iTrader: (1)

You blew your head gasket, lol

krissetsfire

iTrader: (1)

no ****. I've never seen a coolant passage get blown out like that. Was curious if there is anything i should do differently since I only have 150 miles on that headgasket after a rebuild. Torqued my arp studs to 65 ft/lbs per general consensus on the arp head stud thread/flying miata. Head and block are machined and within spec.

zipstrips

iTrader: (2)

possible your coolant system had air pockets still, under boost this could lead the HG failure.

Amellrotts

iTrader: (2)

Hello everyone....

curly

iTrader: (25)

Is there a different finish between #4 and the back of the head?

krissetsfire

iTrader: (1)

thank you. this is more along the lines of what I was looking for. If what you say is possible and correct this could have very well caused it. I let it run for a while and burped it but my reservoir needs to be replaced and I wouldn't be surprised if it sucked air.

I've only seen head gasket failures from overheating. I don't doubt there are other possibilities like detonation. Has anyone else had personal experience or seen this on their car?

krissetsfire

iTrader: (1)

yeah curly some chump at the machine shop lightly scratched the head on the back so it was cleaned up with a very fine stone. It is in good shape and perfectly flat. I trust my machine shop guy and any other machine shop guys can chime in here and hopefully back that.

18psi

iTrader: (76)

yes I've seen it on a perfectly assembled and perfectly running car.

replaced it and it ran like a champ. absolutely nothing else was done, just a simple swap.

So yeah, like I already said nothing looks outa the ordinary, check everything over replace and try again
you mean just that one part? EWWW

I don't care what the guy says, I'd still be very very paranoid about that

krissetsfire

iTrader: (1)

I was so I had my uncle who is a retired calibrator for raytheon measure it. He gave it his approval and since he calibrated machines making missile parts and such for 30 years i trust him too.

Also my machine shop guy is a very honest and precise guy. because of it he charged me nothing and promised if I had problems he would replace and install it at no charge. Said he would put it on his car even and not think about it. Edit: also the stone marks are not just in that spot they are all over. It's across the whole head. The head was warped slightly when i took it in and he took it down accordingly.

Im trusting what you said about replacing it and being fine I just wanted to show pictures to see if anyone else had any similar experiences.

curly

iTrader: (25)

I've used one of those stones before. For a lot of stuff. You could use it for 24 hours straight on a head and take of maybe .001 or .002" max. They do nothing. You'd have a mirror finish by then though. That's probably why it looks discolored.