cant keep myhead gasket from leaking

[kenny]

i put in a big bore kit with oe head gasket.dumb i know.rode 4 3 or 4 hours blew on left side.disassembled ordered copper gasket for 89 mm bore .043 thick.replaced studs.rode 30 mins blew again left side.im tired of building it.cam cover time serted.does anybody retorque head bolts after initial warm up.what a job to do that.the cyl has been decked .007 head was true with a straight edge.i sanded with 400 grit figure 8 style on a big piece of glass.please let me know the trick to keep this together.also left side stud nut has about 20lbs after disassembling blown.does anybody use loctite.on head nuts

[Aceman]

What compression and size of bore kit is in your motor? Since you already replaced the head studs, I don't think that is your problem anymore. If it was me I would buy another gasket, spray it with that copper head gasket coating, and install it. Torque your head bolts in the proper pattern in about 3 steps. Warm your quad up, run it around for a little bit, then retorque the head bolts again. If it head gasket blows again you have real problems. By the way I use a fiber type gasket on my 330 kit. When I installed it, I sprayed it down with copper gasket sealant and tightened it down. Needless to say, I ended up tearing the engine down for another reason and I couldn't separate the head from the cylinder, it was sealed that tight. That is proof enough for me that copper gasket sealant works.

[skemp]

HD head studs. 440's don't like to stay sealed up, but with the proper gasket, and HD studs the ball is in your court. I re-torque mine after the first ride. I have only blown one gasket in this, and it was a Cometic gasket. I was in a pinch and didn't have access to another gasket and sure enough it blew on the first ride.

[Aceman]

Originally posted by kenny
replaced studs.rode 30 mins blew

He said he already did that.

What compression piston???????????????

[UglyMotha™]

rico could you put that in the form of a question :o

Originally posted by UglyMotha™
rico could you put that in the form of a question :o


NO but I could put my foot in yo ***...:macho

[skemp]

Originally posted by Aceman
He said he already did that.

He didn't say HD studs. The HD studs are a larger diameter and use course threads. They hold a hell of a lot more than stock studs.

[Aceman]

Originally posted by skemp
He didn't say HD studs. The HD studs are a larger diameter and use course threads. They hold a hell of a lot more than stock studs.

My mistake, I naturally just assumed HD studs.

[UglyMotha™]

Originally posted by Aceman
My mistake, I naturally just assumed HD studs.




its okay............. i'm a mistake too :o

[Glamis400ex]

HD studs and Flexsteel gasket.

Glamis

[Dave400ex]

Are the HD Studs needed for a 416 10.8:1 Piston?

[cals400ex]

Originally posted by Dave400ex
Are the HD Studs needed for a 416 10.8:1 Piston?

i am running the stock studs with the same compression piston. you should be fine but some people have run into problems. i usually hear around 11:1 you should be getting heavier studs. i would leave it like it is unless you have a problem.

[Dave400ex]

Ok my motor is being built right now. I am using the steel flex gaskets!

[Glamis400ex]

It's a crap shoot really. My buddy has 12.5:1 and OEM studs. I have 11.0:1 and have HD. Go figure.

Glamis

[WhiteBros400ex]

Take a big pieice of sand papper and sand the head until the gasket surface gets sanded evenly it but be uneven and letting pressure out and blowing it all the time so try that.