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Author Topic:   Blown head gasket??
posted July 25, 2004 03:47 PM
What will cause a blown head gasket? Only had about 4 hot laps and 5 race laps.. Between #3 and #5 pistons look good just took out about 1 1/2 of the head gasket between....this was a 1003 but was kinda old stock...had it laying around a few years....its the kind that the fire ring is not solid between holes and does not have the dark blue rtv looking ridges on it? Temp never went up. I checked the deck and there is no dip there and the head was brand new? Just looking at what will cause one to blow.

posted July 25, 2004 08:11 PM
I had a similar problem last year and after I pulled the head, I found a little washout in the head between the two cylinders. I had someone weld it up with nickel, and the machine shop mill it back down smooth, and have had no problems since.

posted July 26, 2004 09:13 AM
What about if i didnt retorqe the head?

posted July 27, 2004 06:19 AM
everyone that builds motors does some things a little different. Everyone does what has worked for them in the past, so i'm not saying anyone is right or wrong.....because whatever works for you is the right way.

On steel headed motors I personally have had more head gaskets leak AFTER re-torueing them..... on a steel headed motor I over-toque the heads 3 pounds when I assemble motor then never touch them again.

On a aluminum headed motor I re-torque the heads......the reason for this is aluminum expands at twice the rate of steel so the gasket will crush more during break-in leaving the torque to low allowing it to burn the gasket.

Re torqueing a head isn't because of bolt stretch its because of gasket crush..

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