Kinda baffling. How did water get in there?

[disco stu]

Well, I've gotten alot of life out of the last build. And I've been wanting to go through it after losing 5MPH and 3 tenths of et due to less than overzealous portwork that resulted in bad matching and poor runner shape. I had to take about 10% out of my VE table almost everywhere. So, I guess it's time to go thorugh it again.

I put some water in the # 4 and 6 cylinders. I figured I blew a gasket. Pulled it apart and everything looked............ good. Surface rust on the cylinder walls, O2 sensor and exhaust housing. But no sign of water passing on the deck. Cometic gaskets looked perfect. I can only speculate that I lifted the head and water got between the layers.

I dunno, tell me what you think. Oh, and 26 psi, 25 deg of timing, C16, no knock.

 

[Cheeseburger]

Have your head pressure tested, most likely it is cracked and is expanding and exposing the crack when hot......or your block may be cracked...

 

[ijames]

Are these still the ta heads you had back at Indy? Did you have more port work done to them? 5 mph is a pretty big loss. Anyway, I agree either lifting the head or a crack somewhere in the head or block.

 

[XLR8]

Check the heads - I had a cracked head and hydrolocked the motor.

 

[disco stu]

Are these still the ta heads you had back at Indy? Did you have more port work done to them? 5 mph is a pretty big loss. Anyway, I agree either lifting the head or a crack somewhere in the head or block.

Same heads, same condition. Seeing the ports again reminds me of how pissed I was when I pulled the heads out of the box when I got them back.

I could have done better myself, and I am not a head porting specialist nor do I work at a machine shop.