Sure looks like the head lifted on the middle 2 bores or was not torqued down properly. What torque sequence was used? I hope a spiral pattern from inside out??
Looks like the heads never got torqued properly also is the deck drilled in the center for the use of the 1003 gasket.
This apply to 350 blocks as well
http://www.chevyhiperformance.com/techarticles/90678_small_block_400_cooling_tricks/index.html
Who's heads are those??????????????????
Sure looks like the head lifted on the middle 2 bores or was not torqued down properly. What torque sequence was used? I hope a spiral pattern from inside out??
Yep... Torqued as per AFR says IIRC it was start at 40 and work up to 65 ft lbs
Looks like the heads never got torqued properly also is the deck drilled in the center for the use of the 1003 gasket.
This apply to 350 blocks as well
http://www.chevyhiperformance.com/techarticles/90678_small_block_400_cooling_tricks/index.html
Who's heads are those??????????????????
AFR 180 heads, Felpro .039 gasket with the proper valve pockets. For all I know the deck is not drilled.
The car ran perfect for over a year before this happened... Although that track day was the hardest Ive ever pushed the motor.
Have the heads checked for straightness, looks like it's warped
Were the heads installed on a fresh engine? If not, were the holes in the deck cleaned for accurate tq spec? I torque mine to 70 with arp bolts and moly on the shaft and washer, sealer on threads. Never had a failure even with temps up to 240.
Sent from my GT-I9000 using Tapatalk
Its hard to believe the head would warp that bad if not overheated. It's like there was almost no clamping force left on those middle cylinders. I suspect head bolt failure. Or they viberated their way loose. Did they break loose easy on the center cylinders? What kind of head bolts? I wouldn't reuse them.
You better bust off the other side. I bet it's creeping too.
Was the block decked ???