Blown Head Gaskets
John B. Lunsford
JBLMk3
Asheville, NC
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BLOWN HEAD GASKETS

The following pictures are of a Felpro installed about 800 miles ago. I installed it with ARP pro bolts and torqued to 80 ft/lbs. with ARP moly lube. Obviously, Felpro stock type gaskets just don't hold up. It should be noted that there were absolutely none of the usual signs of detonation.

Blown Felpro
Notice the bulges. The gasket pinched up into the head.

Blown Felpro

Blown Felpro

Blown Felpro

Blown Felpro
You can see that the problems was starting here as well.

Bridge

Bridge
On the block, there is only one coolant hole and the gasket has two, with the section between them going directly over the one hole in the block. The head has two with a passage right in the middle.

Before
Head surface before lapping.

After
Head surface after mild lapping.

Block
Block deck after lapping.

Block

Block

Block

Block


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For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
John 3:16


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