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The Terminator
Engine/Tuning
Valve relief ?
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<blockquote data-quote="SlowSVT" data-source="post: 15138016" data-attributes="member: 20202"><p>What MMR didn't tell you this is where the piston will fail first but there is no getting around a relief with a big bump stick.</p><p></p><p>Take some 600-800 grit sand paper and smooth the sharp edges. Don't worry about the ring land section of the piston touching the cylinder wall. By design they are ~.01 smaller dia then the skirts which allows gas pressure down into the ring lands to force the rings down on their seats and out against the cylinder wall.</p><p></p><p>Wouldn't hurt to put some clay on the relief and install the head with the cam installed and confirm the relief is in the correct location. Malcolm checked this on his build and discovered Diamond machined the reliefs in the wrong location which would have destroyed his engine. At first they had the audacity and denied any responsibility but later admitted they screwed-up and had to make him a whole new set. Not many people perform this check.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 15138016, member: 20202"] What MMR didn't tell you this is where the piston will fail first but there is no getting around a relief with a big bump stick. Take some 600-800 grit sand paper and smooth the sharp edges. Don't worry about the ring land section of the piston touching the cylinder wall. By design they are ~.01 smaller dia then the skirts which allows gas pressure down into the ring lands to force the rings down on their seats and out against the cylinder wall. Wouldn't hurt to put some clay on the relief and install the head with the cam installed and confirm the relief is in the correct location. Malcolm checked this on his build and discovered Diamond machined the reliefs in the wrong location which would have destroyed his engine. At first they had the audacity and denied any responsibility but later admitted they screwed-up and had to make him a whole new set. Not many people perform this check. [/QUOTE]
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