Daphur280 Posted August 31, 2009 Share Posted August 31, 2009 So I'm putting together a rebuilt L28et, I had the head (p90a, not sure if that's relevant, kinda new at this) milled down about .020" or less (I believe) and i have a fel-pro copper shim thats .020" thick. Now originally I was told to put this on top of the head gasket, but as I was reading the directions that came with the shim, it said to place it directly onto the block, and then place the head gasket on top of that. And also to apply a "sealant" onto either side of the shim. So which would it be: A: On top of the block and underneath the gasket (with sealant?), or; B: On top of the gasket and underneath the head? I've never used a shim before on a rebuild, nor have ever had to apply sealant onto the gasket, so I want to do this right, cos the next time I intend on taking this motor out is to put in a RB30 and preferabley not beforehand should this all go wrong. . . So any advice? Quote Link to comment Share on other sites More sharing options...
Xnke Posted September 1, 2009 Share Posted September 1, 2009 Head shims for the L-series, at least the ones I have, go under the cam towers, not even on the same side of the head as the headgasket. Maybe it's a different type of shim then I'm used to? Quote Link to comment Share on other sites More sharing options...
MAG58 Posted September 1, 2009 Share Posted September 1, 2009 I've seen shims that go between the block and head. They're designed to maintain the compression ratio after it's been decked. I would follow the directions and use copper-coat for your sealant. Quote Link to comment Share on other sites More sharing options...
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