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What is the compression ration on a stock L28 with a N47 head. What do you think that it would be if i did a complete engine rebuild, new gaskets, rings, bearings, and flat top pistons, and a 480 lift cam in the N47. Do you think that it is worth it to put the flat top pistons in. thanks a lot.

CHUCK
 

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With the flat-tops it should be around 8.5:1, provided you don't change head gasket size. The cam doesn't affect compression ratio.
 
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