Switched heads and lost power????

I have a 94 blaster all stock with a lighter flywheel...i had a extra head milld .10... Before i removed the oe head it was 150-150 per cyl......now its 130-130 with new head and sbt head gasket..so i put the old gasket on it to see and still 130-130.. How does this happen??????????? I am lost.. Thanks,,
 
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