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have you replaced the radiator/reservoir cap?
replace the radiator/reservoir cap again.....if it is building up enough pressure to do this..the problem is still in the heads...maybe the machine shop has missed a small crack..sorry,,but if it isn't the cap..it will need to come apart again
yes..all it takes is getting hot one time.....take your first heads and get them checked,and shaved ..install new head gaskets and it should be ok
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