ok so i've got a 69 302h.o. that i just had the works done to including port and polish... and i'm bolting up my new rpm air gap manifold... using the bolts that i used last time for putting my intake on.... one is too short and just will not grab the threads in the head... that right there is odd... but anyways... so like most people would do... i go thru my boxes of bolts and find one about an 8th of an inch longer, its got grade8 markings on top.... i'm putting it in and at 24lbs of torque... it snaps off inside.... any tricks to getting that out... prefferably without removing the intake manifold??