Hmm. sounds just like my '65 stang did in high school...sucked a valve (still have what's left of it). the eaiser fix at the time was a replacement 289 from the wrecking yard...should have sleved it, replaced the pistion and rod and done the head.thehulk said:
I would pull the plugs and slide a fiberoptic camera into each cylinder...quicker and cheaper than pulling the head.
good luck.