I took my 66 Fastback for a cruise today and killed it. I was laying some rubber, had the car sideways, and something went wrong! Number 4 cyl has no compression. I blew air into the cyl and it came out the exaust. At least it didn't come out of the block. It looks like the valve spring is down a little more than the rest. I'm hoping I just floated a valve and bent it.