Need help!...no compression in 6 and 7!!
 

I got on my car the other day to test out my new 30lb injectors. Took it through all the gears, got to the end of the road, turned around, and started to get on it again. Got up to second and heard a ticking/knocking that sounded like it was coming from the top of my motor. I let off immediately. Oil pressure stays fine, the car doesnt smoke..that I've noticed. It only ticks/knocks under load. The number 6 sparkplug was completely black. The rest of the plugs looked like the car may have been running rich...brown.
Did a compression test. All cylinders were between 160-170 with the exception of 6 and 7...which had no compression at all!! Now what should I do?? I havent noticed the car overheating or any signs of a blown head gasket. I may try a compression check again tomorrow to be sure. Any ideas?..please let me know!!:mad:

Sounds like a head gasket, blow air in #6 and see if it comes out #7

How do I blow air into a cylinder??

take out the spark plug, use a blow gun with a rubber tip or the hose off of a compression tester

If it was a head gasket wouldnt I have some compression?

No, the hole is big enough that the air leaks in to the next cyl. its like having a hole in the piston. but easy to check.

You were right! I pulled the head today and the gasket was blown between the two cylinders. Thanks for the help!!