wierd cylinder compression

[johnny ga]

i have a 318 bored 60 over crane cam each cylinder has a 10lb increase in pressure cyl 1and 2 the same 3and 4 the same5and 6 the same 7and 8 the same. late model 302 head. motor runs good.

 

[Jerry Hall]

So you are saying you have 30 psi difference between cylinders 1 & 8. That sounds on the verge of not good, but if it's running OK, it can be run longer, but I would venture to say that the power is down noticeably. Maybe the even distribution of cylinder pressure loss is making it run smoothly.

 

[khryslerkid]

Make sure your throttle plates are open and the choke is open.

 

[BSB67]

What are the numbers?

 

[johnny ga]

starting at 130 and going to 170 motor is fast when it the 72 challenger

 

[BSB67]

Next step. Redo the test. Count 5 hits on the gauge each time. This time start the test on the cylinder where you finished the last test and work in reverse order.

 

[oldkimmer]

Try doing 5 and see where it’s at. Then on the lower cylinders do 8 and see if it goes up. If it does u have bad valve guides and a bad valve job. Kim