Compression test results - Comments please.

[jgresham75]

Been having some problems with my 1999 5.0GL (actually block replaced with a 5.7). Did compression test (looked at other posts to find recommended procedure-removed all plugs, ground spark system, etc.) and tested each cylinder. Let it crank 4-5 times per cylinder. Results are:
1-127
2-117
3-150
4-131
5-136
6-128
7-146
8-124

I read that lowest should be no less than 70% of highest. Therefore, assuming that, #2 in within that range of #3.

Details of the engine- replaced the head gaskets and saw the engine was rebuilt with .040 over pistons.

Do these overall test results seem reasonable for a 5.7 chevy engine? Thanks in advance.

(Note: I had the heads rebuilt and planed. My concern is that the block deck is not level and may be having some issues.)

 

[jerryjerry05]

Re: Compression test results - Comments please.

Testing comp.Let the motor turn over till the guage stops.4-5 turns might not give the right reading.Like the other post? Any water in the cylinders?

 

[Lou C]

Re: Compression test results - Comments please.

also is that a hot or cold reading, was the throttle plate open? for comp test results to be accurate, the engine has to be warmed up to op temp and throttle plate open...