Compression test on a 440 Six Pack

[1970CUDAAAR]

I want to do a compression test ton my 440 Six pack now with EFI! What numbers shoud I look for? The engine has been rebuilt and is prety well stock. Thanks!

 

[Ricks72Chlgr440]

I want to do a compression test ton my 440 Six pack now with EFI! What numbers shoud I look for? The engine has been rebuilt and is prety well stock. Thanks!

The actual numbers can vary depending on your compression ratio, camshaft, and even your elevation. Assume you know to block the throttle wide open and then test each cylinder. Run your test and report the numbers for each cylinder here. What you are looking for is consistency across the test. A cylinder that is a few pounds different is not a big deal. One that is > 25 different than others is suspect. If possible, do the test after the engine is warm.

 

[Chryco Psycho]

I would expect to see 125-140 but consistancy is far more important as the post above .

 

[mrmopar340]

10% variance isn't bad. Over thar and could be a myriad of things. Hope it tests well for you.

 

[Xcudame]

A leak down test is another great test to preform if you think something is a miss.