So we looked into the spark plug hole and it looks like a flat top. Guess that means it's a 230. What's the appropriate compression for that? We did a compression test and it hangs around 25
. We added some oil to one of the cylinders and the pressure jumped to about 30, so perhaps a seal issue?
We found the following numbers on the side of the block:
OON2 F16 3877178 C GM27
Any ideas?
