· Don't call me a "senior"!
- Reaction score
That the two cylinders have roughly the same compression is more important than the compression ratio per se (if you find more than a 10-15% difference, then I would worry). Getting 270 psi means that you still have about 18:1; not bad for an old engine. Try the "wet" test and see if they are still pretty close to each other. If so, you're probably OK.