3.0 top rebuild options
 

My cracked air box fix turned into a top end after I found 4 cylinders with bad leak down due to broken rings.

So, while Im in there...
My Mahle cylinders are good so do I put in 9.5 or 9.8 CR with a 964 grind cam?

Or, go bigger bore P&C?

Already have SSI and backdate exhaust.

Need some guidance and appreciate anyones comments.

Hey jellonailer....I've attached a link to our tech articles on the 911's engine. Hopefully you'll find some useful info on your rebuild. If you have any further questions or need tech help, feel free to post a Comment below an article and someone will get back to you with more detailed info. Best of luck! :)

911 Engine Tech Articles - Porsche 911 (1965-1989) Technical Articles - Pelican Parts

-Dmitry