I am currently rebuilding my 306. I have issues with the valve guides and while the heads off I decided while I had it apart I would put in new bearings and new rings. I ordered rings from Summit and they are made by Hastings. Upon measuring the end gap I have .024 end gap on the top compression ring and .023 on the second compression ring. The spec according to Hasting is max of .022. Ideally I would like to run the gap at .018. It is naturally aspirated and puts out 318rwhp at the wheels. The bore measures 4.0315.
I am wondering if anyone has had this issue?
I am contemplating whether to run these rings, or order .040 rings and file them to fit???
I am wondering if anyone has had this issue?
I am contemplating whether to run these rings, or order .040 rings and file them to fit???