Finished lower end rebuild. Top end rebuild 20,000 milesprior to spinning a bearing on CYL 1&2. New Heads. Started and ran for 20 min or so. Rocky idle but started quieting down and purring. Now engine stopped and will not restart. Low compression on CYL 1-4 (50lbs or less) Normal compression on CYL 5-8. Timeing was right on. Any advice????

 

cam chain loose on 1-4 or jumped a tooth.

 

will check.. also checking head and valves.. checks on coil pack wire harness and resistance on sister cylinders normal. Compression on 5-8 was 125lb. This was my first post as a newbie,,, thanks for the input

 

Tore down block again. Having problems finding timing threads I previously found here for cam sprocket positioning. Please help