[Razorback1980]

Of course it's hard to tell from here....what all did you remove on the top engine refresh? Did you change anything on the timing or balance belts? I wouldn't suspect a rod bearing...that knocking usually gets louder with rpms. I've seen timing do that on other cars...I'm thinking a 951 has a knock sensor...check it's connection...maybe it was knocked off if not, check it to make sure the sensor is good.