more than spark knock,although that was some of my noise.the small knock turned to a large knock and now it is not drivable,.my buddy who is a mech. listened to it and said piston rod kbnock.Ill know for sure when I take it apart.is there an easey fix whithout doing an entire rebuild and taking the motor out?

oh what a feeling:
#1 86 xtra cab 22R,EB 261 cam ,Hooker header,2" ex with cherry bomb, Aussie powered
#2 86 sr5 4x4 efi parts truck
#3 87 2wd parts truck
84 supra yard art