I was programming my Blitz boost controller and doing a run of 18 psi which I always do. Heard loud clatter. I hope my engine block is not damage or pistons. I will do a compression check. I am running stock bearings and probe H-beab rods. I started hearing faint rod knock at start up recently but goes a away after a few seconds when oil pressure builds up. My friend said he lost two rod bearings on his Supra because they were too tight. There not enough oil can get between the crank.