AS FAR AS THE BLOCK GOES, IT WILLL HANDLE ALOT. FOR THE REST OF THE MOTOR IS THE FACTOR AS STATED SEVEAL TIMES ABOVE. I ON THE OTHER HAND HAVE TESTED BONE YARD MOTORS AND HAVE HAD A 250 HIT LAST QUIT A WHILE ON A BONE STOCK BOTTOM END. AND 400 ON A MILDLY BUIT BOTTOM END WITH HYP. PISTONS, PINK RODS AND A STOCK CRANK. ITS ALL IN THE TUNE.:yes: