i have a used 400 sbc with a built to the hill bottom end. balenced/blueprinted/polished/debured/knife edged crank/smothed and balenced rods. 2 bolt main with 30 over pistions. motor ran super strong when i got it. pushed my 6500lb 1ton all over the country side. ran 210 all the time on the stock gauge in dash. never went abouve till i spun the water pump belt off and over heated it . bad: needs crank and rod work. played just a bit to hard one day and just started to smoosh #1 rod bearing in cap. NO IT DIDNT SPIN!!! it just started to press out the sides by a 1000th or so. and from motor being apart in back of garage needs cylinders honed . slight surface rust. and i noticed 2 diffrent styles of pistions but super close to the same all around. heads are all remaned 76cc heads. i was told if i wanted to make her run to swap on a set of 64cc heads and the motor would sing. make me a offer and come and get it for the right price. pm me please thanks.