This is a very strong bbc ,has rec. Port heads, with good valves 704 roller,solid,runs on pump gas , went 11.40s in my 71 chevelle ss street car ,runs on 92 pumpgas,victor intake ,balanced bottom end,steel crank,steel rods, forged pistions,good oil pump,timing chain 15,000 miles,i went back to the orginal motor so dont need this, we need a small motorhome to pull race car to track and stay,would like 1 with a gen.,bathroom, air cond.,ect...