I READ AN ARTICLE ABOUT THIS MOTOR IN CHEVY HI PERFORMANCE A COUPLE MONTHS AGO IN FORUMS. I WILL TRY TO FIND IT LATER AND POST GREATER DETAIL LATER. BUT WHAT THEY WERE SAYING IS THAT THERE IS A VERY LIMITED AMOUNT OF PERFORMANCE PARTS MADE FOR THIS MOTOR DUE TO THE DIRECTION THAT #7 INTAKE RUNNER HEADS .