WILL AGREE WITH YOU COMPLETELY , THEY SHOULDN,T PING, BUT AT 12 DEGREES 90 DEGREE WEATHER AND REGULAR GAS IN THIS PART OF THE COUNTRY RATTLE RATTLE, MINE CHECKED OUT AT EXACTLY 9.0 ONE, HOWEVER I AM RUNNING A STOCK CAM WITH LESS OVERLAP THAN YOURS WHICH SHOULD MAKE MY CYL PRESS HIGHER , BUT AT THE SAME TIME YOU ARE RUNNING MORE LIFT TO CREAT MORE EFFECTIVE CYL PRESS, FINAL JUDGEMENT 8 DEGRESS, REG, GAS 20-22 MPG GIANT 225X15 TIRES AND A GOOD WORKING EGR SYSTEM BUT FUEL QUALITY HERE IS NOT THE BEST EITHER.