THE REASON THEY ARE SO BIG IS THE VLVS ARE THE SAME SIZE AS THE 2.6 ENG WITH A SHORTER STEM LENGTH , AND THE CAM IS THE BEST OF ALL THE STOCK ISUZU CAMS , AND WAS USED IN SOME OF THE LATER RODEOS AND PICKUPS , EVEN WITH THE CARB SET UP YOU WILL NOTICE A BIG IMPROVEMENT , YOU MAY BE ABLE TO FIT THE IMPULSE EXHAUST MANIFOLD AND DOWN PIPE IN THE CHASSIS , SOME OF THE PIPES WILL CLEAR THE TORSION BARS AND SOME WONT, JERRY