Cooling the heads on these motors is like spraying a water gun on a bonfire besides I can lower the temperature by 10-15 degrees just by taking the lowers OFF these idiots want you to put the lowers on to cool the heads off that are getting restricted air flow because the lowers are on to cool the heads that are getting restricted air flow because the lowers are on to cool the heads that are getting restricted air flow because the lowers are on to cool the heads because they are getting restricted air flow SLAP OK I snapped out of it.