well its not the headers doing it and the temp runs around 250 somebody told me that when i advance it like that and shut it off after running it that with it being advaced the pressure or something in there causes it to be hard to turn over but if i retard the timeing some it is ok but i lose that quick response and power so i was wondering if i could make that up by useing a adjustable vacume advance and or different weights or springs in the distributor