Strange....my 250 is .060 over with 307 pistons and .040 off of head, 194/160 valves,ac,and Texas heat with 2 10" elec. fans and a Superior 2 core alum. rad.and heating problems is something I don't have...some of those "jap crap" radiator cores some people are using now want cool if you have 6 cores... Jerry
