My 340 is bored .060 over and I don't know what the compression is as I
didn't build it, however my cylinder pressure is 195 which is pretty stout
and I run a rock solid 180 pretty much all the time, really hot and in
traffic 190 and I also have no shroud.
I Increased my
initial timing and it lowered my temps over 10 degrees. I Don't know about
aluminum radiators, but I do know US Radiators makes a killer set up. They
can make a 2 3 or 4 core unit, aluminum radiators and one the call the
desert cooler. I think I paid about 230 for mine. It's nice and other than the
part number and pentstar, it looks stock.
FWIW
