Hello everyone. I have a 327 in my MCSS. I built it last winter when I did almost everything to the car but paint. The 327 is bored .30 over, roller cam, roller rockers, 492 GM angle plug heads, and Holley sniper EFI. I put a brand new aluminum 3 core radiator in the car when I put it all together also. When I cruise on the highway or open roads it runs nice and cool. I forgot to mention I have a 160 degree thermostat in it. I had a 180 in it but ran to warm when I would drive in town and traffic so I went to 160. When I get in town and stop and go traffic it gets up to 200 or so from the 160 at cruising. Anyone know why this is? I also put the stock fan and clutch on it from the 305. Fan clutch works as it should also. Thanks all.