using the Summit in my Ranchero max 195 degrees on 110 degree days. Only issue is that it doesn't have a drain petcock. I put one in my hose adapter for the lower hose. Had it in sinc 2008.
1968 Ranchero 390. 060 over,10.5:1, Comp 292H Cam, Performer RPM intake, Hooker headers, 4spd. 3.89 dif. ProForm 750 DP, Mallory Unilite distributor, Holley Annihilator cd ignition system, centerforce df clutch.