I would not recommend it... Once on my dad's 55 Chebby truck with a 235 we had a 9lb cap on it. My dad put it on because it came with the new coolant overflow bottle. Well it seemed fine until we took a trip up to Reno (up I-80, lots of uphill climbing). Started running hot, so we pulled over and let it cool down for a while. Started off again, and the same thing happened. Took the cap off, and it blew coolant all over the place. Months later, we went up to the mountains again, this time with a 7lb. cap. Made all the difference in the world. No more problems at all. Your over heating problem had absolutly nothing to do with a higher pressure cap. It is not black magic, just physics. Water simply boils at a higher temp while under a higher pressure. An engine won't overheat sooner because you put a higher pressure cap on the radiator.:confused: Can you explain how this could be? An engine cools down based on how fast you can transfer heat from it into the ambient air. The pressure on the coolant (a non compressable fluid) has nothing to do with heat transfer. As for coolant recovery the cap pressure is only the relief pressure,as the return check valve is an other part of the cap.

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