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The radiator cap pressureizes the cooling system.
Pressureized coolant prevents nucleic boiling which causes hot spots to form on cylinder heads, hot spots cause cracks.
Pressure also it keep the coolant pump from cavitating.
It doesn't seem like a good idea to me.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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