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**1project2many** · 10-25-2012, 10:49 AM

The higher the pressure, the higher the temp when the coolant boils. If you're going to run the lower pressure cap you might want to use a 180 T-stat to provide a wider temp range between operating temp and boiling temp. Radiator guy might have seen something he didn't like or just might be playing it safe. Can't tell without talking to him. But next higher cap pressure is 10-12 psi and that's what I'd use with 195 T-stat.

The difference for the recovery bottle (overflow) type system vs open system is a small gasket on the bottom of the cap. Look at the original cap upside down and it's probably just brass on the bottom with a gasket inside the cap. Look at a newer cap and there's a gasket where the brass is on the old one. You can use the recovery type cap on the non-recovery system but not vice versa. If you run non-recovery bottle don't fill the radiator to the top or it will push out coolant when it warms up.

10-25-2012, 10:49 AM	#5
1project2many Senior Member Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,217	Re: 56 chevy help??? The higher the pressure, the higher the temp when the coolant boils. If you're going to run the lower pressure cap you might want to use a 180 T-stat to provide a wider temp range between operating temp and boiling temp. Radiator guy might have seen something he didn't like or just might be playing it safe. Can't tell without talking to him. But next higher cap pressure is 10-12 psi and that's what I'd use with 195 T-stat. The difference for the recovery bottle (overflow) type system vs open system is a small gasket on the bottom of the cap. Look at the original cap upside down and it's probably just brass on the bottom with a gasket inside the cap. Look at a newer cap and there's a gasket where the brass is on the old one. You can use the recovery type cap on the non-recovery system but not vice versa. If you run non-recovery bottle don't fill the radiator to the top or it will push out coolant when it warms up.