Got a 292 y-block bored .060 over, clay smith cam .485 valve lift, 240 duration @ .050. '57 posted heads, pressurized rockers, with 11-1 compression. Heads were completely redone and checked for cracks and everything before putting them on the engine when it was built.

My problem is I'm pushing coolant when I'm turning the rpms up high. I'll be going down the freeway in 3rd gear at 3,000-3,500rpms and get on it to pass traffic at about 4,000 rpms it'll push coolant. And it's not always consistent. I put roughly 80 miles on it over the weekend pulling a trailer and it never did it. Been doing it ever since I've fired up the engine for the first time and have about 6,500 miles on it. I've tried restrictor washers, different pressure caps, and I've made sure they actually seal good. I have a moroso 14-18 pressure cap on it now. Box says it's a 16lb cap. Put thermostats in it. Vacuum sealed the system hoping to get air pockets out. Would an air pocket do that? And it doesn't run hot. I have a 160 thermostat in it now and it stays 180-185 degrees all the time, in traffic, going down the freeway, etc.

I've pressurized the system checking the head gaskets, never lost pressure. Don't have coolant in the cylinders after sitting over night. No coolant in the oil or oil in coolant. Made sure the headgaskets weren't installed backwards. The corner of the gasket is sticking out of the heads up front towards the intake like they should be. Anyone have any suggestions? Thanks in advance!