ckeeton84gt40p

This car has had 4 heater cores put in in the last few years. I have the restrictor in and I have also put in a crossover pipe between the inlet and outlet hoses to try to relieve some pressure, but it obviously isn't doing anything. Any suggestions or ideas on why it's doing this?

Edit: It is a 5 speed if that helps at all...I don't know why it would, but there ya go. haha

KNS1

What type of water pump you using? They do have hi volume pumps and that maybe your problem. Maybe there is a restriction in the return hose?

ckeeton84gt40p

it has a stock H.O. water pump on it since the front cover, oil pan, water pump, etc. had to be changed to put the engine in the car.

update: i talked to a friend who thinks maybe the radiator cap holds too much pressure. it makes sense, but could it be that simple? guess i'll pick up a cap with a lower pressure and see what happens.