Temperature problems

[Cristian]

Back at the beginning , Why did you swap the Original pump for the Weiand pump ??
Was it having the overheating problems back then , with the Original pump ?
Were you putting the Weiand Pump on it to try and cure a problem that was really caused by something else ?
Maybe it has an internal leak that is letting cylinder combustion pressure into the cooling system ( like a blown head gasket , cracked block , or cracked head )

There wasn't any problem with the original pump, we just had this Weiand and thought it may work better, which didn't happened. We've already changed head gaskets and checked the heads, the next step is check the block deck and do the pressure check; all of this is almost ready, I just need some time to go to the machining shop and ask what happened with my block.

if the radiator is lower, make sure that you burp the system several times. Also, if the engine is down this far, you should have it pressure tested and check the deck to make sure its true. If the coolant system is getting pressurized, you need to fix that before all else. It will either be leaking head gaskets, warped deck or cracks in the cooling jacket causing pressure to get in (verify to be sure). I wouldn't reassemble and risk ruining more parts. Most shops can pressure test a block and check the deck squareness for pretty cheap.

Thanks, I'm about to know what is going on with the block, everything else is ok. Can you tell me more easily what it means "burp the system"?, sorry but am from Chile and not very familiarized with some terms haha.

OK so first of all who much pressure, you do have a pressure cap on rad and it will make pressure as it heats up.
If your system is ok run it with cap off, till thermostat opens, yes run a thermostat or the engine can have cooling issues. Also have you ran a block tech, most shops have the kit or you can get one from NAPA to check for exh gasses in coolant. ALSO you either need a water pump lube or some antifreeze or your engine can have issues.
Car should be able to idle with cap off hot idling, if you have electric fans you want your fans to turn on at about 200ish, run and be able to watch temp fall, fans shut off, fan clutch same way, solid fan never should over heat.
Down road you should ba around the thermostat temp give or take. My BBC always ran 160 on 160 and 180 0n 180.
My Monza with factory 3 row and electric never gave me an issue and Iran my temp control from my temp gauge.
I intend to do same on both my current projects.
Most AutoZones have pressure testers to rent but dont forget the system, if there is no cap will continue to build pressure but it shouldnt do so fast.

I'll do the test with the cap off if the problem persists, thanks for the answer!.