Help Redtop has Metallic rattle after warmed up

[Sr20det>Ka24de]

I just finished my redtop swap and the engine has a very annoying metallic rattle, does not sound like timing chain- noise is loudest at front of engine on cylinder head, goes away with any rpm higher than idle, any suggestions?

Also my cooling system does not build pressure, I have no external leaks, temp averages around 192 according to consult-II and my fans work great - not sure bout this:hammer:

[codunc]

check your oil for coolant, make sure it doesnt look milky

[johngriff]

Cooling system needs to be bled.

Air in lifters, loose rocker arms, bad timing chain tensioner, destroyed oil pump.

OR OR OR.

The water pump is toast, creating both issues.

[Sr20det>Ka24de]

Lifters were noisey at first start up then they pumped up and were ok every start up since, stethescope on the water pump is quiet just sounds like a normal pump, gonna check oil pressure tomorrow I don't want to daily drive it until this noise is resolved

Noise sounds like a someone left a wrench on the intake manifold and its rattling lol but that is not the case i checked for all loose brackets and possible missing tools - no dice, noise is definitely from front of engine close to head

[johngriff]

There is a safety guard in between the cams for the chain, inspect that for wear.