Yes it's possible to have leaks without smelling or them being super noticeable.
But according to you you have no leak.
Pressure test the. Cooling system to like 16 psi. Should be able to see the leak then.
The head should be checked for cracks cleaned and machined for any hg job. Only the smoothness of the machine job matters for the style of hg.
Head could be cracked.
Hose could have a pinhole.
Heater core could be toast.
Have you pressure checked the cooling system?
Have you done a...
Personally. I'd find a better head. There's tons of 7m heads not be used out there. And turbo and na heads are the same.
And ya don't mix match caps from different heads. And keep them in the order the marked. Also torque to specs in the sequence.
As long as its not knocking or have a bhg or been overheated. I would just put all new seals hoses and a new hg with arp studs and leave the bottom end alone except maybe a new oil pump.
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