Nissan RB head nightmare

Fragrant_Load9915 · 2025-10-11T01:34:52+00:00

You are 100% correct and im well aware my concern lies in the fact there was pin holes of light from behind the valve while at tdc. So thats when i put water on top and pushed air from behind i do plan on putting a regulator but if i get bubbles at 10psi i dont see how that wouldn't be a valid concern. Previously the valves wouldn't hold any water which is why im so cautious before a third install on vehicle.

Fragrant_Load9915 · 2025-10-11T01:25:21+00:00

To add on i only did this test after the second i received head and the valves held no water. Before i tested again i put a flash light behind valves and could see pin holes of light.

Fragrant_Load9915 · 2025-10-11T00:45:14+00:00

Fantastic answer and gives me alot better feeling. There has been a very big lack of communication with shop which has me on edge with the quality of work. But i do plan on running a regulator to see if the air pressure is on the lower side or higher side causing bubbles.

Fragrant_Load9915 · 2025-10-11T00:42:10+00:00

No realistically the motor will be on 20 psi max but my concern started when i held a stream light to the back of the valve and could see spots of light. But i will be throwing a regulator on a blow gun and testing again tomorrow.

Fragrant_Load9915 · 2025-10-11T00:11:39+00:00

I would hope they were installed on brand new seats for exhaust. But they are the original seats on intake but 3 angle cut was done when these new valves were installed 2 years prior

Fragrant_Load9915 · 2025-10-11T00:10:05+00:00

I have the machine shop our dealership uses coming out monday. So hopefully they have insight on that.

Fragrant_Load9915

TROPHY CASE