Well I did the block radiator test and it came up negative. I'm sceptical. The liquid should turn from blue to yellow and I got nothing after 10 minutes so I put at the tail pipe and it took 3 minutes just to turn green. I don't think the 110 Octane makes a difference.
Ordered a custom aluminum racing radiator so after that's installed more than likely it will be a new head gasket.

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Well a Cometic Gasket is $90 and a Tomei is $110. After that it's just a pain in the ass to pull everything apart. For $300, I can replace a radiator in 10 minutes. 👍

Doubt if it's the head gasket ... more likely the fan

Cometic copper gasket needs special deck & head prep

Radiator showed up. 2 core instead of my old single. 50mm thick instead of my old 30mm. Basically the same - length but I'll have to modify the mounts to get it in. Maybe I'll get a new fan setup as well.

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Radiator fits nicely and is working. I ordered a new fan thermostat plug for the radiator. The current one was 95c - 85c which allowed the temperature to raise up a little bit. I ordered a Fiat plug out of England that is 90c - 80c. Should keep the temperature down. I do still have a fan "ON" override switch.

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Well I've ordered two fan temp switches since then. The 90-80c switch was still too hot so I ordered an 82-77c switch which was too cold so I have a 87-82c coming in the mail. If that doesn't do the trick I'll just order an adjustable fan switch from Summit Racing.
Also considering upgrading my MSD Ignition box. I currently run the StreetFire Series which is an introductory box. Thinking about ordering the Digital 6A box. It puts out a better spark.
The goal is to break into the 10's next season. 🙂

Some recent photos.
New radiator installed with relocated fan switch sensor.
And newly installed MSD 6A which throws a better spark than my old MSD Street Fire Box.

Am finally going to schedule a Dyno tune soon. Been talking with the local shop.
Need to know:
1. Running Fat or Lean
2. Best Ignition Timing setting
3. Best Spark Plug Gap
4. Best RPM shift for Maximum Horse Power
5. Over all Horse Power output on Motor and also on Nitrous.

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looks good

Nissan puts their temp senders in the tank bottom or in the lower hose, dunno if that makes a differene