So when people say "Slight massage" it means this....

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Got the tunnel to move about half of what I need using hammers.

Got the grinder out to cut L sections.

Hammered some more and its almost an r30 home.

Had a good look at the shaft on the r30 today. Looks a little different to the 4 speed that was attached to the L20b. The shaft that extends from the spline is shorter.

Any ideas?

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very interested in this post as I am up to this stage as well. I am only using a L16. so I hope I don't have too many dramas.

Speak with engineer but rad was from a holden ute 3core i bought off datsunbeginer.

use a ca or sr alloy one or s13 stock one. Can fit easily between chasis rails. Measure twice fit once.

yes front was trimmed for max airflow.
wasnt neat as most of my stuff but functional.

Yeah crumb... I'll have to around these parts

Are you going to get an engineers certificate?

Cheers crumb,unfamilia and L18_B110 for the advice.

The gearbox mounts are now off (no turning back now)Will dummy fit the box tomoz.

The orange sedan photo is what I'm using as a guide so there's a good chance the tunnel will be replaced.

Which radiator did you use unfamiliar?

I'm guessing the front apron needs to be trimmed to let the air through to the radiator too

I was able to swap gearboxes without pulling the engine in my coupe with a manual tunnel. It wasn't even hard to get the the bellhousing bolts. But it hardly matters anyway - Stumpy Skyline box isn't going to break,so if its got a good clutch, there's not much reason to pull it out more often than every 10yrs or so...

Sedan was engineered with that positioning too...... make it low and far back to handle. May not fit under the bonnet if not done well.

To say the coupes tunnel has been massaged is a nice way of saying it, it has been massaged so far that in one spot they have welded in a patch which is a triangle plate about 150mm long and 30mm wide.

For the position of the engine that is up to you where you make it sit as it depends on what you want from it. The coupe engine sits higher and more forward than the sedan, the sedan was positioned to lower the weight of the engine and put the weight as far back to help with handling and it also allows the radiator to be thicker and taller. The coupe has the radiator mounted under the frame at the front which allows the engine to be mounted forward but as mentioned this puts the weight at the front which wont help the steering.

Here are a couple of photos of the location near the fire wall and radiator.