Adapter for water port in block - '90-'95
 

I'm planning my coolant reroute, and I figured I'd move the water feed from the front thermostat neck to the port on the side of the block.

Here are the 6AN to M12 x 1.25 fittings from Summit.

I don't have fancy AN lines, so I'm going to try to reuse my 5/16" silicone line. This presents a problem. There's no good way to adapt a 5/16" barb without ordering an expensive part from Australia, a questionably cheap part from China, or adding a 90 degree union and using this 5/16" barb adapter.

I'd rather avoid buying another part + shipping for a total of 3 adapters. I could use a 3/8" adapter or a 6AN push-type adapter.

The 6AN is slightly closer to 5/16" inner diameter, so I'm leaning toward that option.

Inner diameters:
5/16" = 0.3125"
6AN = 0.344"
3/8" = 0.375"

However, if stretching the hose a little bit would risk failure, I can just use the 3 adapters and have a proper 5/16" barb.

You can just get a female -6AN to barb fitting.

Or just make up some AN lines instead so you dont have to replace them every year like you will with the silicone.

Four 6AN 90s.

Block adapter.

Mixing manifold adapter.

Braided line.

M14 adapters for turbo.

That's $100. I'm really quite a fan of the $20 method, especially because my hoses are good for the time being. I am going to replace the heat shielding on the lines, so that will also aid longevity.

I currently am running these lines which are rated for up to 350 degrees F.

AN lines from AN fittings direct work just fine.

Huh, that drops it to about $80. Thanks for the tip. I'm still not sure what I'll choose, but the choice did just get harder.

I could just upgrade to braided PTFE and use standard barbed fittings with clamps.

Dont forget to google for the discount code.