I know this is not the correct site, someone on pelican told me to ask on this site maybe you all know here .I’m looking to put a number 16 AN and a number 12 AN line through the right side heater duct in the right side longitudinal does anyone know if they both fit I’m looking to hook into dry, sump tank, thermostat, and cooler in the front thanks for any information slamming out

Easiest way is to run behind the rocker cover. Are you opposed to that idea?

That seems very large

Most people run AN12 for both lines through the drivers side rocker panel to a front GT Oil Cooler. I am currently running steel braided lines but will be replacing it with hard lines in the future. Here is an example. https://www.elephantracing.com/porsche/914/...r-plumbing-kit/
https://914-6werkshop.com/product/914-6-gt-hard-lines/