[Ant]

Plumbing engine to remote T-Stat is by -12 lines from my Yates heads, and with the Weiand remote T-Stat, I am intending on making a little alloy header tank that has internal bolts attaching it to this housing!!!

My question is from the header tank to the top of the radiator, I thought it easier and tidier to go to maybe -16 hosing, but I am not sure whether this will have enough flow, but based on the two -12 going to the T-Stat, I would guess a -16 should have equivalent or more volume that two -12?
The other point is cost as going to -16, -20 fittings get pricey!