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cooling system conversion-which overflow?

I used a "coolant Recovery" bottle from Pep Boys. Comes with fire-wall bracket and hose (fits where stock pressure bottle goes). Insure your radiator cap is intended for use with a recovery system. The proper cap has two internal valves; one lets coolant escape as it expands with heat, then the other lets coolant from the recovery bottle return to the radiator as it cools (causing a vacuum in the system).
 
No pix but I used a generic $15 bottle from summit...

http://store.summitracing.com/defau...earchinresults=false&N=0&target=egnsearch.asp

Put the hose from the radiator neck to the bottom with the valve open, and put another piece of hose off the top for the overflow.

I used a doubled-up piece of plumbers tape (steel strap w/ holes) and mounted mine in place of the factory bottle "shelf" using one of it's bolt holes
 
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