Here is Frank's own words on is rad conversion from Sprite Spot:
On Tuesday, September 23, 2014 1:04 PM, "email@example.com"
>Swift radiators on eBay start at $44. Bill in oregon
>From: Spridgets [mailto:firstname.lastname@example.org] On Behalf Of Kirk
>Sent: Tuesday, September 23, 2014 12:13 PM
>To: bmwwxman .; Spridgets
>Subject: Re: [Spridgets] Water temp question..
>Re: a small loss of pressure.
>Very well might have been why my stock radiators would not keep my engine
>cool. They were way off the chart into overheated territory.
>More than what would be expected just because they were designed for a
>But I am happy that the situation caused me to pirate the radiator out of
>(I hear that the Type E cooling system can be difficult. That it must be
>maintained to the max or it will radically overheat).
>Suggested annual donation: $12.75