Yunick and Yenko weren't the only American racing icons to hook up with Weslake Engineering (no "t" in Weslake) during the 60s.
Dan Gurney turned to them to build hot rod heads for the small block Ford, the engines for his late sixties Indy cars and the engines for his efforts in Gran Prix racing during 1967-68. Apparently some of the SB Ford heads made it to the street (see Engineering link below).
The GP car won a few races but wasn't all that successful. The car was ahead of its time in many ways, including the use of titanium parts - especially notable are the most beautiful headers I've ever seen. Many consider the Eagle Weslake to be the most beautiful Gran Prix car ever built. I had the chance to see the car this summer at a historic event here and can attest to both its beauty and the amazing noise the engine makes coming out of those twisted headers. The car went straight to auction after the event and was sold for $900,000.
Road & Track Salon on Gurney's Eagle Weslake
AAR History Site
Engineering Detail