I've heard good things about Jake Raby and his work on Type IV engines. He is located in Georgia.
www.aircooledtechnology.com and
www.massivetype4.com
If you are ever in the area (Springfield), stop by and we'll take the Bug for a spin. I have easy 495 Beltway access from Telegraph Road.
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Jim Gerock
BMWCCA # 381868
73tii "Celeste" # 2764081
71 VW Bug