Here you will find links to select articles written by Bob Donalds of Boston Engine regararding older VWs. In the links page you will find a link to his complete writings and web site.

History of Hydraulic Lifters
Boston Bob's history of Hydraulic Lifters.
Today's Fuels, Yesterday's Engines
"The manufacturers of our 'reformulated' gas were well aware that it would not meet the needs of some vehicles."
The 009 Hesitation Blues '97
An overview of the problems encountered with a simple upgrade of the 009 distributor.
Cases, Studs, Cams and Cranks
Essential information that you'll need before you attempt a single or dual port VW engine overhaul.
So You Have a Fresh Engine and You Want It to Last
Some thoughts on how to treat a new motor.  This is on Bob's list of mandatory reading for his engine customers.
About Rebuilding The '72-'83 Air-cooled 17 + 18 2000cc Engines
The important things the manuals don't tell you about rebuilding these air cooled engines.
Type 2-4 Heater Box Manifold Installation Tips
(Or Why Does My Van Backfire Every Time I Let Off The Gas)