Posted by Gary Stewart (76.188.57.236) on October 07, 2009 at 17:50:08:
In Reply to: Re: Re: Wisconsin air cooled AHH vs AHHD posted by Tim Devlin on October 07, 2009 at 15:21:56:
the 2 engines are the same with the exception of the exhaust valve. The Stellite( which is a trademark name ) valve is used for high heat applications such as generators and pumps that run a long period of time. It is a more expensive and longer lasting valve. You cannot tell the difference of the 2 engines by looking at them.