Dunnperformance has been in the machining and polishing business for over 30 years with countless hours of testing and refining of our products and processes. 
Services available are machining, Polishing, flow testing.
We sell completed setups, as well as customer supplied heads.
Dunnperformance prides itself in quality and service to the Harley enthusiast. From the novice to the pros. 
Only the finest componants are used in our performance heads.
Every set of heads I build, are of the same quality that I would use personally. If it is not right, it will not be shipped. Be assured, you will recieve the very best. Prices start at just $650 for customer supplied heads. This price includes new  manganese bronze high flow valve guides and new viton valve seals. We also do complete top end big bore kits for the 95' and 103" motors with prices starting at just $1,195 for customer supplied parts. Of course we do carry the cores which are negotiable on the price. We feature Ross forged pistons. Ross has been a leading piston manufacturer in the automotive racing industry  for over 30 years here in the USA.
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Located in Port Ludlow, Washington U.S.A.
1-303-718-7146 or