There do not seem to be many first person bad experiences with the EngineQuest heads. There are a lot of rumors floating around and many will show up here, I am sure.

Hughes Engines is on record as saying they need valve guides replaced. I don't remember anyone else saying this. But, checking guides and valve job is a good place to start with any new head.

Be aware that there is a Chinese knockoff that some try to foist on the public.

Brian at IMM (Board name: OU812) is who I would call because he sells them and installs them in customer engines.

Be aware that the exhaust flow is relatively better than the intake flow so the camshaft should be a single pattern or even have smaller exhaust lobe than the intake.

R.