. Click above on "Toobuilder post " to see complete reply What you said is correct, but with thousands of used engines in not just RVs, but other types of homebuilts as well, I'm reasonably confident that there are a lot of decisions made relative to engine maintenance where money causes less than optimal decisions to be made. Its true that it takes a lot more effort to adapt an alternative engine. A successful conversion places the owner/builder in a position where he can deal with any problems himself and usually at a very reasonable cost. What I would like to see here on this thread is a bunch of knowledgeable people discuss with the OP possible ways to make his project work for him rather than just tell him it won't work. When the variable cam timing was introduced, its purpose was to increase economy and help with emission control. Then the hot rod industry got involved and found ways to actually make it help produce more HP (or was it Torque). So maybe instead of saying it won't work well, and just attacking that....maybe we might encourage him to try and keep us posted on his results. Its not like he can't disable or remove it if it doesn't test out well for him.