Quote:
Originally Posted by RussMcB
Do the heads need to come off to match them to ported IH's? Or do people do it with the heads in place, and maybe stuffing greased rags into the ports to catch the swarf?
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yep, rags and blue paper towels...also I rotated the engine to ensure the intake was closed on the primary port that was being worked on. I left the secondary ports alone.
recently results have been posted that port matching the head isn't really all that much better just so long as you open up the plenum and injector housings. I suspect the head porting helps more when the entire head is ported. Anyhow my observation is that you will lose nothing and all hp gains are all top end over 5000 rpm. Additionally if your exhaust system is stock or generally restricted, this mod doesn't help nearly as much as it does with the other mods in place.