srl135 said:the purpose of the acid dip was to basically bore out the intake manifold for a higher flow rate for better hp. The hone and the acid dip both did the job and as i have understood it..did it equally as well. The honed is just boring out the whole manifold with an actual machine or CNC. same job just one chemical approach and one machining approach.
to clear up the misinformation...all acid dipping is going to do is remove flash, sort of help "smooth" the surface...
in addition, extrude hone is not a machining operation....they basically take a fixture plate that has an opening the same size and shape as the part, this bolts to a large pump...then they pump a "sludge" through (usually silica and sand, w/ water, sometimes diamond dust, depending on the hardness of the material being extrude honed)...this abrasively removes material from whichever passages the "sludge" passes through...this works well for intakes in that most of the areas have good transition, without abrupt changes in direction, since extrude honing will wear any protrusions into the path of the flow faster than the walls...just FYI...carry on...