Factory Magnum Heads

DodgeFreak said

Does anyone have an idea why on the intake side they put that bump in the port?? Whats that for? Also besides the stud rocker arms would the TBI heads be better than magnum heads as they still have the swirlport also?? From what i've got with this people should keep the heads the same and spend the money to convert magnums to the LA heads if the la's flow better than the magnums anyways. Can you do flow numbers on the TBI swirlports as a comparison?

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I believe the bump your referring too is because one of the head bolts is above it and the extra material (bump) is needed for strength. I found that out the hard way the first time I ported a set. Went through and had to have it welded up. You can smooth it down but don't take any more off than necessary. I don't know flow numbers for the earlier swirl port heads so I don't know if there is an advantage there but the magnums have closed chambers which is an advantage. It will tolerate more compression ratio than open chambers do.