hello....ok here is a VERY BASIC concept on what the lump port does and how it works(interesting enough, not only does it help the Chevy Inline 6 head but there are V-8 heads out there that have learned this concept too....it just keeps coming....)....
ok, the air that is being drawn into the cylinder is basically hitting the back wall of the port and then turning 90 degrees and going down...welllll, so does that sound like a good flow-straight to back wall then ??? down?,,,well no that is NOT good....what the lump does is add a "short" turn (radius as it is referred to) so the air kind off goes up and then down into cylinder...
it's like this.... when you are driving and a 90 degree turn comes up and the road actually has this very BAD turn you have to slow down ALOT to make turn....wellll, if there is a CURVE that smooths out this transition you do NOT have to slow down as much....again, this is a basic explanation,yet good way to explain the Lump port design...ask more questions- once you have a lump port head, you will wonder why you never had 1 and why it took you sooooo long to actually find a BIG boost in these heads and engines with these heads-of course $$$$ and priorities may not allow this.....
