OST-013: Massaging a virgin ;)

[Bean]

great work Dan - looking forward to put it to use.

@NoHachi: if you look at a stock 4age head (and loads of other heads too) you'll find that the casting from the ports doesn't line up with the valve seats, resulting in a sharp lip/step between the two which is very pour considering good flow.

to illustrate it from above picture (this is the #2 combustion chamber pre work)

if you look at the lower two ports (intake) you can see a shadow on the top portion of both ports below the valve seat where as explained the seat and port don't line up as they should, creating a lip.