Looking at the 3.9lt multi point & 4.0lt multi point there is a power difference of 9Kw.......???? Is this from the different cam timing. The 3.9lt cam has timing overlap between intake & exhaust values of 28 degrees, while the 4.0 has an overlap of 30 and the XR6 cam 32....Obviously this helps to create a scavenging affect that sucks more fuel mixture into the pots....
question....considering the value springs, cam journals are the same for the 3.9 & 4.0, has anyone put a 4.0lt cam into a 3.9 - if so did you notice an improvement or is it a waste of time????
mick
question....considering the value springs, cam journals are the same for the 3.9 & 4.0, has anyone put a 4.0lt cam into a 3.9 - if so did you notice an improvement or is it a waste of time????
mick