Quote Originally Posted by Mike Mackaman View Post
Two thoughts on this:
1. Doesn't the fact that the 240 and 260 come factory with a velocity stack pretty much allow us to do whatever we want from the velocity stack standpoint as it is a replacement?
2. Playing around with a piece of string on the flow bench, what is more than 1-2 diameters in front of the openning doesn't even come into play. Several diameters to the side does however, even with a velocity stack. This may give you some direction to make sure you are ok.
Mike

1. Not according to National Tech last time I asked ('course that was years ago). If you want to use stacks on a Z you need to use the entire stick backing plate according to them. Can't even cut out the stacks and use them, whole backing plate only.

2. True. You'd really want a big radius bell shape, not the tight radius sharp edge of the stock stacks.