Quote:
Originally Posted by moggey01
The downleg booster sits lower in the venturi. Most all builders use a "Y" drill to check the size. A lot of guys use the HP series metering blocks so they can tune the emulsification and effect the tuning that way. It is worth some power .
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I love the HP blocks, They have a longer usable main well and usually 1 or 2 extra e holes. It's also a nice trick to plug the factory power valve channel and drill another one right under it. The stock location actually comes in and misses the first e bleed. By drilling under it, you can get the full use and benefit of the main well and e bleeds for better atomization. Drill and tap them for 6-32 and install some changeable bleeds and really get that curve where you want it.
Bottom block is an HP where as the top one is the standard double pumper rear casting.