Quote Originally Posted by Mykk View Post
I'm using a XR276HR-10 in a .040" over 350ci, vortec heads, 10.7-1 static compression, RPM Air-gap, Speed Demon VE 650cfm. With a 4L60E trans, no loading up or drop in manifold vacuum here.
Are you also using an MSD Ign System ? How much Vacuum is your Engine Pulling ?