IMHO,yes. I picked up from a flat 10 mpg to a flat 15 mpg going from a stock intake with q-jet to a edelbrock RPM intake with q-jet on adaptor. 440/727/3.23 29x15x15 M/Ts
I just swapped a holley street dominator intake on it with the q-jet bolted right to intake on a 3/8" stock base gasket.
helped the bottom end torque and no more bog on the q-jet. no mpg results yet but the torque/HP was worth the change.
I will wager it does the 15+ on mpg as it just feels better over all with the little drive time I have so far.
on my SB whiplash roller cam 318/904/3.21 I went from 12+ with a LD4B/600 eddy to 17+ with the holley street dominator/6210-650cfm holley spredbore DP adding a NV4500 5 speed.
I assume it would have gained mpg with just the intake/carb swap and max gain come from the 5th gear OD.
the weiand action plus choked the 440 down at 4500 rpm and did not seem to much better than the 10-11 mpg range with the eddy 600. I did not like it on the 440 truck at all.
the RPM intake woke it up the most torque/HP across the board but the street dom seems to be better sooted to the stock 440 MH/RV cam/manifolds as far as drivabilty. rpm is a little big for a stock lopo 440 cam but does wake it up.
I have a offenhouser 360* low rise/open plane with a divider down the middle/squarebore carb flange intake to try.
rpm range from 1500-8500
supposed to have good lowend torque and mid range power for the street.
I cant see a stock cast crank lopo 440 turning 8500 rpm though?
my results and
on mpg and the stock 78 HH 440 I have to play with.
