Dom, when I dynoed the 434 the guys at the shop asked me what air filter/air cleaner I ran. I run a K&N 3" filter with the filter top, The dyno operator pointed to an AllStar top and base and told me that is what I need to run along with a Wix Racing 4" filter. He said for some reason the filter top really messes with the afrs on a 4150 Holley, not so much on a dominator. Think I'll order one just see.
I have dyno tested the K&N extreme filter tops on two different 440 motors on two different engine dynos, both motors lost 8 HP
I tried switching the lid with the same Extreme filter top at the races with a 440 motor in a 1971 duster with a six pak scoop and the car went .03 quicker ET and .2 MPH faster on back to back to back A-B-A testing
We race cars, not dynos
And Cab I would bet you were running rich on your
A test and it leaned up with that lid... I have
one also.. I put it on and my engine goes lean then
the injection recovers for it.. I have it on the data
logger.. I was planning on the dual snorkel like is
shown in the one post.. that way I dont have to build
a tray for my cowl which is almost done.. but would
look like crap mounted to the bottom of the hood...
that top messes up the flow going into the carb
coming in from 2 directions... I did some flow
work on that style back when I was working in the
lab
EDIT
I said this backwards.. you must have been lean on
your A run..
