Little info to report about the 4-hole spacer! Threw it on the 440 before taking it down to the Harper Cruise tonight...the motor didn't seem to like it at lower RPM! It was stumbling a bit...up to around 1800-2000 rpm. Maybe it didn't like the 35 squirter...where the 35 works good with the open-hole spacer! Not really sure! What do you guys think? BTW...Brad..Raff's correct!..that's his modified 850DP in the pic. I'll post one of Russ Dudek's 950HP.