e129745

Has anyone run a 350 with around 224/230 Deg. Duration @.050 cam under Performer #3711 intake and then Performer RPM #7111? I am building a package and can't decide without putting out the $ and try both for myself.
It's a 68~ Cutlass Supreme ~3500lbs. I ran the 3711 with a hydraulic flat tappet Engle (Mondello) #JM 20-22; In. .496"/226°@.050, Exh. .512"/230°@.050 with 110° separation angle. 9.25:1 static compression. 3.08:1 rear axle and 12" convertor stalling around 2200, pretty tight coupled to a TH400.
Now I`m building new motor for same car and running gear, but this one has a Comp hydraulic roller cam; In. .536"/224°@.050, Ex. .544"/230°@.050, also with 110° separation angle and has tighter quench distance at .038 and 10:1 comp. ratio.
I enjoyed excellent throttle response and feel. seemed to have lotsa low end torque and idled low, 550 PRM easy and 10" vacuum in drive. I don't want to loose the low end feel by going to the 7111. I don't race this on a straight track, rather road-race style. I understand the specs for the manifolds and the 3711 points to a cam with a duration closer to 210-215°. The RPM calls for 230-240° duration cam. I attribute the higher than expected vacuum at idle and excellent crispness to the smaller cross section/volume runners of the 3711.
Anyone with real world experience?

captjim

The RPM should be fine. I have had it on much milder engines and it was OK. Right now I have a 10.25 to 1 355 with a 227/233 cam with an RPM and 770 Holley, it is very crisp and responsive.