Talking to my son who hot rodded a Fox body Mustang a few years back I am leaning towards a 302 from the '83-'93 range for the roller cam as opposed to a 351. With your EFI system on a daily driver, I would probably recommend the E303 cam over the B303 because it has a little less "Lump" to it and will be a little more docile in traffic.Considering an engine for a new '32 build I am a fan of Ford in Ford.
However, you will find that the E303 will deliver more torque earlier than the B303 cam will. Also since there is a split pattern, the B303 is able to effectively shift the RPM band up by 500-1000 RPM over the E303 cam.ĭoes the E303 cam flatten out? Yes it will flatten out before the B303 cam will. This enhances performance in the upper RPM's for the B303 cam. The B303 loses some cylinder pressure on the bottom end by opening the intake valve 5 degrees earlier than the E303 at 5 BTC. Note that the B303 has a split pattern with a 107/117 lobe center. However, the game is played in Overlap (Lobe Centers) and opening points of the valves. Well, to some folks it would seem that the B303 cam should have the lift of the E303 cam if it were to make more power. 050Į303 intake opens at 0 BTC / closes at 40 ABCī303 intake opens at 5 BTC / Closes at 39 ABCĮ303 exhaust opens at 40 BBC / Closes at 0 BTCī303 exhaust opens at 49 BBC / Closes at 5 BTC 050ī303 Intake / Exhaust duration is 224. All measurements are taken with the consideration of 1.6 ratio rocker arms.Į303 has lobe center of 110 degrees Intake and Exhaustī303 has lobe centers of 107 intake and 117 exhaustĮ303 Intake / Exhaust duration is 220. This data from FMS catalog is not enough for me to be able to determine a HP or torque curve expectation or which cam (thus engine) I should get. So what happens to it above 4000 RPM? Does is just flatten out. That seems rather different than above specs.ī303 states it provides significant HP gains above 4000 RPM (OK what is happening below that, since it also states it has good low-end torque.Į303 states it provides significant HP gains above 2500 RPM, with same statement regarding good low-end torque. 480 lift, 284 degree duration, and the B51 (e303) has. To further confuse me, it also lists, in a following section that the B50 (b303) has. Only difference seems to be duration of about 4 degrees, which seems very little difference with them having 220-224 degrees of open, that would be only a 5% difference (I believe that is what it says?) I don't really understand what they mean by the duration (based 220 or 224 degrees) at. The FMS engines (320 HP crate motors) have same HP ratings, and same valve lift. FMS specs seem almost exactly the same (at least to me).
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