E303 vs. F303
New User
Joined: Apr 2021
Posts: 1
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The E303 will have better street manners than the F cam will. I have a B303 in mine and I'm not sure how I'm going to like it daily driving, but if I don't like it then I will just swap to the E303 or a Comp cam and call it a day.
taisa899 and Lew, what do y'all run in the 1/4? wondering if my f-150 or my PSD will keep up with y'all.
taisa899 and Lew, what do y'all run in the 1/4? wondering if my f-150 or my PSD will keep up with y'all.
Logistics Pro
Joined: Aug 2014
Posts: 3,508
Likes: 824
Main reason, is the power curve starts earlier for the e303. Depending on other engine parts, the b303 power curve is moved higher up in RPM by 500-1000 compared to e303.
Here's some good info form 2003, 7 years earlier than the last post of this thread:
credit to the above goes to: https://www.ffcars.com/threads/enlig...9/#post-583195
Here's some good info form 2003, 7 years earlier than the last post of this thread:
The specs on the cams are different. All measurements are taken with the consideration of 1.6 ratio rocker arms.
E303 has a max lift of .498
B303 has a max lift of .480
E303 has lobe center of 110 degrees Intake and Exhaust
B303 has lobe centers of 107 intake and 117 exhaust
E303 Intake / Exhaust duration is 220 @ .050
B303 Intake / Exhaust duration is 224 @ .050
E303 intake opens at 0 BTC / closes at 40 ABC
B303 intake opens at 5 BTC / Closes at 39 ABC
E303 exhaust opens at 40 BBC / Closes at 0 BTC
B303 exhaust opens at 49 BBC / Closes at 5 BTC
-----
What does all this mean?
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. However, the game is played in Overlap (Lobe Centers) and opening points of the valves. Note that the B303 has a split pattern with a 107/117 lobe center. The B303 loses some cylinder pressure on the bottom end by opening the intake valve 5 degrees earlier than the E303 at 5 BTC. This enhances performance in the upper RPM's for the B303 cam. 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.
Does the E303 cam flatten out? Yes it will flatten out before the B303 cam will. However, you will find that the E303 will deliver more torque earlier than the B303 cam will.
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.
E303 has a max lift of .498
B303 has a max lift of .480
E303 has lobe center of 110 degrees Intake and Exhaust
B303 has lobe centers of 107 intake and 117 exhaust
E303 Intake / Exhaust duration is 220 @ .050
B303 Intake / Exhaust duration is 224 @ .050
E303 intake opens at 0 BTC / closes at 40 ABC
B303 intake opens at 5 BTC / Closes at 39 ABC
E303 exhaust opens at 40 BBC / Closes at 0 BTC
B303 exhaust opens at 49 BBC / Closes at 5 BTC
-----
What does all this mean?
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. However, the game is played in Overlap (Lobe Centers) and opening points of the valves. Note that the B303 has a split pattern with a 107/117 lobe center. The B303 loses some cylinder pressure on the bottom end by opening the intake valve 5 degrees earlier than the E303 at 5 BTC. This enhances performance in the upper RPM's for the B303 cam. 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.
Does the E303 cam flatten out? Yes it will flatten out before the B303 cam will. However, you will find that the E303 will deliver more torque earlier than the B303 cam will.
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.
Junior User
Joined: Aug 2010
Posts: 92
Likes: 4
All of this info makes me happy. I'm currently putting a 351 Windsor together with an E303 roller cam. I've got a 96 F-150 4x4 auto with stock EFI and MAF and was hoping the street manners will be bearable. Bottom end is being bored .030 to clean up and I've got a set of Pro Comp aluminum heads (190) the E303 cam and I'm staying with the stock EFI for now. Has anyone ran something like this? Good or bad? I have shorty headers but contemplating doing long tubes and dual exhaust. Gonna keep the EGR system for now. Thoughts? Tips? Help? Would it be best to get some custom tunes for say an SCT? This is my daily and my favorite truck
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