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Old 04-17-2009, 11:48 AM   #1 (permalink)
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e303 vs b303

Ok so heres the deal. I thought I measured my valve lift at what stock would be in my 89 gt which was weird as its slightly lopey at idle. I have bought brodix st heads with 1.94 /1.60 valves and also got an e303 cam. I figured i would install them both at the same time. I took apart the motor today and it turns out there is a b303 cam installed. Which cam would you guys recommend running with this setup: Carbureted 306 with edelbrock rpm intake, brodix st heads, bbk headers and x pipe with flows. It has an aod trans, possible mild stall converter. I dont get to the strip and mostly drive on the street. The lopey idle was cool but I dont care either way. I heard the b303 had a wierd power band and made its hp up high, which might not be so good for me on the street. Thanks for any input.
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Old 04-17-2009, 12:45 PM   #2 (permalink)
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Re: e303 vs b303

From what I understand, the E-303 has less duration and is ground on a 114 LSA While the B-303 is on a 112 LSA. I believe the lift numbers are the same. But the B has 224* duration @.050 but the E is 220* duration at .050 lift. I am sure someone will correct me if I am wrong. My choice would be the E cam, a little better street manners and no real loss of H.P. especially with a auto trans.
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Old 04-17-2009, 03:27 PM   #3 (permalink)
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Re: e303 vs b303

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Originally Posted by Bullitt331 View Post
From what I understand, the E-303 has less duration and is ground on a 114 LSA While the B-303 is on a 112 LSA. I believe the lift numbers are the same. But the B has 224* duration @.050 but the E is 220* duration at .050 lift. I am sure someone will correct me if I am wrong. My choice would be the E cam, a little better street manners and no real loss of H.P. especially with a auto trans.
Bullit331, you are right about the B-303 cam having 224 duration vs E-303 cam's 220. But B-303 cam has alot less lift(480 lift at .50) vs E-303's 498 lift.
In wich i agree with you that E-cam is a better choice. Better drivability and
I think better HP. Like i said before,my homeboys coupe with stock shortblock
E-cam and AFR 165's,Edelbrock RPM2,70mm TTB made 320 at the tires.No bull.Ofcourse,with 1 5/8 longtubes, H pipe and Flow's.
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Old 04-18-2009, 08:43 AM   #4 (permalink)
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Re: e303 vs b303

I agree, but I would not call .018 "a lot less" or a lot more of lift. (.480 to .498) It is not really the lift of the cam that makes the power but WHEN and FOR HOW LONG it is open that makes all of the difference. If you look at flow stats of cylinder heads,(any cylinder head) you will note that the vast majority of intake or exhaust runners make 80% of max flow by only .400 lift. compared to max lift of over .700. That being said, I think that is the reason the E cam is a "better" street cam. It also works great in boosted applications.
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Old 04-18-2009, 10:27 AM   #5 (permalink)
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Unhappy this is very useful

Wow, this is very useful.. Thanks for sharing this and hoping I could implement it too.
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