B303 VS X303 Camshaft

[mdauth]

Anybody have experience with these cams. I have a 302 HO (1987) hydraulic roller with aluminum heads, dual plane intake and a 650 Holley carb, the rest of the motor is stock. I’m looking to upgrade my cam for either the ford B303 cam witch I just slap it in or the X303 and need to notch my pistons. I would like to know the HP gain from one to the other and also by notching piston I will bring my compression ration down and what effect will that do to my HP. Thanks for your feedback.

[zrayr]

I would call the folks selling those cams over at

http://www.fordracingparts.com/home/home.asp

they will be happy to provide the details you want and more.


Ford Racing Performance Parts
Dearborn, MI
www.fordracingparts.com
Tech Hotline : (800) FORD788

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Z. Ray

[4into4]

I've run both. Not great cams for performance, though they do have a nice sounding idle. The X cam is essentially a B with a little more lift. I put in a Comp Cams "Thumpr" ( 227/241 duration. 531/515 lift )hydraulic roller and it feels like I picked up 30 horses over either of the Ford cams, not to mention the nasty idle. I've read that our SBF engines favor a split duration cam, and I'm a believer. Here's a video clip of the B303:



And the Comp Cam: ( rattling noise is my air cleaner not tightened down )



THe best is a custom grind from someone like Ed Curtis.

[mdauth]

Thanks for the info, I like the sound of that comp cam.

[Prof]

Thanks for posting this question. I am having Keith Craft assemble my roller 331 SBF and all the parts are due at the Plano TX location within a week. Dallas Mustang had a X303 on the shelf, so that's what I went with. I have a Thumper grind in my '50 street rod Chevy pickup (also SBF) and it revs freely without thought. I am going to call CompCams Monday morn and get one coming my way. In my opinion, the grinds are nearly identical. THANK YOU for posting the duration/lift numbers in your reply. Makes things go faster on the phone.
Paul May
Dallas TX

[mdauth]

What kind of pistons are you running, I called compcam today and they told me that I need to change my pistons to run a thumpr cam for clearance. Notching my original ones will not give me enough clearance, they told me to use a compcam P/N 35-351-8. thanks Mike

[4into4]

I'm running TRW flat top pistons. They have pretty generous valve reliefs. Lots of clearance with .531 lift and 2.02 intakes.