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  Anyone using an X-303 cam ?

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Author Topic:   Anyone using an X-303 cam ?

Posts: 144
From: Macon,Georgia, U.S.A.
Registered: Mar 2002

posted 09-21-2002 03:52 PM     Click Here to See the Profile for MAV   Click Here to Email MAV     Edit/Delete Message   Reply w/Quote
I`d like some input from anyone using the X-303 cam . Like whats your combo and how does it perform?? Thanks alot. M.A.V.

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Posts: 1564
From: Auburn, AL.
Registered: Jan 2000

posted 09-21-2002 10:04 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
I swapped a great running B303 cam for an X cam.


1987 5.0L HO shortblock (stock + windage tray)
10.0:1 compression (cc'd it myself, so its not a guess)
Ported E7TE heads with GT40 valves & springs
Weiand Stealth Intake
Holley 650 double pumper
1.7:1 Crane roller rockers
Duraspark dist

I ran a 13.06@106 with the B cam. It was a near perfect combination (106 is pretty high). But I wanted more. I swapped in an X cam, but had some other problems with my car before I got it tuned right. Nevertheless the baseline runs I got were unimpressive. ~13.4@101. I'm sure it can go faster, but not so sure if it will be faster than the B cam. It also idles really choppy and has horrible gas mileage now (of course, if it were faster I wouldn't care ). I got about 19 mpg with the B cam on the interstate, and 13 around town. X cam gave me about 9 city.

I will be trying some 1.6:1 rockers when I get the car running again, I think my .576 lift is too much. If that doesn';t work, I'll be putting the B back in.

-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.

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Posts: 4812
From: Delta BC Canada
Registered: Dec 99

posted 09-23-2002 01:15 AM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote

I've heard that from others too, the B303 is pretty meager but works. My engine is internally stock 87 5.0L with that B303 and a Performer RPM and 84 Mustang Holley 4V. So far it seems fastest shifting about 5500 and ran 12.87 @104 today. I'm almost afraid to change cams after hearing others experiences.

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Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 09-23-2002 10:35 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
We sold a few of them and recieved negative feedback every time.
I did not recomend them for the applications they were used on.

Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"

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