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Author Topic:   Motorsport F303, X303 cam
cpmaverick
Gearhead

Posts: 1602
From: Auburn, AL.
Registered: Jan 2000

posted 11-18-2001 07:32 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
I can get a pretty good deal on either of these cams F303, X303, would they significantly improve my performance? This is my only car and daily driver but I'm willing to sacrifice more drivability for a significant top end gain.

I'm specifically thinking, will the RPM range raise so much that my stock bottom end won't hold up, and will my dual plane intake flow enough for these cams.

My specs:

1987 5.0L HO, stock bottom end w/Boss 302 windage tray
E7TE heads, ported with GT40 valves & valvetrain
B303 cam
1.7:1 Crane Energizer roller rockers
Weiand Stealth intake
Holley 650 DP (might go to a 700)
Headers

Car is a stick with 3.70:1 gears, and trips the scales at 2990 lbs.

------------------
-Charlie Ping
1970 Maverick Grabber
[email protected]
Daily Driver
http://www.maverickgrabber.com

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2001 11:49 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I prefer the X-303 for your application Charlie.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 11-19-2001 03:02 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
a lifter munched my e-303 and i got an f-303 and i havent been impressed. think the car felt quicker with the e cam but never got to run it with my current setup to compare. other people claim to have had better luck with this cam than my experience. next cam i get will be a comp cam custom grind and will need flycutting the pistons im sure.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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cpmaverick
Gearhead

Posts: 1602
From: Auburn, AL.
Registered: Jan 2000

posted 11-19-2001 11:49 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Thanks for the replies.

Now, the question is, will my stock pistons kiss the valves with the higher lift and 1.7:1 rockers?

Unfortunately, the answer is probably yes

But its worth a try; all I have to do is pull one head to find out.

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 11-20-2001 06:16 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
You should have adequate clearance with the X-303 and 1.7 rockers Charlie.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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cpmaverick
Gearhead

Posts: 1602
From: Auburn, AL.
Registered: Jan 2000

posted 11-20-2001 11:52 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Well, I have 10 thousandths shaved from my block, and a small amount shaved from the head. I hope they do fit.

However, I have been brainstorming ideas to check for clearance.

The contact would occur during overlap, right? So wouldn't it be possible to measure valve depth during TDC overlap with a dial indicator and then remove the rockers, springs and retainers and measure valve depth before contacting the piston? I'd like to not remove the heads.

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ragtopjr
Gearhead

Posts: 2447
From: Saskatoon, Saskatchewan, Canada.
Registered: Oct 2000

posted 11-21-2001 12:36 AM     Click Here to See the Profile for ragtopjr   Click Here to Email ragtopjr     Edit/Delete Message   Reply w/Quote
Charlie I used an x 303 cam in my last motor and loved it, you can see the combo here http://ragtop-racing.stangnet.com/whats_new.html
The motor was plagued with bad bore's yet ran very strong.
Good Luck

------------------
Ed
Heart mods:Trick High flow titanium valve ported & polished Listen close: "tic tic tic" No folks thats not a noisy lifter thats the sound of big flow!
1984 5.0L LX Conv 3600 lbs 13.41 at 101.89 SIR
http://ragtopjr.hypermart.net/
http://ragtop-racing.stangnet.com/
http://mbmustangs.tripod.com/index.htm

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cpmaverick
Gearhead

Posts: 1602
From: Auburn, AL.
Registered: Jan 2000

posted 11-21-2001 03:10 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Nevermind, I already figured it out! Thanks for the info ragtop.

[This message has been edited by cpmaverick (edited 11-21-2001).]

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