Motorman

I have a 1993 ford F150 4X4 4.9L. I wanted to know how much of a upgrade cam I can install before it messes with the EMC. I have a high flow exhoust, a twin 60 mm throttle body, a jet pro chip and 17lb/pr.hr. injectors. Less than 20K on the motor
I was thinking this cam.

Comp Cams Hydraulic Flat Tappet, Advertised Duration 260/260, Lift .447/.447 lobe separation 110 Degrees RPM range 1K-5K

Or even better this cam.

Crane Cams Hydraulic Flat Tappet, Advertised Duration 272/284, Lift .487/.515 lobe separation 112 Degrees RPM range 2K-5.5K

Any body try camming this motor with the fuel injection installed?
Any body know if the computer can handle it or do I have to do a carb conversion?
Also with either cam will the rocker arms punch the valve cover since it has a low spot for the intake?

Thanks for any help.

rikard

I'm not sure that either cam would work with the SD computer but the 260 would be my choice. The head will need some porting to take advantage of the cam. The timing set should be changed to an all metal one and its retarded 4 deg as installed for emissions, so you may want an adjustable one. I would also upgrade the rocker system also. Check out the Ford section over at the inliners performance site.
regards
rikard

dr_bowtie

leave the cam alone just advance it +4 degrees... it will come alive

nauss85

I have to agree with rikard, the 260 would be max I would do. Unless you have upgraded your head hardware, you could bottom out the vlaves before the cam opened fully and run risk of snapping push rods. If you have porting/polishing done to it as well, it would greatly improve the flow to take advantage of the cam...