After long hrs of new cuss words and throwing tools, the motor is out of my 5.0, and being it has 117k on it, i chose to replace main/rod bearings and rings than to have to do this later down the line. The point at which im at is a question about a cam. A friend has an F303 cam (.512 lift) and was interested in buying it, but according to ford motorsports i need to check piston to valve clearance. I just had my stock H.O. heads rebuilt with valve job and so forth and was told I dont have to worry about clearance problems until I get around the .540 area. Also whats the difference between stock roller rockers and the 1.6 roller rockers? Am I looking for nothing but trouble with installing this and running into clearance problems, or does ford just claim this like the child safety tags for ignorant people? Also would I need any other lifters, pushrods for this application? And will it alter its performance with a stock MAS/TB/EGR/injectors? Any help would be greatly appreciated....
I saw an F303 on Ebay yesterday for like $100.00 I almost bid on it. But then I remembered hearing bad things about the streetability of the E303, and I figured that if the F303 is one step beyond, it would really be trouble. Just my opinion.
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Pete
95 GT 5 spd. Pulleys, BBK CAI, Granitelli MAF 70mm TB, MSD ign, BBK Headers & X pipe, Rhino Cat back, Jet Stage 2 chip, 3.73's, subframe connectors, Eibach pro kit, Hurst shifter, Auto meter guages.
i dont want to spend money on springs when the ones in my rebuilt head are good, i just want to throw the cam in and be done with it, as far as streetability i plan on bolting on a supercharger next winter.. will my stock rockers work for this fine? and how much increase in power am i looking at?
I had actually called ford tech service line a while ago to aske the same questions you got -piston/valve clearance with the f303& the drivability difference between f303 and E303 here is what the guy said to me
"go with an F303 if you use NOS or a supercharger because it has a longer duration than the E
Driveability will be based on the rest of your combo, but a stock engine with either cam should run fine."
he also recommended upgrading valvesprings when changing to a cam that has hihger lift than stock.
I chose the E , have only exhaust & k&n and the car runs great, has a goood idle , cannot complain one bit.
just thought I would let you know what I know
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90 coupe - E-cam, 3.55, D&D t5, pro 5.0 shifter, sn-95 front brakes, 2000 GT wheels. 220,000 miles on stock shortblock and counting
Originally posted by Frosted Five O i dont want to spend money on springs when the ones in my rebuilt head are good, i just want to throw the cam in and be done with it, as far as streetability i plan on bolting on a supercharger next winter.. will my stock rockers work for this fine? and how much increase in power am i looking at?
If you want an alphabet cam and do not want to change anything, run a B303, That's about all you're going to get away with. Otherwise the higher lift of the other cams will overwork the stock springs, there is way too much flex in the stamped rockers to run higher lift. Eventually, the springs will wear out, best case, you red-line at 4500RPM, worst case, you start dropping valves. Same thing with the stock rockers, they will not hold their shape in those conditions.
If you are going to run a S/C, you will have to make some investments in the rest of your engine to get the most out of it.
The FRPP GT40 Springs should be okay, there are better choices. You can run stock lifters and push rods. I wouldn't use the stock rockers on a stock cam, so that's what I think of them!
92 5.0 Cam Question 
