i've been thinking of putting a cam in my truck 95 5.0 5speed MAF, 1 i need a little more low end for in town, but i also need some top end when i'm revving the hell out of it in the mud, 2 who doesn't like the sound of a cam.

anyways i've been looking at the Ford Racing E303 http://www.summitracing.com/parts/FMS-M-6250-E303/ that's got 220/220 actual duration and .498,.498 lift,

or the F303 http://www.summitracing.com/parts/FMS-M-6250-F303/ that's 226,226 actual duration and .512,.512 lift.

the E303 says its a great street cam with good idle and low and midrange power, but part of me says if i'm gonna do it do it right and get the F303 that has more midrange and top-end power. i run it wide open a whole lot more than i do doggin it. gas mileage isn't an issue it really couldn't get much worse and it only really comes out on weekends and whatnot.

i know i need to get lifters when i'm doing it and while i've got it apart might as well do timing chain and gears, let me hear some opinions on what you guys think and what else i should do while i've got it apart, thanks ahead

 

both are WAY too big....

with a lift and big tires (31s, 33s or 35s) and anything less than 4.56 gears it will be a total turd off the line and will be until 3,500 rpm...

now if you have 4.56 gears and a want to pop for a higher stall converter I;d go with the smaller of the 2...

the more duration you feed the engine the Higher the power curve starts and low end falls off...

the stock cam is about 192-198 duration...the MAX I would go would be a 216 duration...even then thats where it starts to get iffy on low end...I would opt for a 212 or 214 and even then I would Advance the cam 4 degree more than whats already ground in.....

on the ones you listed I would go maybe 6-8 degrees advance...

 

You also have to consider the cam size for the stock maf sensor and heads, not all maf cams go with maf engines, for the bigger cams you will also need heads and a larger maf sensor and improved air intake.

 

that can be worked around....but the cam is the brains...if they fall out it wont run..

you just wont be happy with your purchase if you go to big...

ALWAYS if you want off the line low end grunt go shorter duration...but if you want top end power you have to give somewhere...you cant have both unless you boost it...

 

Very interesting. How does lift play it's role? Does the shorter duration also help throttle response? It seems like it would.

 

eh thats a long post in the works...

duration just makes up where the power curve is...less duration lower power curve...more duration the higher the curve and the more radical the engine gets (with the LSA)

you best bet is to google search on cams and begin reading...there are alot of false information but some is right...but you will learn none the less...

changing the cam can change the whole engine...but most off the shelf cams are general purpose basic cams...they arent made for your specific engine set up but as a general purpose cam...

my small block cam is a real 300 duration .735 lift cam...its a real turd down low...but It need to launch at 4500rpm and will carry to 9,000rpm...with ease...but it makes 800hp on the motor alone..plus the 13.2 compression doesnt hurt either...

now i am going to build some lower end grunt and make it more violent by going smaller heads...

Just sold my fully ported 235cfm 2.08 valve heads and intake and getting some Aluminum AFR CNC ported 195s...as my little 340 cubic inch could use alittle more low end torque...prolly wont lose any HP and gain 40 torque...lol but hey thats life...lol


and I am also thinking of putting it on E85...then its going to be a real monster..

 

well considering i've already done the timing bump/ignition upgrade and i've got an opened up exhaust and underdrive pulleys what would be the next best bang for the buck kind of motor upgrade.

i'm gonna do gears before too long, the problem is i'm not gonna spend money on putting gears in the ttb i'm gonna do a SAS and if i'm gonna have it apart i'm gonna put lockers in and well you know how it goes. that's all coming when the SAS fund is looking a little better. just trying to find a decent power adder.

Cant really do long tube headers cause the 5 speed tranny. should i consider throwing a good intake on it?

 

more compression and better heads...and a slightly larger cam...

go with closed chamber heads and that will bump compression and the added cam will make a monster...

or go for broke and stroke it...