Lobe Separation needs to be 113° or greater for SD. You could likely run less but you wouldn't likely be able to idle at a traffic light.

 

According to the specs I found stock cam had 108 degrees lobe separation so I don't know on that statement above.
Trav

 

right and both of those aren't in the price range I was wondering if the summit cam (they have a summit brand cam) had any that were computer controlled.
Trav

 

Just dig in your couch and find a few extra dollars....

You must be looking at a carb cam. No efi came with 108 lobe separation

 

That is what it says for the SYB-26 and CS-668
Trav

 

Well damn I am an idtiot. I somehow got the wrong stock specs. Glad I started asking questions.


So I put in a lobe separation of 201-210 intake and 113-115 degree lobe separation and I got:
The comp 31-255-5
the crane 36391 http://www.summitracing.com/parts/cr...view/make/ford
the melling 24209 (link to it: http://www.summitracing.com/parts/me...view/make/ford )
and the Howards cam 212001:
http://www.summitracing.com/parts/hrs-212001-14






Here is the problem the only one that says computer compatible is the comp 31-255-5.
So will any of them work besides the 31-255-5?




I am going off post #5 in this thread by conaski:
https://www.ford-trucks.com/forums/8...ml#post7965689

 

You're making this far more difficult than it is (lol)

You can try any of those cams, they're all close in spec. The risk of poor idle quality isn't worth any of the gains you might see from running them. There won't be any power difference to speak of if you were to successfully run one of those other cams, they're all too close in spec and they're all "very mild"

 

Ok so what you are saying is the only one that is good is the 31-255-5.
I guess that is what I am going to have to run because their is obviously no other ones that will work.


No wonder so many people go maf.
Trav

 

Ehhh...yea and no. People have run larger duration cams on sd....some are successful, most are not. I thought about running something more aggressive, and I absolutely would have tried if I had built a stroker instead. Larger displacement engines are much more tolerant of radical cams, while still idling smooth and pulling good vacuum. Your little 302 is not going to tolerate much cam before idle begins to throb...and vacuum drops, which would confuse the sd system. Id be willing to bet money (if i were a bettin man) a speed density 400+ cubic inch stroker, or a 460, will tolerate cams the 302 and 351 will not.

Speed density isn't so bad. You can run a lot of mods with speed density and no tuning whatsoever. Virtually any change to maf and you're back on the rollers for another tuning session. I don't know what you're build plans are for the future, but 300+ hp 351 is pretty simple and dirt cheap with speed density. I haven't gotten a chance to dyno mine...I've been working on the rest of the truck and other projects. I will be getting onto the rollers, and I will be highly disappointed if I'm not handily over 300 at the crank, or 250+ at the wheels. Just food for thought.

 

Well my future build I am hoping for 350HP-400HP with a good amount of torque and possibly stroking it I am not sure on that part.
Trav