i decided which cam i am going to get for now until i save up enoug for the rest of the build i am getting comps CL35-255-5 cam i was going to get there CL35-235-3 cam but summits tech said they wouldnt recomend it on a efi motor event tho i know a guy who has it and it has that cool cam thump to it. my question is will the first cam i listed give me the same sound? i know in has more intake lift and duration but less exhaust lift and duration. i should also say for now all this truck has is a cold air intake headers and dual exhaust and its a 95 351w in a f250

 

That 95 block should be a roller block shouldn't it? It looks like you've selected a flat tappet cam.

 

being a 95 block it's a roller cam.. that first cam is a Flat Tappet..

the cam is ok for a speed density system. it's a fairly mild idle..

the second cam has a 111 lobe seperation and 218 exhaust duration at .050 lift... thats a fairly rowdy cam..



so no.. they wont sound the same.. probably be easy to look up the sound difference on youtube..

 

i like the second one the most but summit said if i get the first one it will work with the stock computer

 

I'll be perfectly honest here. Seeing that Summit is recommending a flat tappet camshaft for a roller engine, you might want to stay away from their recommendations in this instance. I order from them regularly and I think they are great, but they are sending you in the wrong direction regarding camshafts.

I am assuming your truck is mass air equipped, so you should have some flexibility.

Also, since you have a 351 and this is a truck, I honestly don't see many off the shelf cams that would work (properly) and you should go the custom route to get what you want.

Another option is to take a look at aftermarket 302 HO firing order roller cams since they will fit, but the extra displacement of the 351 will possibly tame the idle down, which is why I'm suggesting to go the custom route.

One last thing to consider is that camshafts with the lopey idle will probably make your truck a bit sluggish on the low end since trucks are much heavier than cars. This is yet another reason to go the custom route.

Just my .02 for you to take into consideration.

 

If I had a 351 roller block in a truck and absolutely had to go with an off the shelf camshaft, I'd probably go with Crower 15511 or Comp Cams 35-514-8. Neither are what I'd consider to be a perfect fit, but they'd be close enough. My concern with the Comps camshaft in this instance is that the rocker arms might not have enough clearance and bind due to the lift. You'd have to check that and possibly get aftermarket rockers if it does bind.

 

Idk wjy flat taped are bad they used them for years and they use thim.in big drag motors so it doeant matter to me if it is and i work with a guy who use to buil drag motors and he said it doesnt matter u just gain like 5hp mkre from a roller which in a truck idt youd notice but tht cam is build for off road muddin and is built for bottum end and.mid power so how wud i be slugish off take off and its a truck anyway so its not like ill be drag racing anyone. The only question i have is wud cam CL35-231-3* be a better choice

 

Motor oil changed over the years and "big drag motors" don't use off the shelf motor oil. They use special motor oil high in extreme pressure additives. You might be able to get away with using diesel motor oil, but if you live somewhere that gets cold during the winter, that might cause a problem.


I disagree.

True it's built for bottom end, but what I'm saying is that generally a lopey idle will cost you on bottom end and that it shouldn't be considered because it's a flat tappet camshaft. If it works for your buddy, give it a try.

As far as better, take a look at the specs on your stock cam first and compare the two. Flat tappet specs are generally much milder than roller cam specs, so what you don't want is a lateral move.

Also, one more thing to consider is that you'll need to either change the distributor gear or entire distributor if you go from a roller to a flat tappet. You'll need longer pushrods as well.

If you are dead set on the camshaft (which is sounds like), go for it, but I don't think it's much to be gained horsepower/torquewise in my opinion. I might be wrong, but that's just my opinion. What I'm saying is that I feel like you're moving backwards going to a flat tappet.

You could probably get a used 5.0 HO camshaft (preferrably from the 86 to 88 years) and advance it 4 degrees and probably come out better (and much, much cheaper).

 

All im saying is tht according to summit i have to use a computer compatable cam and the only one they have is a flat tap so thts what i.went with does being computer compatable even matter? And im thinkin about saying screw efi and putting a carb set up it will be 1200 cheaper to build it with carb than with efi but idk if ill do it or just build a carbed motor for the highboy.

 

Could there*35-512-8 cam