4-7 swap cam

k9

Dragway Regular
May 22, 2003
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Are these cams worth the extra money? Any good or bad experience with them?
 

boyzbad

Top Fueler
Jul 28, 2004
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Olathe, Ks
I'm not sure how much extra money you've looked into but, Cam Motion is by far the cheapest. I'd splurge for anything over 500hp imo.
 

ILLEGAL REGAL

MalibuRacing Junkie
Jan 1, 2005
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What I've heard is maybe a couple hp, but not worth it. I guess it's more for taking stress off the crank, but then moving it another place.
http://www.yellowbullet.com/forum/showthread.php?t=15115

you can also do the 4/7-2/3 swap that is the lsx firing order and 302ho/351 firing order.
 
A

Anonymous

Guest
comp told me when i ordered my cam that anything that runs high rpm it is worth it (above 5500 operating range) due to harmonics and less stress on crank shaft

they also claimed it is worth about 15hp when running a high rpm race sbc
 
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Anonymous

Guest
k9 said:
Are these cams worth the extra money? Any good or bad experience with them?
Well you ask ten people and you will get ten different answers on this. It really has a lot to do with your combo. Your intake and headers play a HUGE role in getting the extra power from them.Sort of like what an X-pipe dose. If its put in the right place it makes power, but if its not you stay the same or lose a little bit. I have a 7-4 swap in my 572. Pro Stock,Nascar,Irl have used them for years and they are centainly worth something in the right app. I would say in a well thought out combo carb. to headers its worth it, but to just try one because its a swap cam it would be money better spend else where.
 
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Anonymous

Guest
Big M Motorsport said:
k9 said:
Are these cams worth the extra money? Any good or bad experience with them?
Well you ask ten people and you will get ten different answers on this. It really has a lot to do with your combo. Your intake and headers play a HUGE role in getting the extra power from them.Sort of like what an X-pipe dose. If its put in the right place it makes power, but if its not you stay the same or lose a little bit. I have a 7-4 swap in my 572. Pro Stock,Nascar,Irl have used them for years and they are centainly worth something in the right app. I would say in a well thought out combo carb. to headers its worth it, but to just try one because its a swap cam it would be money better spend else where.
yah what he said ^ :D
 

k9

Dragway Regular
May 22, 2003
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I agree. Everything doesnt work for everybody
 
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Anonymous

Guest
One of the monthly rags did a comparison on this within the last year & a half. (Sorry I can't recall which one though)

They ran a SBC on the dyno & then swapped cams as quickly as possible. I'm fairly certain they were Comp Cams. Both cams had the same specs just swapped the firing orders.

In this instance, the 4-7 cam produced 10hp more.
 

CutlassRacer

MalibuRacing Junkie
Dec 18, 2004
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Remember that articles in magazines only say what the companies giving the products away want them to say! ;) It all revolves around the advertising dollars.
 
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Anonymous

Guest
If the *B* core (4/7) makes more power it is because of its proximity to the water pump. you have more cool water for 2/4 than you do when you fire 5/7 at the back. The *C* core (ls) does sound smoother and might have a better acceleration rate depending on your intake design. If you got the cash buy it it definatly won't make less power. BUT just like rod length there are a lot better places to find power.
 

Excelerater

MalibuRacing Junkie
May 22, 2003
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I would say its worth it since
every high end pro engine builder pretty much
uses them on every motor these days.........


I wouldent buy one for a 500 HP streeter
but I would for something I regard as serious
 
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Anonymous

Guest
The 2 that I usually go to at Comp Cams told me to save the money. In a well-thrashed 500" Pro Stock engine they may be worth 5 HP. They may smooth the idle a bit but certainly nothing measurable for most of us. I had other places to spend the money when I got the cam.
 

ILLEGAL REGAL

MalibuRacing Junkie
Jan 1, 2005
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Tinley Park,IL
I was talking to a pretty known engine builder today about this.. he said he got into detail with the "c" order cams with a couple different companies and they told him they shouldn't be used in high rpm race engines, but would make better midrange power than the other firing order cams.

I nor he could understand why that is..
 
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Anonymous

Guest
If you draw a top view of a engine and go threw the firing order both ways its easier to under stand. The 4/7 swap moves the two cylinders firing one after the other to the front of the engine. What this dose is help keep the air/fuel charge off the back runners and more in the center of the intake on a car that is going down the track. You can't see that on a dyno. That is why I said the intake and headers play a big part in getting the extra power. Also if you look at it you will see that after #4 and #2 fire #1 is next inline. Pushing on the same end of the crank there is no deflection to eat up some power. And like Bigtime said the cylinders are closer to the cooler water coming in and that can't be a bad thing either. There is a mad science to it and by no means do I know most it. Just try to sneak a peek at a NHRA Pro Stock intake at a race and see how far you get. Thats about the only thing you will never see in the pits! Even their spare is under lock and key in the trailer! :shock:
 

Hotrod1451

Daily Driver
Jul 2, 2010
39
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essington,pa
If your building it from scratch then go for it.
I know 3 people who all switched from what they had during a freshen up to the 4-7 swap and nothing changed.
The cars ran the same.
 

LS6 Tommy

MalibuRacing Junkie
May 15, 2004
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Back when there was only the BBC & SBC, GM tested extensively & found INCREASED harmonics on both, with little to no gains. Now that they've started over from scratch, the LSx engines do use the swapped firing order.

Tommy