Gm847

[white97z28]

Where can i find a gm847 cam for my car? I have been looking everywhere and i can't seem to find where they are sold.

[craig62989]

this guy makes custom cams and has one that says to be comparable to the 847

http://www.elliottsportworks.com/lt1.html

236/240 .592/.592 112 LSA - 2400-6600 RPM Very choppy idle. Good mid range and great top end power. We suggest a "built" bottom end
is to handle this RPM. Minimum 3000 stall and 3.73 gears for F and Y body. More gear and
stall will be even better. Comparable to GM 847 or Comp 468 XFI cam.

[white97z28]

Thanks...but i thought with the gm847 you dont have to build your motor? i mean besides upgrade your heads (springs,etc...)

[JoeliusZ28]

you dont have to, but with a cam that wants 7k RPM dont be surprised when your bottom end says "no thanks."

[Boost Addict]

Im pretty sure the 847 was ground by Crane for GM. I have the exact same specs of the cam butbought it from Crane not GM

[white97z28]

you dont have to, but with a cam that wants 7k RPM dont be surprised when your bottom end says "no thanks."

Well I've just heard that the gm847 cam works well with stock bottom end...are there any other cams that i should take a look at?

Im pretty sure the 847 was ground by Crane for GM. I have the exact same specs of the cam butbought it from Crane not GM

ya i know crane makes them but i cant find where to buy it at.

[meissen]

Honestly - what's the reasoning that you want to go with the GM847 in the first place? Are you just going with the biggest cam to have the biggest cam or are you planning on it being a strip car and no longer a street car? I have the CC503 and it's one of the popularly recommended cams. The bigger the cam, for the most part, the more bottom end you will lose. So while the GM847 is going to be great on the top end, it's going to be a dog in traffic.

[white97z28]

Well im really just looking for a street/ strip car i really want more of a bottom end power and i guess i really don't care if its big or not i was just hearing good things about the gm847...How much do you like you cc503? What kinda power are you making and what supporting mods have you done? I was looking at the cc306 to but that is supposedly like the gm847.

[meissen]

What you'll need to do is find a cam with a better RPM range then. While it's not universally the case (or maybe it is?) what I've always understood is that the bigger the cam is the more bottom end you're going to be losing because it's going to be performing in higher RPMs. I love my CC503 and it feels like it has great grunt all around. The CC503 or a comparable custom grind cam from Comp Cams, Lloyd Elliot, or Advanced Induction (in no particular order) seem to be the real popular ways to go.

In my particular case, my HP numbers might not be 100% accurate because I had a faulty fuel pump that was dropping to 20psi and giving me a real lean WOT, but I was like 325 hp, 322tq. 30# injectors, upgraded springs, 1.6 roller rockers, heads have the bowls ported, hardened push rods, LS7 lifters, custom stall from Mike Ridings, 4L60e rebuilt by Ridings as well. While the videos won't tell you much of anything, I've got a ton of videos on youtube: http://www.youtube.com/mifbody

[JoeliusZ28]

if you want bottom end power you dont want to be looking at a cam with 240+ duration.

if you really want to learn about cam specs, read the sticky i posted in the intake/exhaust section.

[Plantfoam]

Yes, bigger is not always better when it comes to engine components. If you need to use a 3000 stall, then you probably don't have a street friendly car anymore. You will almost never be in lockup, unless you are going at freeway speeds with high ratio gears...but that isn't really desirable either. That's why I took a look at what converter I would have to use when I was shopping for a cam....that gives a good idea of how the car might behave, depending on your application.

[DETROITMUSCLE]

Yes, bigger is not always better when it comes to engine components. If you need to use a 3000 stall, then you probably don't have a street friendly car anymore. You will almost never be in lockup, unless you are going at freeway speeds with high ratio gears...but that isn't really desirable either. That's why I took a look at what converter I would have to use when I was shopping for a cam....that gives a good idea of how the car might behave, depending on your application.

a 3000 converter is no where near undriveable, who the hell is tuning your guys cars? I daily drive a big cam and 4000 stall converter and my car drives very very well. With a tighter 3500 converter you'd never even notice any difference from stock.

[meissen]

My 3400 converter is perfectly fine around town.

[MunsterZ28]

6speed ftw

cc503 is a good cam id say.

[ThreeHonks]

6speed ftl

fixed