Heatmaker

Ai

I think that gm847 works pretty well & we've had good results in the past with it (including Waswa's up there). With a good tuner, I've yet to have a customer think it was too much for a daily driver from a driveability standpoint. Of course these are manual cars, and we aren't taking into consideration the relatively rough idle - but some of us enjoy that sort of thing

neil350

I have rode in an 847 cam car and with both cut outs closed and a plate in the Borla, its very tolerable, I have ridden in much worse.

badblackta

I am really not concerned with it being quiet or anything, I want it to have a good lope to it and it sounds like the 847 cam does have some lope. Seems like it would be a good choice for a bolt on car. What is the power range for that thing. I would imagine it is like 3200 to 6400 or something like that, I have no idea I am just guessing. But does anyone have any numbers as far as that goes?

FastWhiteTA

Yeah I'd like to see a GM847 dyno run. What are shift points for the 847? How does the peak power Rpm compare to the CC306?

atljar

http://home.cinci.rr.com/atljar/atlj...Heads%20NA.jpg

Thats my stock head dyno graph through a 12 bolt, SAE corrected.

I was shifting it at 6600-6700.


As for running 1.5 rockers, thats fine and dandy, BUT NOT THE STOCK ONES! Those flimsy stamped POS will snap in a heartbeat with big spring pressure and high rpms.

dmoss69

How is this cam so much better than the XE 230/236?

I understand that there is more overlap and lope, but how about that bottom end torque factor for the street? Shouldn't the XE drop the peak hp rpm by a couple hundred rpms?

What kind of stall would you have to run with this cam? 3000? I know with the XE grinds, we don't need as much of a stall than with the magnum serries grinds, plus it has more power throughout the powerband, not the peak.

Seems like the XE would be a better street cam, but if it isn't, please let me know, I'm about to install one in a friends car, and if the gas and lugging factor isn't that much different for a daily driver, I'll go with the 847. (plus we will be racing on the street some)

Thanks

D Moss

LT4POWR

XEs are better street cams.

WS Sick

Yep they are good for the street, with extra cubes though a wild cam becomes milder.

MY91Y84

how would a 847 idle/run in a carbed 383?
stick car with 3.42's


im also intrested in the differences between the XE, 306 and 847
there all faily close in "specs"

LPE Z convt

Here, http://www.madz28.com/chris847.mpg is a idle sound clip of the 847 in my car with open plate borla....The car on a mustang dyno was still making power at 6800rpm the power never fell off... I made 363rwhp with Ion (madz28.com) doing the tuning.....

Brettinator

Hey thanks Niel, that car would be mine guys and gotta say I love this cam, it's very streetable if you know how to drive your car and have tuning which I do now, the GM847 is considerably more aggressive than a cc306 or 230/236 which I considered prior purchase. The hotcam was a babycam although popular 4-5 yrs ago, it still has good results on many cars out there. I'm running Comp Hi-Tech Stainless 1.7RRs @ .610/.632 lift 112lsa with excellent valvetrain geometry & Comp Rs, Comp C-moly 1-piece p-rods, Crane 99893 springs upgraded which were better rated for the 1.7RRs, tita-keepers, yada yada yada. The key to this cam is a good tune but prior my tune it was just a little piggish from an idle, light, etc until about 1800 rpm. AFRs are next on the list. As in anything you mod on your car look long-term what your goals are, saves you $$ and nets best results. Of course I rebuilt my bottom-end with all kinda goodies after 82k miles as well and have a ton of other bolt-ons which tie cam & everything else together.

Be glad to post some sound clips if anyone could suggest a website or host for me, about 4-5 megs, have 2 clips, dual cutouts or through the Borla.

Brettinator

right now I'm shifting around 6200-6500 conservatively, still finding my sweet spot on the high-end.

badblackta

the 847 cam is not sold in a kit like the hotcam is it? Another thing, if I put just the cam in and did not rev it past 5500 with the stock rockers and all that, would it be ok for just driving around town and stuff till I get the money to beef up the valvetrain, or would I like bend the pushrods and break the rocker arms and stuff. Kind of on a limited budget But I just wanted to see if I can get it in there and do the rest when I got more money.

Grease

http://www.geocities.com/greasemunkeey/Dyno2.html

My engine's power peaked at 6400rpm but at 6800rpm it had only lost about 7hp.