the gm 847 cam
Registered User
Joined: May 2002
Posts: 622
From: Nashville, TN
Originally posted by 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.
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.
So basically, save more $ for upgraded valvetrain parts.
Jason
Registered User
Joined: Feb 2001
Posts: 1,967
From: Bay Area, CA, USA
Originally posted by mebanditws6
No, when you put the cam in, put better hardened pushrods with guideplates, significantly stiffer springs to handle the lift and the increased ramp, and rocker arms, preferably pro-mag 1.52's. Since this cam is pretty big and needs a stiff spring to keep the valves in check, you'll also need some strong lifters in there too. The stockers aren't gonna tolerate things very well in there. When you go with a big cam, things start adding up fast.
So basically, save more $ for upgraded valvetrain parts.
Jason
No, when you put the cam in, put better hardened pushrods with guideplates, significantly stiffer springs to handle the lift and the increased ramp, and rocker arms, preferably pro-mag 1.52's. Since this cam is pretty big and needs a stiff spring to keep the valves in check, you'll also need some strong lifters in there too. The stockers aren't gonna tolerate things very well in there. When you go with a big cam, things start adding up fast.
So basically, save more $ for upgraded valvetrain parts.
Jason
As for driveability, it all depends on tuning. I still have a little bit of surging at low RPM but I will get rid of it soon. Another thing I will say is that with a big cam, your low end will disappear like the great houdini. GET GEARS! Low ones at that... my car is supercharged and I decided on a Ford 8.8 with 3.90's, I think that should be a good ratio. I think Atljar is running 4.56's!!!! That is insane, I can't imagine what first gear feels like on slicks, the car probably leaps forward haha.
Registered User
Joined: Apr 2001
Posts: 2,195
From: Springfield, IL
you should be able to get it from Dal or Jason for about $220 SDPC also sells it
when i was gonna use that cam and cancelled my order about 2 months ago it was on back order (must be popular now)
yeah the GMPP rockers would be fine with it, just not the springs that come in that kit
i would think the CM612 springs would work with it also
when i was gonna use that cam and cancelled my order about 2 months ago it was on back order (must be popular now)
yeah the GMPP rockers would be fine with it, just not the springs that come in that kit
i would think the CM612 springs would work with it also
Registered User
Joined: Apr 2001
Posts: 2,195
From: Springfield, IL
Originally posted by 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.....
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.....
Registered User
Joined: Jan 2003
Posts: 719
From: Lafayette IN.
Originally posted by simple
is that a stock head car?
is that a stock head car?
Registered User
Joined: Apr 2001
Posts: 2,195
From: Springfield, IL
Originally posted by LPE Z convt
No that is with LPE heads ... The mustang dyno gives #s about 12-15% lower than the dynojet... I would love to go to a dynojet but the closest one is like 1.5 hours away that has wideband the mustang was in my town.... 363 times 12%= 43.56 plus 363=406.56rwhp.....
No that is with LPE heads ... The mustang dyno gives #s about 12-15% lower than the dynojet... I would love to go to a dynojet but the closest one is like 1.5 hours away that has wideband the mustang was in my town.... 363 times 12%= 43.56 plus 363=406.56rwhp.....
we've got one of each here a Mustang dyno and Dyno jet
screw equations strap it on a dynojet and get the real #'s
atljar, i've heard your car a few times
but am more impressed with the times you've layed down
Registered User
Joined: Nov 2003
Posts: 40
Originally posted by FacelessZ
How would the EX 612 springs (good to .600") work with the 847? Anyone using them? I'd be retaining my 1.6 rockers...so the lift would be very close to .600"...
How would the EX 612 springs (good to .600") work with the 847? Anyone using them? I'd be retaining my 1.6 rockers...so the lift would be very close to .600"...
Registered User
Joined: Jan 2003
Posts: 719
From: Lafayette IN.
Originally posted by simple
i didnt know if that was your car or not!
we've got one of each here a Mustang dyno and Dyno jet
screw equations strap it on a dynojet and get the real #'s
atljar, i've heard your car a few times but am more impressed with the times you've layed down
i didnt know if that was your car or not!
we've got one of each here a Mustang dyno and Dyno jet
screw equations strap it on a dynojet and get the real #'s
atljar, i've heard your car a few times
but am more impressed with the times you've layed down
