To The People Running The "GM847" Cam....
To The People Running The "GM847" Cam.... I USED SEARCH FIRST! No Luck So Here We Go......
What are you shifting at? Whats The Idea RPM Range of this cam? If I dont install a better rotating assembly right away and shift at around 6200 will I still make any power for the time being? Also whats a good set of Springs and rocker arms for the GM847, I know this cam gets brought up ofton but I tried searching for rpm range but had no luck, thanks.
Chris
What are you shifting at? Whats The Idea RPM Range of this cam? If I dont install a better rotating assembly right away and shift at around 6200 will I still make any power for the time being? Also whats a good set of Springs and rocker arms for the GM847, I know this cam gets brought up ofton but I tried searching for rpm range but had no luck, thanks.
Chris
Staging Lane
Joined: May 2004
Posts: 72
Likes: 0
From: Ft Wayne, IN
I just ordered a very similar cam. I'm setting my shift points at 6500. I ended up getting the 918 springs, comp 1.6 nsa rr. Cms said the heads have to be machined for the springs, but that just gives me an excuse to get them p and p while there off. Hope this info helped I'll have more after the install.
TECH Apprentice
Joined: Aug 2004
Posts: 362
Likes: 0
I have a GTP-6 which is the same cam with a 1* change on the intake side. I'm running 987's with hardened pushrods and comp R lifters. RR's are crane golds. No problems and it will make power past the point you are wanting to spin it.
You'll be fine shifting at 62-6400...but she'll want more.
You'll be fine shifting at 62-6400...but she'll want more.
When I had 5.14 gears, Id shift at 6800, and cross the traps at 7000...
of course that was also with a cheapo torque converter that had HORRIBLE slippage, but the stock rotating assy. will take it in stride... as long as you have good oil pressure and the bearings aint worn out... When I had 115,000 on the car and a shift kit, I still let it shift automaticall with the stock tranny,
accidentally left it in 2nd from the burnout, before I knew it 1st, 2nd, .......7000 RPM oops... Spun 5 bearings.... rebuild time..ballanced and BP bottom end.
but now I can spin it to 7k whenever I want if I get a bigger cam.
of course that was also with a cheapo torque converter that had HORRIBLE slippage, but the stock rotating assy. will take it in stride... as long as you have good oil pressure and the bearings aint worn out... When I had 115,000 on the car and a shift kit, I still let it shift automaticall with the stock tranny,
accidentally left it in 2nd from the burnout, before I knew it 1st, 2nd, .......7000 RPM oops... Spun 5 bearings.... rebuild time..ballanced and BP bottom end.
but now I can spin it to 7k whenever I want if I get a bigger cam.
