gm847
Brentinator put down 377 RWHP with that cam, bolt ons using stock heads.
https://ls1tech.com/forums/showthrea...=303172&page=2
https://ls1tech.com/forums/showthrea...=303172&page=2
Originally Posted by TurboZ28
Ya, I heard with stock heads and a tune your guaranteed around 350. Another question though, can I run a GM847 on the stock valvetrain?
Sure can, and you wont have to change valve springs at all. It will idle at 650rpm too!.
j/k.........Yes, you will have to change valve springs if there stock. Also will probably have to rais idle to 900-1000 rpm.
TECH Regular
Joined: Feb 2005
Posts: 481
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From: Arlington TX
Talked to one of those cam help guys from Comp Cams and I must say those guys are awesome. instantly knew what to tell me, just off the top of his head. But if anyone else besides me is wondering what valvetrain parts they need to put a GM847 in, you need Valvespring# 26915-16 and Retainer # 787-16.
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you will need roller rockers with it and maybe new pushrods. i'd suggest some ARP rocker studs also
also a micrometer too set up the correct height for the spring and a shim kit for use with the micrometer too obtain the correct installed height
the factory stamped steel rockers are junk (IMO) plus you wont obtain full potential of that cam with stock rockers. because of friction losses and lift limitations
starts too penny up doesnt it
a cam as large as the 847, you dont want too skimp on valvetrain components too try and save a buck or 2
also a micrometer too set up the correct height for the spring and a shim kit for use with the micrometer too obtain the correct installed height
the factory stamped steel rockers are junk (IMO) plus you wont obtain full potential of that cam with stock rockers. because of friction losses and lift limitations
starts too penny up doesnt it
a cam as large as the 847, you dont want too skimp on valvetrain components too try and save a buck or 2
Last edited by simple; Aug 31, 2005 at 11:24 AM.
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i have the 847 cam, i used k-motion k-800 valve springs, 10* locks, and their Titanium retainers, along w/ comp chromoly pushrods, and pro mag 1.6 rr's.. the cam screams like a banshee!
