hotcam vs gm846
TECH Resident
Joined: Jun 2002
Posts: 943
Likes: 2
From: Houston
847 is a serious cam and will out perform the hotcam significantly, will not be emissions legal without some serious tuning though. need full intake and exhaust to complement the 847 cam as it is much larger duration wise and lift wise, can be run without either though, just not as well.
Teching In
Joined: Dec 2003
Posts: 10
Likes: 0
From: Chicago, IL
Originally Posted by Gangly
847 is a serious cam and will out perform the hotcam significantly, will not be emissions legal without some serious tuning though. need full intake and exhaust to complement the 847 cam as it is much larger duration wise and lift wise, can be run without either though, just not as well.
Spec's for GM 846 and 847 Here is the spec's off web site
www.gmpartsdirect.com
Been told on both of these cam's in my 94 Z-28 350 LT-1 I or you will need tuneing, stall, and gear
Setup I am Looking at is ...GM847 with 1.65 Rockers, auto w/ 3000 stall and 3.73 Gears
12370846 Hydraulic Roller Design
This hydraulic roller design contains eccentric for mechanical fuel pump. It is for off-road use only. The duration at .050" tappet lift (intake/exhaust) is 222/230; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 509/528. Valve lash is zero/zero and lobe centerline is 112 degrees.
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12370847 Hydraulic Roller Design
This hydraulic roller design contains eccentric for mechanical fuel pump. It is for off-road use only. The duration at .050" tappet lift (intake/exhaust) is 234/242; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 539/558. Valve lash is zero/zero and lobe centerline is 112 degrees.
Michael "Thumper"
www.gmpartsdirect.com
Been told on both of these cam's in my 94 Z-28 350 LT-1 I or you will need tuneing, stall, and gear
Setup I am Looking at is ...GM847 with 1.65 Rockers, auto w/ 3000 stall and 3.73 Gears
12370846 Hydraulic Roller Design
This hydraulic roller design contains eccentric for mechanical fuel pump. It is for off-road use only. The duration at .050" tappet lift (intake/exhaust) is 222/230; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 509/528. Valve lash is zero/zero and lobe centerline is 112 degrees.
--------------------------------------------------------------------------------
12370847 Hydraulic Roller Design
This hydraulic roller design contains eccentric for mechanical fuel pump. It is for off-road use only. The duration at .050" tappet lift (intake/exhaust) is 234/242; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 539/558. Valve lash is zero/zero and lobe centerline is 112 degrees.
Michael "Thumper"
