Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - vortec head modification for .480 lift
View Single Post
  #33 (permalink)  
Old 09-30-2011, 12:58 PM
ap72 ap72 is offline
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 31
Posts: 9,544
Wiki Edits: 0

Thanks: 20
Thanked 404 Times in 377 Posts
Originally Posted by cobalt327
This would be a 360 lb/in rate.

This is very close to the Comp Cams spring p/n 26981. Seat 110# @1.7", open 292# @ 1.175 (0.525").

My question is why would GM this spring on the 3100? Maybe it's because of the redline of this engine. Or a tall installed height... Anyone know what the installed height is on the 3100? Or the redline? I know the redline of the '09 Impala 3.5L is 6400 and will rev higher.
I'm pretty sure its 1.800".
Reply With Quote