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will 2.02 valve heads work on stock bottom end ?

  • Thread starter Thread starter 89lxcoupe
  • Start date Start date Oct 7, 2006
8

89lxcoupe

Founding Member
Oct 6, 2001
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harlan,ky
Oct 7, 2006
#1
  • Oct 7, 2006
  • #1
will 2.02 valve heads work on stock bottem end ?
 

65ShelbyClone

Founding Member
Sep 9, 2000
4,675
38
119
Antelope Valley, SoCal
Oct 7, 2006
#2
  • Oct 7, 2006
  • #2
Maybe with a lame low-lift cam, but otherwise no. 1.90s are a stretch.
 
C

C0V3R

Member
Feb 14, 2003
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Australia
Oct 7, 2006
#3
  • Oct 7, 2006
  • #3
On TW heads yes according to TFS and my experience..
 
8

86bluecobra

Advanced Member
Dec 20, 2004
4,265
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69
B.C. Canada
Oct 7, 2006
#4
  • Oct 7, 2006
  • #4
65ShelbyClone said:
Maybe with a lame low-lift cam, but otherwise no. 1.90s are a stretch.
Click to expand...
Its not the lift that is the issue. When a cam is at max lift the piston is nearing the bottom of the cylinder or at least on its way down. it is duration that you have to worry about for you piston to valve clearence.
 

Modular2v

Founding Member
Jun 30, 2002
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oklahoma
Oct 7, 2006
#5
  • Oct 7, 2006
  • #5
86bluecobra said:
Its not the lift that is the issue. When a cam is at max lift the piston is nearing the bottom of the cylinder or at least on its way down. it is duration that you have to worry about for you piston to valve clearence.
Click to expand...
exactly!
 

65ShelbyClone

Founding Member
Sep 9, 2000
4,675
38
119
Antelope Valley, SoCal
Oct 8, 2006
#6
  • Oct 8, 2006
  • #6
86bluecobra said:
Its not the lift that is the issue. When a cam is at max lift the piston is nearing the bottom of the cylinder or at least on its way down. it is duration that you have to worry about for you piston to valve clearence.
Click to expand...

I was speaking from the position that more lift can be done without more duration, but it places more demand on a good valvetrain. With that in mind, most aftermarket cams combine the two. My Crane 2031 is a high lift/low duration cam, but I still had to clearance the pistons with 1.90s.
 
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