How to check push rod length?
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
How to check push rod length?
OK.
Carcraft web site says to
1. put a valve on the base circle,
2. then remove the rocker and put some black sharpie on the top of the valve,
3. then put the rocker back on an roll the rocker tip.
Is it this easy?
I did this and it looks like my 7.250 are too short and I get a better witness mark with 7.450 length, using a trick flow adjustable push rod tool.
I have Hyd-Roller lifters, Comp Cams 1.6 RR's, AFR 210's/68 CC, and a .005 in the hole deck
TIA
Carcraft web site says to
1. put a valve on the base circle,
2. then remove the rocker and put some black sharpie on the top of the valve,
3. then put the rocker back on an roll the rocker tip.
Is it this easy?
I did this and it looks like my 7.250 are too short and I get a better witness mark with 7.450 length, using a trick flow adjustable push rod tool.
I have Hyd-Roller lifters, Comp Cams 1.6 RR's, AFR 210's/68 CC, and a .005 in the hole deck
TIA
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
OK, i did the check in this link several times this morning because the bottom of the rocker looked really close to the top of the lifter.
I used this method
http://www.carcraft.com/techarticles/116_0401_push/
Based on this method, the push rods shuold be 7.500 inch in length
Previosuly I had 7.250 length pushrods but the witness mark for the short PR's barely reaches teh center of the valve.
With teh 7.500 length the roller tip witness mark looks to be making a mark of equal travel distance on both sides of center.
Thoughts?
I used this method
http://www.carcraft.com/techarticles/116_0401_push/
Based on this method, the push rods shuold be 7.500 inch in length
Previosuly I had 7.250 length pushrods but the witness mark for the short PR's barely reaches teh center of the valve.
With teh 7.500 length the roller tip witness mark looks to be making a mark of equal travel distance on both sides of center.
Thoughts?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by LD85
With teh 7.500 length the roller tip witness mark looks to be making a mark of equal travel distance on both sides of center.
Thoughts?
Thoughts?
RACE ON!!!
