what is the difference between these two sets?
PUSHROD SPECIFICATIONS:

7638-16
For Use with Guideplates: Yes
Tubing Diameter (in): 5/16 in.
Pushrod Material: Chromemoly
Top Tip Style: Ball
Bottom Tip Style: Ball
Intake Overall Length (in): 7.400 in.
Exhaust Overall Length (in): 7.400 in.
Quantity: Sold as a set of 16.
One Piece Pushrod: Yes
Oiling: Yes
Tapered: No
Tip Attachment: Formed
Top Tip Diameter: 5/16 in.
Bottom Tip Diameter: 5/16 in.
Wall Thickness (in): 0.080 in.
Heat Treated: Yes

7955-16
For Use with Guideplates: Yes
Tubing Diameter (in): 5/16 in.
Pushrod Material: Chromemoly
Top Tip Style: Ball
Bottom Tip Style: Ball
Intake Overall Length (in): 7.400 in.
Exhaust Overall Length (in): 7.400 in.
Quantity: Sold as a set of 16.
One Piece Pushrod: Yes
Oiling: Yes
Tapered: No
Tip Attachment: Formed
Top Tip Diameter: 5/16 in.
Bottom Tip Diameter: 5/16 in.
Wall Thickness (in): 0.080 in.
Heat Treated: Yes

 

looks like the exact same description to me...

call Comp i guess.

 

well, further research shows that the 7638-16 is a "Magnum" pushrod and the 7955-16 is a "Hi-Tech" pushrod
It appears that the Hi-Tech series has tapered ends and the Magnum series do not...
the 7955-16 are listed as genIII, which I knew...but the Magnum has no LSx listings...

 

Did you go with the hi-tech's?

 

Thunder Racing equivalent...

 

The only difference between the two p/n's that you listed is that the Hi-Techs use a "cleaner" material and are a lil' stronger and stiffer than the Magnums.

Other than the markings....they "look" identical.

 

I think we need to run hi-tech. I have some magnum lifters and hi-tech pushrod.