Pushrod Length Method
Thread Starter
Staging Lane
Joined: Jun 2006
Posts: 54
Likes: 1
From: Minnesota
Pushrod Length Method Geeze I got issues...
My pushrods are the wrong length. Here is my methodology:
1. I measured my stock cam's base circles (intake and exhaust) to be 1.500"
2. Then I called comp cams and with my serial number got the base circle measurements (intake and exhaust) 1.445" and 1.433"
3. Then I looked up the stock pushrod length 7.400" (roughly some say a little less like 7.395").
4. I subtracted the base circles of the stock and aftermarket cam.
1.500-1.445=.055
5. I added .055" to 7.400" = 7.455"
This should be my required length right?
The only thing is I called Texas Speed and told them my method but they said to add half of the difference so only .025 yeilding 7.425" as my required length. Any input?
My pushrods are the wrong length. Here is my methodology:
1. I measured my stock cam's base circles (intake and exhaust) to be 1.500"
2. Then I called comp cams and with my serial number got the base circle measurements (intake and exhaust) 1.445" and 1.433"
3. Then I looked up the stock pushrod length 7.400" (roughly some say a little less like 7.395").
4. I subtracted the base circles of the stock and aftermarket cam.
1.500-1.445=.055
5. I added .055" to 7.400" = 7.455"
This should be my required length right?
The only thing is I called Texas Speed and told them my method but they said to add half of the difference so only .025 yeilding 7.425" as my required length. Any input?
Yeah, it's half because if you think about it, the requirement of the pushrod length will change accordingly with the radius of the base circle, not the diameter.
That said, get a pushrod length checker
That said, get a pushrod length checker
Thread Starter
Staging Lane
Joined: Jun 2006
Posts: 54
Likes: 1
From: Minnesota
Originally Posted by Grimes
Yeah, it's half because if you think about it, the requirement of the pushrod length will change accordingly with the radius of the base circle, not the diameter.
That said, get a pushrod length checker
That said, get a pushrod length checker
Yeah I realize I am retarded. I looked at the diameter duh
. So if I get the 7.425" I should be right on the money. 
Originally Posted by zheiling
Yeah I realize I am retarded. I looked at the diameter duh . So if I get the 7.425" I should be right on the money.
. So if I get the 7.425" I should be right on the money.
