Pushrod length ?????
Pushrod length ????? OK, I've been going over and over everything I've done to my motor looking for little bits of HP here and there. I've now discovered that my pushrods might be too long. What issues will come from having pushrods that are too long? How does it affect the power? Any advice would be great. Thanks
How much too long? Might have EXTREMELY low compression numbers. 
I would suggest a pushrod checker. Figure out length at zero lash and add .08-.10 for preload and growth.
I would suggest a pushrod checker. Figure out length at zero lash and add .08-.10 for preload and growth.
Get a push rod length checker and find out what you need...
Last time I did it on dry lifters it was a very sensitive operation.. I set it to 7.000" and expand the tool in single turns until it stops spinning.. but it's DELICATE! You can't spin it like threading a bolt by hand, it's like you have to use the tips of your fingers.. . My buddy and I both did it twice and we came up with the same measurement..
Then add .050 - .075 on to your measurement for preload... (IIRC) After my H/C swap, I ended up with a final number of 7.350... So the 7.400" hardened pieces would work fine. ( .050" of preload won't kill a lifter... IMO)
Last time I did it on dry lifters it was a very sensitive operation.. I set it to 7.000" and expand the tool in single turns until it stops spinning.. but it's DELICATE! You can't spin it like threading a bolt by hand, it's like you have to use the tips of your fingers.. . My buddy and I both did it twice and we came up with the same measurement..
Then add .050 - .075 on to your measurement for preload... (IIRC) After my H/C swap, I ended up with a final number of 7.350... So the 7.400" hardened pieces would work fine. ( .050" of preload won't kill a lifter... IMO)
Get a push rod length checker and find out what you need...
Last time I did it on dry lifters it was a very sensitive operation.. I set it to 7.000" and expand the tool in single turns until it stops spinning.. but it's DELICATE! You can't spin it like threading a bolt by hand, it's like you have to use the tips of your fingers.. . My buddy and I both did it twice and we came up with the same measurement..
Then add .050 - .075 on to your measurement for preload... (IIRC) After my H/C swap, I ended up with a final number of 7.350... So the 7.400" hardened pieces would work fine. ( .050" of preload won't kill a lifter... IMO)
Last time I did it on dry lifters it was a very sensitive operation.. I set it to 7.000" and expand the tool in single turns until it stops spinning.. but it's DELICATE! You can't spin it like threading a bolt by hand, it's like you have to use the tips of your fingers.. . My buddy and I both did it twice and we came up with the same measurement..
Then add .050 - .075 on to your measurement for preload... (IIRC) After my H/C swap, I ended up with a final number of 7.350... So the 7.400" hardened pieces would work fine. ( .050" of preload won't kill a lifter... IMO)
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Staging Lane
Joined: Nov 2008
Posts: 96
Likes: 0
From: Belen, NM
OK, I've been going over and over everything I've done to my motor looking for little bits of HP here and there. I've now discovered that my pushrods might be too long. What issues will come from having pushrods that are too long? How does it affect the power? Any advice would be great. Thanks
