pre-load on hyd. lifters
Thread Starter
Staging Lane
Joined: Mar 2003
Posts: 54
Likes: 0
From: Cleveland, Ohio
pre-load on hyd. lifters Heres my concern.....i was putting the engine back together,,,and when it came time to check pushrod lenght this is what happened
cam 222/224/566/568 112
heads are milled .025
The lifters are suppose to have .020-.040 of pre-load mine had about .100-.120.
so to me i will have to go with shorter pushrods--7.30-7.35's
I've notice there is not alot of talk about pre-load on the lifters...r you guys just putting the stock 7.40's back in with out checking pre-load???
Or am i to concerned with this matter. I'm going to talk to comp cams tomorrow about this but in there directions they make it VERY CLEAR. So what r you guys doing????
cam 222/224/566/568 112
heads are milled .025
The lifters are suppose to have .020-.040 of pre-load mine had about .100-.120.
so to me i will have to go with shorter pushrods--7.30-7.35's
I've notice there is not alot of talk about pre-load on the lifters...r you guys just putting the stock 7.40's back in with out checking pre-load???
Or am i to concerned with this matter. I'm going to talk to comp cams tomorrow about this but in there directions they make it VERY CLEAR. So what r you guys doing????
TECH Junkie
Joined: Nov 2001
Posts: 3,604
Likes: 0
From: Los Angeles
Re: pre-load on hyd. lifters Are you using stock lifters or comp-r's? The stock ones are fine with all sorts of preload it seems. The comp-r's want 20 thousanths or so (half a turn on the bolt). Shorter pushrods are one way to get what you are looking for.
I'm running 10 thousanths preload on my setup, 0.030" milled heads, 7.35" pushrods.
I'm running 10 thousanths preload on my setup, 0.030" milled heads, 7.35" pushrods.
Thread Starter
Staging Lane
Joined: Mar 2003
Posts: 54
Likes: 0
From: Cleveland, Ohio
Re: pre-load on hyd. lifters jmx----
I running stock lifters....You say your putting preload in the lifter by turning the bolt after 22lbft.??? You really should have the pre-load at 22lbft. if i'm understanding it correctly.
I did by the 7.35's tonight but at the same time i'm hit the MAX preload with this and if i go with the 7.30's i would have to shimm....
Slowhawk....you were getting the same numbers...thats great to hear <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" alt="[chug]" title="" src="graemlins/gr_chug.gif" /> I thought maybe i was the only one..I think they come from the factory with the wrong pre-load or something. If i do the math----hear me out-- my new cam's base circle is .074 smaller than my stock one...so cut that in half is about .037 and then subtract my milled head amount .025 i should have come up with .012 to play with..meaning i should have to buy a larger pushrod not a shorter one...but all in all the reading i'm getting now says i need to go shorter...
I running stock lifters....You say your putting preload in the lifter by turning the bolt after 22lbft.??? You really should have the pre-load at 22lbft. if i'm understanding it correctly.
I did by the 7.35's tonight but at the same time i'm hit the MAX preload with this and if i go with the 7.30's i would have to shimm....
Slowhawk....you were getting the same numbers...thats great to hear <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" alt="[chug]" title="" src="graemlins/gr_chug.gif" /> I thought maybe i was the only one..I think they come from the factory with the wrong pre-load or something. If i do the math----hear me out-- my new cam's base circle is .074 smaller than my stock one...so cut that in half is about .037 and then subtract my milled head amount .025 i should have come up with .012 to play with..meaning i should have to buy a larger pushrod not a shorter one...but all in all the reading i'm getting now says i need to go shorter...