comp cam?push rods?ls2
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
comp cam?push rods?ls2
i have a ? about push rod length on a ls2 with stock heads not milled stock rockers i installed a comp cam 54-444 with comp push rods 7.40 it seems like it has too much valve lash to me it clicks and clacks at idle to 1500rpm i know there is a way to check the proper rod length but i was thinking of just installing some 7.425 push rods what do you think and what size have you seen run on this combo i think comp cams are smaller on the base circle? thanks for reading this and any advise you have Scott
Melting Slicks
Joined: Jan 2005
Posts: 2,326
Likes: 5
From: louisville "derby city" kentucky
hey a/c man, 7.425 is usually what everyone runs with a comp cam. yes, they have a smaller base circle. comp has a pushrod length checker tool they sell for about 17.00 i think. 7.430 will quiet it down, but may be a little too tight for performance and smooth running. hope this helps, cranky 
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
hey a/c man, 7.425 is usually what everyone runs with a comp cam. yes, they have a smaller base circle. comp has a pushrod length checker tool they sell for about 17.00 i think. 7.430 will quiet it down, but may be a little too tight for performance and smooth running. hope this helps, cranky
Drifting
Joined: Oct 2004
Posts: 1,790
Likes: 29
From: STL MO
St. Jude Donor '09-'10
Scott, let us know how it turns out.
I am ordering a cam kit next week and some tell me to order the 7.400 and others tell me 7.425? My installer will check the the length/preload but I don't want to have to wait to send a set back to be replaced by the correct length if I can help it.
I am ordering a cam kit next week and some tell me to order the 7.400 and others tell me 7.425? My installer will check the the length/preload but I don't want to have to wait to send a set back to be replaced by the correct length if I can help it.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
Scott, let us know how it turns out.
I am ordering a cam kit next week and some tell me to order the 7.400 and others tell me 7.425? My installer will check the the length/preload but I don't want to have to wait to send a set back to be replaced by the correct length if I can help it.
I am ordering a cam kit next week and some tell me to order the 7.400 and others tell me 7.425? My installer will check the the length/preload but I don't want to have to wait to send a set back to be replaced by the correct length if I can help it.
Former Vendor
Joined: Oct 2007
Posts: 2,032
Likes: 6
From: longview tx
7.4 every time, some cams swaps make a little ticking, its just life. we have installed 100's of cams and only about 3-4 times had to use a pushrod different than a 7.4 If your questioning it Check the preload on you lifter that will tell you if you have the right length or not. Now...if you have trick flow heads you need a 7.5 most of the time, but with your ls2 heads you will be fine with the 7.4's with your comp cam, 7.4 is a tad bit longer than STOCK and that makes up for the smaller base circle of the comp cam.
Last edited by East Tx Muscle Cars; Mar 11, 2010 at 10:26 AM.
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
7.4 every time, some cams swaps make a little ticking, its just life. we have installed 100's of cams and only about 3-4 times had to use a pushrod different than a 7.4 If your questioning it Check the preload on you lifter that will tell you if you have the right length or not.
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Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
see you sat for some fine tunning on your dynojet
I'm coming to see you this sat. to dyno my car again after installing a new fuel system! hope you can get a little more Muscle out of it then i will meet you guys @ the track Sunday test-n-tune! see if i can beat my old time of 10.32 @ 131mph! bring the video cam thanks Steven for all the help on my car!
