***7.450 push rods***
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Deno, EMPTY YOUR PMs!!! By what you are describing you need shorter pushrods. Probably 7.350. I used that exact length before. You dont need to count the turns til they're torqued, just from the point of no free play, to the point of the rocker being seated completely.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
thanks...
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Thank you for understanding..
Sleeper
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Deno, EMPTY YOUR PMs!!! By what you are describing you need shorter pushrods. Probably 7.350. I used that exact length before. You dont need to count the turns til they're torqued, just from the point of no free play, to the point of the rocker being seated completely.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
Thanks
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
PM sent. But most of it has been covered here. If you need anything just holla.....
Need somebody to straighten it out? I've always wanted to see Cali!! Farthest I've been that direction is Vegas.
Need somebody to straighten it out? I've always wanted to see Cali!! Farthest I've been that direction is Vegas.
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
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From: American Canyon Lethal Injection
Want to thank , TLewis, edcmat and others for all the help and patients they gave me.
Going to order a "push rod checker" just as suggested and hope to have nice sewing machine sound soon...
Thanks guys
Going to order a "push rod checker" just as suggested and hope to have nice sewing machine sound soon...
Thanks guys
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Over 1 turn means the p-rod is too long. How much in quarter turns does it go past?
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Melting Slicks
Joined: Jul 2006
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From: Chesapeake Va
Melting Slicks
Joined: Jun 2005
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From: NY- 2013 Corvette Challenge Champion-2013 Index Combo Champion 2015 CC/MM Champion
St. Jude Donor '07
Correct me if I'm wrong here.If he's getting more then one turn on the bolt,He's getting more preload right? If he goes to a shorter pushrod that means less preload right? IMO its going to be louder/more sewing machine noise then before,Right or wrong?I thought you said your injectors were making noise.And also I would check and make sure you don't have a broken spring or something.................Paul
Last edited by DRIVER456; Aug 21, 2007 at 08:07 AM.
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Correct me if I'm wrong here.If he's getting more then one turn on the bolt,He's getting more preload right? If he goes to a shorter pushrod that means less preload right? IMO its going to be louder/more sewing machine noise then before,Right or wrong?I thought you said your injectors were making noise.And also I would check and make sure you don't have a broken spring or something.................Paul
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
Correct me if I'm wrong here.If he's getting more then one turn on the bolt,He's getting more preload right? If he goes to a shorter pushrod that means less preload right? IMO its going to be louder/more sewing machine noise then before,Right or wrong?I thought you said your injectors were making noise.And also I would check and make sure you don't have a broken spring or something.................Paul
On adjustable ones, I've ran as little as 1/4 turn with no noise.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Correct. Anything between 1/2 turn to 1.5 turns to me is acceptable. It will keep you in that comfort zone. Ideally, you want one turn exactly. Anything less than 1/2 turn and you dont have enough preload, and chances are it will make some noise.
On adjustable ones, I've ran as little as 1/4 turn with no noise.
On adjustable ones, I've ran as little as 1/4 turn with no noise.
After playing with shims on non-adjustables and everything on adjustables, a 1/2 to 3/4 turn for me is the quietest. For those that go w/ GM specs and are quiet, great... if not, go less and you can smile while listening to the motor again 
Arnel
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
Sorry to disagree, but I thought the 7.425's sounded louder - maybe that's just cause the 7.425 clip of the engine compartment was longrer - however, only real way to correctly determine the needed legnth is w/ a pushrod checker - which I believe you have ordered - also, I've just grown to accept that some sewing machine noise is inevitable and the sound of horsepower - also, also, I think headers amplify the sewing machine sound
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
I just swapped my OEM gm rockers with 130,000 mi on them for a brand new set of OEM GM's. At the same time I noticed that some of the pushrods had worn more than others due to the worn rockers (at the pushrod pivot cup). I flipped the pushrods that were worn so they would wear/seat properly with the new rockers, since the lifter end is far less critical. Lastly, I changed out my oil, threw in a Supertech 3675 (6.0L truck filter) and some 15w50 Mobil 1.
The valvetrain is SIGNIFICANTLY quieter now, hardly any sewing machine noise outside the car...and even less inside. Before I could hear a definite ticking from inside the car but now that's gone.
Could it be the better oil pressure from the thicker oil? Flipped pushrods mating with the new rockers? Or could it be that the rockers themselves were worn and causing additional noise? I don't know the answer...but I do know that I didn't change out my 7.400" Texas Speed hardened pushrods and everything is quiet as heck now.
The valvetrain is SIGNIFICANTLY quieter now, hardly any sewing machine noise outside the car...and even less inside. Before I could hear a definite ticking from inside the car but now that's gone.
Could it be the better oil pressure from the thicker oil? Flipped pushrods mating with the new rockers? Or could it be that the rockers themselves were worn and causing additional noise? I don't know the answer...but I do know that I didn't change out my 7.400" Texas Speed hardened pushrods and everything is quiet as heck now.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Deno, EMPTY YOUR PMs!!! By what you are describing you need shorter pushrods. Probably 7.350. I used that exact length before. You dont need to count the turns til they're torqued, just from the point of no free play, to the point of the rocker being seated completely.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
I explained a little better in the PM, but CANT SEND IT TO YOU. I'll send it later tonite.
This is what I believe will take care of it...What seemed like a long time ago... I did the same as you. I went with longer rods since it did sound quieter than 7.40's or stockers (quieter but not by much and definitely now where nears stock). A buddy of mine (Suks2bu) figured out that after a cam change leading to louder valvetrain that, after playing with a number of shim thicknesses, a 1/2 turn got him the quietest. I had the HS rockers back then and shimmed them up to 1/2 turn preload and was just freakin amazed. It was quiet and beautiful!!
Since then I've installed Crane adjustable rockers so I don't have to run shims and am now able to set whatever preload I want. The quietest is still between 1/2 to 3/4 turn. The sad part (kinda) is that it's no quieter than stock rockers with shims.
Arnel
Last edited by AVB; Aug 22, 2007 at 11:41 AM.