Pushrod question
Thread Starter
Racer
Joined: Jan 2005
Posts: 270
Likes: 0
From: O'Fallon MO
Pushrod question
2002 Z06 with a G5x3 cam and Comp 921 valve spring kit, stock heads and stock rockers. I bought the 7.400" hardened pushrods from Texas Speed. Are these the correct size for my engine? Or do I need longer or shorter? Any feedback is greatly apprericated.
Last edited by mini; Mar 23, 2006 at 02:17 AM.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
7.4" MAY be the correct size, but...
The G5X3 is a much bigger cam than the stock cam with a corresponding smaller base circle. With stock heads and head gasket the distance betweem the lobe heel and rocker cup will be greater. I would call LGM and ask them what they recommend. They've done alot of these conversions and they could recommend the correct pushrod length with one eye closed.
The G5X3 is a much bigger cam than the stock cam with a corresponding smaller base circle. With stock heads and head gasket the distance betweem the lobe heel and rocker cup will be greater. I would call LGM and ask them what they recommend. They've done alot of these conversions and they could recommend the correct pushrod length with one eye closed.
Burning Brakes
Joined: Aug 2004
Posts: 837
Likes: 2
From: Derry NH
You will be able to tell for sure when you install the rockers. Tighten a rocker to zero lash and then count the turns to 22 lb ft. You want to have 1/2 - 3/4 turns. If not than you need a different length. A pushrod length checker is only $20 from most vendors and using one is the only way you will know for sure what length you need. Make sure the lifter is on the base circle of the cam when you do the check.
Burning Brakes
Joined: Aug 2004
Posts: 837
Likes: 2
From: Derry NH
They probably are fine, but you should still check the number of turns from zero lash to 22 lb ft just to be absolutely sure. It is good practice to triple check everything when it comes to your valvetrain, then triple check it again. IMO
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Melting Slicks
Joined: Jan 2004
Posts: 2,746
Likes: 2
From: St. james NY
How come some people run the 7.425 size?
Theres a thread over at ls1tech with people saying that the 7.400 cause valvetrain noise with bigger cams but when you upgrade it to 7.425's it makes it much quieter.
So whats the deal?
Theres a thread over at ls1tech with people saying that the 7.400 cause valvetrain noise with bigger cams but when you upgrade it to 7.425's it makes it much quieter.
So whats the deal?