Correct pushrods??
Thread Starter
Pro
Joined: Dec 1999
Posts: 673
Likes: 0
From: Venetia,Pa,USA
Correct pushrods??
I'm getting close to installing my new cam. The engine[ ZZ4 crate engine] has less than 1000 miles on it. It had from the factory with roller lifters and I'm adding along with the cam Crane 1.6 roller rockers. Are the push rods OK to use. Iwas told I'll need harden rods. Are the ZZ4 rods considered harden??
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
If you are using stock type "self aligning " rockers you don't need guide plates therefore you don't need hardened pushrods.
On the otherhand if using "non self aligning " rockers you need guideplates therefore hardened pushrods on account the pushrods rub against the guideplate.
On the otherhand if using "non self aligning " rockers you need guideplates therefore hardened pushrods on account the pushrods rub against the guideplate.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Bus,
You also need to make sure they are the correct length. The Crane rockers may be slightly different. Need to make sure the rocker crosses the mid 2/3's of the valve stem. You can use some tracing paper to see the pattern. But at TDC, the rocker should be above the midpoint of the stem, and at full lift below the midpoint. Getting a pushrod length checker is an inexpensive way of making sure.
You also need to make sure they are the correct length. The Crane rockers may be slightly different. Need to make sure the rocker crosses the mid 2/3's of the valve stem. You can use some tracing paper to see the pattern. But at TDC, the rocker should be above the midpoint of the stem, and at full lift below the midpoint. Getting a pushrod length checker is an inexpensive way of making sure.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Originally Posted by The Bus
Thanks. I already have the studs and guide plates installed. Therefore I need different push rods. I'm getting a real education installing this cam. Thanks
The question remains are they proper guideplates or just the plates installed to aid assembly at the factory.
The ZZ4 uses the "113" Vette head with better (LT4 ) springs.
I personally think thestock ZZ4 plates are not proper guide plates as ZZ4 have self aligning rocker therefore do not use guideplates in the true sense
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Bus,
DO NOT use guideplates with self aligning rockers. If the Cranes' came with the guideplates then use them.Using guideplates with self aligning rockers may cause binding which is a bad thing.
DO NOT use guideplates with self aligning rockers. If the Cranes' came with the guideplates then use them.Using guideplates with self aligning rockers may cause binding which is a bad thing.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Melting Slicks
Joined: Feb 2002
Posts: 2,699
Likes: 2
From: The Black Hole LA
Originally Posted by Dominic Sorresso
Bus,
You also need to make sure they are the correct length. The Crane rockers may be slightly different. Need to make sure the rocker crosses the mid 2/3's of the valve stem. You can use some tracing paper to see the pattern. But at TDC, the rocker should be above the midpoint of the stem, and at full lift below the midpoint. Getting a pushrod length checker is an inexpensive way of making sure.
You also need to make sure they are the correct length. The Crane rockers may be slightly different. Need to make sure the rocker crosses the mid 2/3's of the valve stem. You can use some tracing paper to see the pattern. But at TDC, the rocker should be above the midpoint of the stem, and at full lift below the midpoint. Getting a pushrod length checker is an inexpensive way of making sure.
Can anyone elaborate a little more on this process, or have any pics or where the rocker roller needs to be on the valve stem. I need to check this as well on my build.
