What pushrod length do I need
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,699
Likes: 2
From: The Black Hole LA
What pushrod length do I need
'90 auto
383 ci
Dart pro-1 heads
lingenfelter 74219 cam
1.6 roller rockers
Springs are good to .600 lift
I bought the roller rockers used and they came with hardenned pushrods, I just need to see if these are the right length. I am assuming I just need the stock length, but I don't know what that is, also is there any difference in pushrods for roller blocks/cams compared to the older style. I'm using the stock roller lifters. Thanks.
383 ci
Dart pro-1 heads
lingenfelter 74219 cam
1.6 roller rockers
Springs are good to .600 lift
I bought the roller rockers used and they came with hardenned pushrods, I just need to see if these are the right length. I am assuming I just need the stock length, but I don't know what that is, also is there any difference in pushrods for roller blocks/cams compared to the older style. I'm using the stock roller lifters. Thanks.
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,699
Likes: 2
From: The Black Hole LA
Originally Posted by Morley
Get a pushrod length checking tool ($25). and yes there is a BIG difference between hyd roller lifter push rods and flat tappet.
Thats what I figured, but care to elaborate, so I can see if these are right for my setup, or I need to get others. Go easy on me, this is my first build, so I'm learning
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by Pete K
Trust no one's opinion on pushrod length. The only correct way to know is to physically check it. If you need tips on doing this just ask. It is not hard to do.
"Guess-timates" are a bad thing...
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
As a rough guide to tell what they are from;
roller pushrods are approx 7.200
flat tappet in the 7.800 range.
But as mentioned should check as different head / rocker combos have different lenghts.
My TFS have 5 different lenghts listed as starting point foe various combos.
roller pushrods are approx 7.200
flat tappet in the 7.800 range.
But as mentioned should check as different head / rocker combos have different lenghts.
My TFS have 5 different lenghts listed as starting point foe various combos.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Indeed get the test pushrod and a test spring to find the push rod length that will cause the tip of the rocker to roll to the same length on either side of valve tip center line as you roate the crank to cause the rocker arm to move through it's full range.
