Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Pushrod length
Thread: Pushrod length
View Single Post
  #2 (permalink)  
Old 03-18-2013, 12:39 AM
cobalt327's Avatar
cobalt327 cobalt327 is offline
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
If the lifters are the same as the OEM hydraulic rollers, you'll be in the 7.2" range. IIRC most others are in the 7.3" range. But Crane uses very short p-rods for some of their hydraulic roller lifters and cams (just over 7.00").

If you know the brand of the lifters you can research it from that, or by measuring the distance between the p-rod body and rocker arm, then adding the depths of the cups. This will get you a ballpark figure to work with to make a tool.

Other things that can effect p-rod length is the valve length and cam base circle diameter, so you will need to mock it up once you get a ballpark figure to work from. A couple pages that will help:

Adjusting hydraulic lifters
Valve train points to check
Valve train geometry
Valve spring installed height

Click on image for details on making an adjustable pushrod:

Other homemade pushrod length checking tools at
Reply With Quote