Waldo308355

Hi just wondering if anyone has run the Summit pro LS 8720r1 cam ?and if so was the stock pushrod length retained ?

BigBlackCamaro

I used a 8707 Summit cam in a 5.3 with the stock length pushrods, then swapped it to a 8719 and went with 7.350 pushrods. Both to keep it around .080 lifter preload.

Then I built an aluminum 6.0 with a summit 8706 and used 7.425 pushrods. Again to keep around .080 lifter preload.

As you might guess you should measure for the correct length.

Summitracing

OP,

Our SUM-8720R1 is one of our most popular Pro LS cams. It fits the bill for a variety of applications. We typically see a 7.400" or 7.425" pushrod work with the 8720R1. As @BigBlackCamaro said it's best to measure for pushrod length before purchasing pushrods to ensure you're getting proper lifter preload. A pushrod length checker is a must-have for anyone doing cam swaps. For pushrods, we recommend a minimum of a 5/16" Chromoly pushrod with a .080" wall. You can typically find a set of 16 for around $100.


To help with checking pushrod length see the videos below.

Here's a video we put together for checking pushrod length on an LS engine with a pushrod length checker and a set of dial calipers.

Here's a video from Richard Holdener showing the "turn method" for checking pushrod length.

Let us know if we can be of any further assistance.