L83 rocker arm ratio? first I'm wondering what the stock rocker ratio is on the L83? second, what can I safely increase the ratio too, before causing damage to valve tip, or valve guide? Thanks for any info you can share!!! |
If the LT engines are the same as LS engines, the ratio is 1.7:1. I have not heard that has changed. Not sure if anyone makes different ratio rockers for those engines yet. Might be better off changing the cam. |
Gen V LT1 has "Rocker Arms: Cast Roller Trunnion, 1.81:1 Ratio" from all the info I've read. The was taken from PACE Performance.com Who knows if a 5.3L is the same ratio or not. |
Whoa! So they DID change the ratio. Good to know! |
I just found some tech data saying the DI L83 is 1.8:1 |
Originally Posted by G Atsma
(Post 20041524)
If the LT engines are the same as LS engines, the ratio is 1.7:1. I have not heard that has changed. Not sure if anyone makes different ratio rockers for those engines yet. Might be better off changing the cam. |
Originally Posted by 64post
(Post 20077089)
Wrong, 1.8 is the rocker ratio. |
could this be one reason the AFM lifters are failing? due to such high rocker arm ratio? too much stress on the AFM lifters.. |
There are thousands of L83 engines out there running without failure. You have a different problem. |
Originally Posted by flyingfool
(Post 20041519)
first I'm wondering what the stock rocker ratio is on the L83? second, what can I safely increase the ratio too, before causing damage to valve tip, or valve guide? Thanks for any info you can share!!! My advice is it would be a much better plan to cam it the way you want and ditch the AFM lifters while you're there and don't jack with the stock rockers. Besides if you do a higher ratio rocker you'll need upgraded valve springs too. Just another reason you might as well just do the cam and get rid of all the problematic parts. |
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