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Broken rocker arm

 
Old 05-20-2019, 01:28 PM
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Default Broken rocker arm

Broke a rocker arm with trunion, btr660 and hardened pushrods after a few hundred miles. Cam is 224/236 .629 .604, 6500 rpms, 7.4 push rods with 90 preload, 105 ptv, heads shaved 20
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Old 05-20-2019, 01:38 PM
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BOTH the rocker and trunnion broke?
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Old 05-20-2019, 02:28 PM
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Just the tip of one rocker
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Old 05-20-2019, 02:58 PM
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You do a leakdown test?

Is the cylinder in question still good to go?

I've not broken a rocker arm before without PtV contact... :-(...

Last edited by Hodgdon Extreme; 05-20-2019 at 03:24 PM.
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Old 05-20-2019, 03:50 PM
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I used compressed air to hold the valve up to remove the spring, but not an actual leak down test. Also removed the head and no marks on the pistons
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Old 05-20-2019, 04:50 PM
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Originally Posted by Andrewhuffman View Post
Also removed the head and no marks on the pistons
Well that's a good sign. Guess all you can do is replace the rocker and carry on.
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Old 05-20-2019, 08:14 PM
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Are you positive that the rockers are GM, and not a knockoff? They are popping up lately, ironically in two pieces, on here.
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Old 05-21-2019, 06:31 AM
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Is there a way to verify?
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Old 05-21-2019, 08:38 AM
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OEM is in the bottom, it also has letters and numbers on them. Was this an ls3/l92 style head?
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Old 05-21-2019, 09:51 AM
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Yes. I might just buy new ones

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Old 05-21-2019, 11:36 AM
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Originally Posted by Andrewhuffman View Post
Yes. I might just buy new ones
j
Mines broke in the same spot, did you purchase them from Michigan motorsports?
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Old 05-21-2019, 12:25 PM
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Originally Posted by lawrenq View Post
Mines broke in the same spot, did you purchase them from Michigan motorsports?
M&M Motorsports
5501 Hooper DR.
Wichita Falls, TX 76306
User BMFRC
Name Lamar Murphy
Email [email protected]


just googled the seller 😭😭😭😭

I talked with him on the phone and he is very knowledgeable, responds fast, quick shipper, all the parts were new and as described. I bought a bunch of stuff from him.

I might need to look for new rockers... do you think the trunion is ok to reuse?
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Old 05-21-2019, 12:51 PM
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Originally Posted by Andrewhuffman View Post
M&M Motorsports
5501 Hooper DR.
Wichita Falls, TX 76306
User BMFRC
Name Lamar Murphy
Email [email protected]


just googled the seller 😭😭😭😭

I talked with him on the phone and he is very knowledgeable, responds fast, quick shipper, all the parts were new and as described. I bought a bunch of stuff from him.

I might need to look for new rockers... do you think the trunion is ok to reuse?
I wouldn't re-use the trunions either, when I bought mine they came with the comp trunions installed. But I was a little skeptical about that and I ended up installing CHE bushed trunions instead. I had no idea that the rockers were not OEM until I broke one and contacted the seller afterwards. You are the third person that I've seen with a broke rocker from them.
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Old 05-21-2019, 12:59 PM
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What and where do I get new rockers and trunnions? Or is there a better rocker I should upgrade to?

I see btr has em for $330.
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Old 05-21-2019, 01:31 PM
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I'd buy some OEM rockers from someone here or another trusted seller and I'd use a bushed type trunion kit instead of the roller needle bearing kind. I went with the comp cam bsr shaft rocker which is basically an OEM rocker installed on a shaft.
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Old 05-21-2019, 07:32 PM
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The rockers have er360 printed on them, which comes up as enginetech brand via google
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Old 05-21-2019, 09:18 PM
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Stock rockers with the bushing upgrade would be best as the other options will lead to needing new pushrods.
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