We have all heard about CMI header issues but
#1
How about Crane rockers?
Well my Mercury racing 700's have them
i know they have been around forever and have been used in everything with great results.
Well last year i had one fail at LOTO. mechanic thought it was just a fluke and the rest looked good. well few trips later another one lets go.
so time to pulll them all out and change them. well turns out that there where a few that were failing,
both motors have parts of bearings thru them, not a good thing.
Did a little bit of research and it seems in 2008 Crane went to a different manufacture of the bearings and it can be a hit of miss on them, Just like testing
cmi headers i would advise swapping out the crane rockers. way cheaper than what i'm going thru.
With only 160 hours on them i now get to rebuild both motors
Looking forward to this summer with couple brand new motors

Well my Mercury racing 700's have them
i know they have been around forever and have been used in everything with great results.
Well last year i had one fail at LOTO. mechanic thought it was just a fluke and the rest looked good. well few trips later another one lets go.
so time to pulll them all out and change them. well turns out that there where a few that were failing,
both motors have parts of bearings thru them, not a good thing.
Did a little bit of research and it seems in 2008 Crane went to a different manufacture of the bearings and it can be a hit of miss on them, Just like testing
cmi headers i would advise swapping out the crane rockers. way cheaper than what i'm going thru.
With only 160 hours on them i now get to rebuild both motors
Looking forward to this summer with couple brand new motors

#2
Holy crap!! Are these the standard crane golds that have been in everything for like ever?? lol I have them in mine and I'm now getting nervous! Any pics of the failed rockers and what's going on with them?
#10
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Joined: Nov 2004
Posts: 14,068
Likes: 3,668
From: On A Dirt Floor
Good eye. The nut Looks like they are hitting the rocker.
On the Crane Golds, yeh…the old standard ‘good one’s’ had s squarer back , and a few had to be ground to clear some rocker cover bolt hole locations on int valve/ manifold side.
On the Crane Golds, yeh…the old standard ‘good one’s’ had s squarer back , and a few had to be ground to clear some rocker cover bolt hole locations on int valve/ manifold side.









