Rocker Arm Pivot Replacement
Thread Starter
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
Rocker Arm Pivot Replacement
I'm rebuilding the '73 factory engine to original specs (190 hp) and in doing so, noticed wear on these parts. Three are unblemished, six have some light wear lines, and the rest have some pretty deep gouges on them.
Question is; How much wear makes it necessary to replace these guys?
TIA.
Steve
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
I think u can get replacements that have deep groves for added lubrication. Wear on the pivot ***** indicates a problem in the vlv train. Inadequate lubrication, overstress from high spring press, overspeed (>6,000rpm), cam lift > 0.5". U may want to review your vlv train set up again.
I think comp cams sells them separately. Make sure u buy the ones with as deep grooves as u can get.
I think comp cams sells them separately. Make sure u buy the ones with as deep grooves as u can get.
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
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2017 C2 of Year Finalist
You can get them from any parts store from Sealed Power. Ck rocker arms closely for wear also. Wear of those two parts goes hand in hand.
JIM
JIM
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
Stock arms range from 1.35 to 1 to 1.45 to 1 ratio. Quality control and maintaining exact ratios just wasn't a priority and wear factors in as well. Modern production methods produce a much better product. Replace them. If you don't want to go roller use Comp or Crane to get true 1.5 ratio's. Check pushrods while it is apart. Blow through them, roll them on a real flat surface to check for straight and check the ends for excessive wear. The nuts are self locking. once they are off and on a few times that feature is lost.
http://www.summitracing.com/parts/cc...make/chevrolet
http://www.summitracing.com/parts/cc...make/chevrolet
Last edited by 63mako; Mar 22, 2015 at 04:03 PM.
