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Join Date: Jan 2018
Posts: 878
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Early 911 rocker questions
67 S engine. Doing a top end freshen up. It was noticed that some of my rockers where forged. So I got some good used cast ones to suit the rest. Upon assembly these don't have a bronze bush like the ones I have. Can I mix them. Are they any good. Also they have short shafts and small bolts which I can swap out
Lyndon  
Last edited by Lyndon302; 07-14-2020 at 02:33 AM.. |
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07-14-2020, 02:27 AM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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cast & forged
They are different weights for starters.The early cast rockers that did not have the bushings used a rocker shaft with a black anti-scuff dry film.The forged rockers weigh about 20 grams less.Ciao Fred
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07-14-2020, 05:40 AM
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Join Date: Jan 2018
Posts: 878
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Ok so I can't use them with my polished shafts. Can get them bushed ??
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07-14-2020, 09:29 AM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,742
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I recall reading in Bruce Anderson's book about the early cast versions that weren't bushed. Back in the day when rockers were cheap, people usually tossed them. I'd imagine it should be fine to have a machine shop bush them. It might be wise to resurface them as well if you go that route to make sure they're flat with the cam lobes.
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07-14-2020, 11:48 AM
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I will get them bushed. I have 5 to do.
Thanks. Lyndon |
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07-14-2020, 01:55 PM
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Join Date: Apr 2007
Location: OC
Posts: 824
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Good luck ! I haven't found anyone willing to rebush these rockers , Ollie's told me they were just junk . Forged and cast rocker ratios are slightly different , cannot be used in the same engine .
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07-19-2020, 07:46 PM
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