 1.7 Rocker Arm Modification |
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| Highland |
 Aug 27 2012, 04:12 PM
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#1
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Senior Member  Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California  |
I just want to make sure I'm milling the right area for the 1.7 rocker arms to fit the 911 swivel foot adjusters.
Can someone confirm for me the attached picture is correct? Is +/- .005" good enough? Attached File(s) 
1.7_Rocker_Arm.pdf ( 375k )
Number of downloads: 302 |
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| SLITS |
Aug 27 2012, 04:51 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
You are most certainly correct Sir!
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| mrbubblehead |
Aug 27 2012, 05:50 PM
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#3
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Twodollardoug Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California |
the pdf wont open for me. but i countersinked my holes also. it just gave me a little more room for the foot...
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| dirk9141973 |
Aug 27 2012, 06:49 PM
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#4
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Unregistered |
Is it uncommon to having to shim under rocker arm ? building 2056 with cam and stock rocker arms and push rods all the valves adjust great but had to shim under blocks to provide clearancs.?
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| yeahmag |
Aug 27 2012, 07:49 PM
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#5
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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The usual answer is "it depends...", but I've never built a non-stock motor and not had it to shim.
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| jaxdream |
Aug 28 2012, 08:21 AM
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#6
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Senior Member Group: Members Posts: 974 Joined: 8-July 08 From: North Central Tennessee Member No.: 9,270 Region Association: South East States |
If you do the mod and use the feet , you should do a rocker arm geometry check . Also you may have to get a set of longer / shorter pushrods . Do a search on rocker arm geometry , should find a lot explaining the process.
Jack |
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| gothspeed |
Aug 28 2012, 09:08 AM
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#7
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
QUOTE(mrbubblehead @ Aug 27 2012, 04:50 PM)  the pdf wont open for me. but i countersinked my holes also. it just gave me a little more room for the foot... +1 on the addtional countersink (IMG:style_emoticons/default/smile.gif) ............ it allows for the foot without having to remove as much material from the face. I think I saved .020" of what normally would be removed. |
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| Valy |
Aug 28 2012, 02:18 PM
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#8
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Senior Member Group: Members Posts: 1,675 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
Make sure you don't create a step in the arm. Forces will concentrate on the corner of that step and brake the arm.
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| gothspeed |
Aug 28 2012, 04:16 PM
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#9
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
QUOTE(Valy @ Aug 28 2012, 01:18 PM) Make sure you don't create a step in the arm. Forces will concentrate on the corner of that step and brake the arm. true! mine were all deburred and almost polished on the edges ..... (IMG:style_emoticons/default/smile.gif) |
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| dirk9141973 |
Aug 30 2012, 07:04 PM
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#10
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QUOTE(gothspeed @ Aug 28 2012, 03:16 PM) QUOTE(Valy @ Aug 28 2012, 01:18 PM) Make sure you don't create a step in the arm. Forces will concentrate on the corner of that step and brake the arm. true! mine were all deburred and almost polished on the edges ..... (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beerchug.gif) had one hell of a time getting the push rods and rocker arms seat why? No longer need shims under blocks !! |
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