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Rocker Studs and Guide Plates

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WesternRed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Topic: Rocker Studs and Guide Plates
    Posted: Mar/11/2018 at 5:38pm
Can somebody tell me what length rockers studs are used to convert the 291C heads to adjustable rockers and what guide plates are used?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/11/2018 at 6:18pm
Originally posted by WesternRed WesternRed wrote:

Can somebody tell me what length rockers studs are used to convert the 291C heads to adjustable rockers and what guide plates are used?



Think I've always used ARP 7/16" small block Chevy rocker studs.

Shouldn't need guide plates on those heads. The pushrod hole is barely big enough to fit through as cast.

-Steve-
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Mar/11/2018 at 6:37pm
Should add that I have Harland Sharp rockers for 3/8 studs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 8:03am
Turns out the heads are 993 castings, so it looks like it's a late 71 motor with lower compression (helps to explain 130 psi on the compression test), but I did see that the heads have slots for the pushrods, so definitely no guide plates required, just add rocker studs and it should be good to go.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 7:59pm
Originally posted by WesternRed WesternRed wrote:

Turns out the heads are 993 castings, so it looks like it's a late 71 motor with lower compression (helps to explain 130 psi on the compression test), but I did see that the heads have slots for the pushrods, so definitely no guide plates required, just add rocker studs and it should be good to go.
I recommend compcams low profile.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 8:19pm
Do you have a part number? Comp lists as "High-energy", magnum and so on - nothing mentioned about dimensions or low profile in the searches I've been doing for my 73 360
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 9:14pm
This post has info:
http://theamcforum.com/forum/rocker-arm-studs_topic56217_page2.html
Comp states 1.750" long.
There was a post that stated to use straight studs for the Scorpion you have. If that is the case you can make your own and cut the length you need:
https://www.fastenal.com/products/details/47455
A little above grade 5 for yield strength but not grade 8 that is to hard for the application. This is tempered chrome-moly steel.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 9:27pm
Hmmm, that's pretty good info. Thanks.
I suppose I could also chuck up each stud and shave off the "shoulder" portion....... but that's a bit more work.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 9:34pm
Originally posted by billd billd wrote:

Do you have a part number? Comp lists as "High-energy", magnum and so on - nothing mentioned about dimensions or low profile in the searches I've been doing for my 73 360
These are them. https://www.summitracing.com/parts/cca-4502-16
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 9:45pm
My rocker arms are for 7/16" studs...... SCP1055BL 

So that would be the 4501-16 and wow another almost 20 bucks for a 7/16 vs 3/8" wow
35 to 54 bucks just going from the 4502 to the 4501
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