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#887177 - 07/27/11 11:37 PM rocker arm/pushrod problem  
Joined: Aug 2004
Posts: 1,383
Atl_Monte Offline
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Atl_Monte  Offline
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Joined: Aug 2004
Posts: 1,383
Atlanta, GA
I've run into an issue while trying to select the proper pushrod lenght for my 95 LT1. First off the first problem I ran into was I told I need to upgrade my rocker studs due to the extra lenght on hte stud for the roller rockers, so I did this and ran into my first problem the bottom portion of my aftermarket studs were to long and bottomed out in my aluminum head before properly seating so the store gave me some washers that corrected this problem so onto my current problem of trying to determine proper pushrod lenght the stock rod appears a little to long as the tip of the rocker is not hitting dead center of the valve tip but when I try to use my pushrod length checker set on a shorter rod the bottom of the roller rocker housing comes in contact with the base of the rocker stud, if seems if I didnt have the washers under the studs I'd have a few more thousandths of clearance....but for now I'm stuck at a stand still not sure which direction to go it seems the fix would be ot find some rocker studs that are meant for roller rockers but not guidplates...


1988 Monte Carlo SS fully customizedm, cowl hood, Kandy paint w/ ghost flames, power sunroof, 24" rims 327 SB - SOLD

1986 Monte Carlo SS 350 create motor, cowl hood, shaved handles & trunk, power sun roof, digital dash
http://youtu.be/aKZI0FhUP6U

1984 H/O Cutlass lightning rods 8.5" rear LT1 and C5 brake conversion under way 24" rims
#887256 - 07/28/11 12:30 PM Re: rocker arm/pushrod problem [Re: Atl_Monte]  
Joined: Jul 2001
Posts: 4,430
Joe87monteSS Offline
10+ Year
Joe87monteSS  Offline
10+ Year
Member

Joined: Jul 2001
Posts: 4,430
Memphis,TN
A few questions:

Are these factory aluminum LT1 heads?

Are you using guideplates?

Which stud did you get, the one for guideplates or without?

Were the heads milled, or the block decked?

You shouldn't have needed to change the studs for roller rockers.


Joey
Engine/head builder/machinist
1987 Monte Carlo SS 383/4 Speed
2004 Silverado
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#887266 - 07/28/11 02:08 PM Re: rocker arm/pushrod problem [Re: Joe87monteSS]  
Joined: Aug 2004
Posts: 1,383
Atl_Monte Offline
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Atl_Monte  Offline
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Joined: Aug 2004
Posts: 1,383
Atlanta, GA
I wasn't thinking I needed to change the studs either but most forums I read suggested it. Yes these are factory aluminum heads, I didn't have the block or heads milled not to say the machine shop didn't do it No I'm not using guide plates though I believe the the studs they gave me were intended to be used with them hence the need for the washer under nest them and the comment made by the sales person that most aftermarket studs were intended for use with guide plates :-/


1988 Monte Carlo SS fully customizedm, cowl hood, Kandy paint w/ ghost flames, power sunroof, 24" rims 327 SB - SOLD

1986 Monte Carlo SS 350 create motor, cowl hood, shaved handles & trunk, power sun roof, digital dash
http://youtu.be/aKZI0FhUP6U

1984 H/O Cutlass lightning rods 8.5" rear LT1 and C5 brake conversion under way 24" rims
#887347 - 07/29/11 12:21 AM Re: rocker arm/pushrod problem [Re: Atl_Monte]  
Joined: May 2006
Posts: 5,606
BuzzLOL Offline
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BuzzLOL  Offline
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Posts: 5,606
Toledo, Ohio
.. The rocker usually doesn't touch the valve in the middle of the stem to start with, but slightly toward the rocker from center, then halfway through lift, moves past center to away from rocker, then at max lift, back across center and toward rocker again... hopefully, this info will alleviate what's causing your concern...

.. You didn't specifically say it, but I'm assuming you thus have the self-guiding rockers... and the matching retainers/valves that allow the valve tips to stick up sufficiently for the rockers to guide on them... and checked retainer to seal clearance/valve spring coil bind for the lift of the cam being used?


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#887377 - 07/29/11 03:36 AM Re: rocker arm/pushrod problem [Re: BuzzLOL]  
Joined: Aug 2004
Posts: 1,383
Atl_Monte Offline
Member
Atl_Monte  Offline
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Joined: Aug 2004
Posts: 1,383
Atlanta, GA
Yes I have self aligning rockers and I'm trying to determine the correct pushrod length


1988 Monte Carlo SS fully customizedm, cowl hood, Kandy paint w/ ghost flames, power sunroof, 24" rims 327 SB - SOLD

1986 Monte Carlo SS 350 create motor, cowl hood, shaved handles & trunk, power sun roof, digital dash
http://youtu.be/aKZI0FhUP6U

1984 H/O Cutlass lightning rods 8.5" rear LT1 and C5 brake conversion under way 24" rims

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