Page 1 of 6 1234 ... LastLast
Results 1 to 15 of 76
  1. #1
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

    Default rolla rocker troubles

    just wondering if any one has had problems with yella terra roller rockers ?
    I am building a 355 stroker fairly mild, put on the rolla rockers and started adjusting and noticed the pushrod is so close to the cylinder head its practically scraping .
    some basic info , the motor is a 304 out of a vt ss , roller .
    came is crane 888241
    lunati tie bar lifters
    the heads are standard iron heads.

    * I have tried swapping bak to the factory rocker arms and the push rods are perfectly in the centre of the guide holes.
    * tried the factory rockers with both the lunati lifters and the standard lifters , both ways the push rod is centred
    * I have an adjustable push rod - lunati. and have put the push rod shorter than what crane recommends and longer .
    * I have done an impression to check the valve train geometry and the marks I get are in the centre of the valve at the correct thickness.
    * I have tried an older set of rolla rockers still yella terra and they are still slightly too close but better.
    * I have contacted yella terra with pics and they have told me they are the correct rockers.
    * my head specialist is amazed, and yella terra says its unusual.

    any one have any ideas?
    obviously I could buy another set of rockers , but at $1000 a set i'm reluctant to waste any money on what I cant return .

  2. #2
    casual poster
    Join Date
    Nov 2018
    Location
    Sydney
    Posts
    255

    Default

    Do you mean the p'rod is closer to the rocker stud? Maybe you have higher ratio rockers which would do this.

  3. #3
    Senior Member
    Join Date
    Feb 2013
    Location
    lurking in the shadows
    Posts
    468

    Default

    Presuming they are shaft mount rockers, have you tried changing the pedestal height?

    Are the pushrods too close to the valve side or manifold side of the hole?

  4. #4
    casual poster
    Join Date
    Aug 2009
    Location
    Darwin
    Posts
    104

    Default

    Quote Originally Posted by HDT166 View Post
    just wondering if any one has had problems with yella terra roller rockers ?
    I am building a 355 stroker fairly mild, put on the rolla rockers and started adjusting and noticed the pushrod is so close to the cylinder head its practically scraping .
    some basic info , the motor is a 304 out of a vt ss , roller .
    came is crane 888241
    lunati tie bar lifters
    the heads are standard iron heads.

    * I have tried swapping bak to the factory rocker arms and the push rods are perfectly in the centre of the guide holes.
    * tried the factory rockers with both the lunati lifters and the standard lifters , both ways the push rod is centred
    * I have an adjustable push rod - lunati. and have put the push rod shorter than what crane recommends and longer .
    * I have done an impression to check the valve train geometry and the marks I get are in the centre of the valve at the correct thickness.
    * I have tried an older set of rolla rockers still yella terra and they are still slightly too close but better.
    * I have contacted yella terra with pics and they have told me they are the correct rockers.
    * my head specialist is amazed, and yella terra says its unusual.

    any one have any ideas?
    obviously I could buy another set of rockers , but at $1000 a set i'm reluctant to waste any money on what I cant return .
    what pn rollers do you have?

  5. #5
    casual poster
    Join Date
    Sep 2011
    Location
    perth
    Posts
    248

    Default

    I take it they are bolt on adjustable, if so you cannot change geometry via pushrod length without changing pedestal height first

  6. #6
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,942

    Default

    You might need to shim the pedestal up, did they supply washers?

    Its a hydraulic roller cam so I hope you are checking all this with a light checking spring so as not to collapse the plunger on the lifter...

  7. #7
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

    Default

    the part number is yt 6309 .
    I have tried changing the height of the pedestal up and down with the supplied washers.

    the pushrod is very close in the head guide hole on the exhaust side ( close to the spring )

  8. #8
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,942

    Default

    Quote Originally Posted by HDT166 View Post
    the part number is yt 6309 .
    I have tried changing the height of the pedestal up and down with the supplied washers.

    the pushrod is very close in the head guide hole on the exhaust side ( close to the spring )
    Are you checking it with a light checking spring? Not the springs that you are going to use

  9. #9
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

    Default

    no I am using my springs as heads are on the block already

  10. #10
    Senior Member
    Join Date
    Feb 2017
    Location
    Melbourne
    Posts
    447

    Default rolla rocker troubles

    A picture tells a thousand words....

    And maybe a few details like cam spec, how much have deck & heads been skimmed, length of current pushrods etc.

    Just pull the valve springs off on one cylinder and fit a set of checking springs and go from there with just a set of Roller Rockers on the cylinder. That way the lifter plunger can at least move and not be bottomed out with your heavy valve springs.
    Last edited by 46Crab; 21-06-2019 at 06:12 PM.

  11. #11
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

  12. #12
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

  13. #13
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

  14. #14
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

    Default

    those 3 are the rolla rocker push rod clearance

  15. #15
    casual poster
    Join Date
    Jun 2018
    Location
    wa
    Posts
    32

    Default

    standard 2.jpgstandard3.jpg

    these are the standard rockers . you can see they are perfectly in the center of the guide hole

Page 1 of 6 1234 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. rocker cover spacers for standard rocker covers?
    By ryan350 in forum Holden V8's
    Replies: 20
    Last Post: 16-01-2015, 10:42 PM
  2. v8 ke55 rolla, vs statesman and old fairlane skid video
    By wagn8u in forum Images & Videos
    Replies: 0
    Last Post: 17-02-2011, 08:35 AM
  3. yella terra rolla rockers 4 sale
    By HQ STATESMAN in forum For Sale Items
    Replies: 6
    Last Post: 19-10-2010, 11:35 PM
  4. cam choice for a 5L vt rolla
    By tonnafun in forum Holden V8's
    Replies: 1
    Last Post: 24-04-2010, 10:10 PM
  5. v8 rolla in the build
    By wagn8u in forum Conversions, Rebuilds & Project Cars
    Replies: 28
    Last Post: 21-06-2009, 08:21 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •