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Author Topic:   adjustable valve-train question

Posts: 167
From: Tucson, AZ
Registered: Feb 2000

posted 04-04-2001 11:53 PM     Click Here to See the Profile for Boss66   Click Here to Email Boss66     Edit/Delete Message   Reply w/Quote
My question is about the poly-lock nuts that hold the rockers down and are used to adjust the valves. The little allen screws that screw in the top of the nut and lock in the adjustment only have a few threads before they hit the rocker stud, when the valves are properly adjusted. I'm afraid a few of the ones with the least amount of threads might come loose. What can I do? Put a spacer underneath the nut? Use longer pushrods? Has anyone else run into this situation?

Thanks, Boss66

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Posts: 9555
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-05-2001 01:18 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote

If you use a spacer make sure they are hardened. Comp Cams and Crane sell a "kit" for making early 351w heads "adjustable". It consists of hardened washers and lock nuts. Throw the lock nuts away and use the hardened spacers, unless you know where to get hard washers. Don't use normal washers, maybe grade 8 washers will work?!?


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Butch Jennings

Posts: 634
From: No. California
Registered: Apr 2000

posted 04-05-2001 08:30 AM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

You didn't specify what size the studs are, if they're 7/16" I'd use a head bolt washer, provided your rocker arm geometry is correct.


Butcher's Home Page

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Posts: 93
From: Marietta,GA
Registered: Mar 2001

posted 04-05-2001 09:00 AM     Click Here to See the Profile for Tom351   Click Here to Email Tom351     Edit/Delete Message   Reply w/Quote
You could get shorter studs.

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Posts: 27660
From: Lyons, IL, USA
Registered: May 99

posted 04-05-2001 11:16 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
A little dab of Loctite and some judicious tightening will work fine also.

Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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