broken polyloc question

What causes a poly loc to break? I broke one on sunday @ WOT! I am going to buy a new set but want to know what would cause this....
396

Many things. Can you post a picture of it?
PS Please tell me it is not a 12 point head. . . .

What causes a poly loc to break? I broke one on sunday @ WOT! I am going to buy a new set but want to know what would cause this....
396
I have two brand new sets. Let me know;
Two sets of Hi Tech Poly Locks for 7/16 studs #4000-16 for $45.00 each set.
Make it $35 being its Christmass and I will send them out today.

That bad ass engine you got broke them f---ers. Either that or them big guns you use to tighten them.

What type of rockers do you use, and do you use a girddle? How much cam shaft? MP

Thanks for the replys guys. I stopped by bergeron marine and showed them. They said that the studs are too short. I am running comp stainless full rollers without a stud girdle. My cam is a clay smith solid .615 lift,258@.050,108 lobe

That bad ass engine you got broke them f---ers. Either that or them big guns you use to tighten them.
Your silly taylorman;);)

If you look at the posi lock it is quite small in the "shank" area. Without adaquate stud engagement, and without a girgle, all the strain of the rocker is directed at the weakest point of the posi lock . I would strongly suggest a girdle of some sort, even a "J mar" is better than nothing, and will work just fine as long as you don't have to run valves between races...........Another thing to check is the rocker spotface, was it up? or down? If installed wrong that will split the posi lock because it tightens down on a round surface...MP

@ the subscribers request this phone does not accept incoming calls.
What the hell Mike ???

after talking with jim we figured that my pushrods are too long. I have a "0" deck block and milled heads :mad: :mad:

Michael, I just talked to ST...your p/r's are definately too long. Gotta check that stuff when you start whackin on block and heads. You don't have enough thread engagement with your polys...it's not the studs that are too short. Min engagement should be 6-7 full turns, but what's more critical is rocker geometry.

Michael, I just talked to ST...your p/r's are definately too long. Gotta check that stuff when you start whackin on block and heads. You don't have enough thread engagement with your polys...it's not the studs that are too short. Min engagement should be 6-7 full turns, but what's more critical is rocker geometry.
Very true. I will fix that real quick;) Oh and tell jim I am going to kick his a$$ for leaving me on hold for soo looooooong! :crossx: :crossx:

Very true. I will fix that real quick;) Oh and tell jim I am going to kick his a$$ for leaving me on hold for soo looooooong! :crossx: :crossx: Dammit Jim! LOL. :D

There are several push rod length gages available, look at Herbert or PAW, they both sell them...Don't guess..............MP