Edelbrock Head/Guideplate Adjustment Question: PLEASE HELP

Problem Jim had with stock stamp steel rockers. For one .580" is a little to much lift even for our shaft mounted stamped rockers. Yes, I know there are folks out there doing it but around .550" depending on tip height the rocker will rock to the outer edge of the valve and start scrubbing. As mentioned, "you want to talk about the rocker dancing a hula across the tip of the valve". Well, stock type rockers do travel across the valve, what you seen is correct, they are designed to. They actually rock across the valve tip which leaves a much wider pattern than a properly adjusted roller rocker. But with higher lift cams they will run out of area on the valve tip, I found this to be in the area of .550" lift. As far as the #6 pushrod jumping out of the rocker, somehow that rocker, lifter, pushrod and valve ended up with some play at rpm.
Folks, in the photo's we've seen here, heads with rockers that are still not straight, the tip of the rocker is still not square to the valve and will side load. It's better with the adjustable guide plates that's why the noise drops but not fixed. If there were offset stud mount rocker readily available with the proper offset I think they would work. I do not feel there would be much if any side loading on the stud. The guide plate and pushrod will see the load if any. What would cause the load, is if the pushrod was not straight, it would then get pushed to one side or the other. A offset stud mounted rocker with a shaft would have no idea of it's design. There would be know reason for it to try and side load the stud. The stud is straight with a shaft that fits reasonable to it in the rocker with a nut that screws on square to the stud and square to the shaft. As long as that rocker gets pushed straight up it thinks it's on a long shaft and it shouldn't side load. No different than the rockers on the stock Buick. I will mention that it has been proven that stud type rockers put to higher load conditions tend to not fair favorably. Remember, the reason these types of rockers are put to use is because there inexpensive. Make an offset rocker properly for the Buick with a stud set up and it's now custom, small run part, cost goes up. Stay with the std Buick roller set up.
Derek, your idea is good, to build a bar mount system which there are more offset rockers to chose from but I think you might be surprised how much you would end up having in these to compete with the std Chevy style stud rocker, because ultimately that's what were talking about here. Let me know what you find out, I will look as well

 

Much simpler to just go with the TA heads aye.

 

Mike: A couple questions regarding your TA-1309C-1.60B roller-tip self-aligning rockers for studs:

1 - The camshaft section of the TA catalog includes recommendations for stock-vs-roller rockers for each cam.
-In general, should we limit the use of the TA self-aligning roller tip rockers to grinds that the catalog indicates "Stock Rockers OK"?

2 - As usual, I'm complicating things by flip-flopping between the TA 290-94H (.491"/.502" lift @ 1.60:1, "Stock rockers OK") and the TA 288-92H (.525"/.525" lift @1.60, TA roller rockers... recommended") for my build. My springs are 290# @ .525" valve open dim.
-Is it safe to use of the TA roller tip self-aligning rockers with the TA 288-92H cam?

3 - My Eddie heads are equipped with 7/16" studs.
-Are those rockers also available for 7/16" studs?

That's it! Thanks Mike.

 

Dan,
.525" with 290 open is fine. with stock rockers. There used to be 1.60 stock chev rockers out there, but I'm not a chevy guy, you would need to dig. The catalog has recommendation, gotta draw some color of a line in the sand, somewhere. Both type of rockers would be safe, but if there were any small issues with valve tip height/rocker geometry etc... the TA1309D-1.60B would be the better choice. If the stock rocker was getting close to the edge of the valve because of lift, the roller wouldn't care.
TA1309D-1.60B would be your part number for use with 7/16 studs

 

I got a question for Mike and J.W., why not just mill down the stud holes and buy individual shaft mount roller rockers with correct offset? They are literally thousands on manufactures that sell these and some are very cheap in price but very high quality. By going to Buicks long shaft mount you still gotta do a ton of machining too. This is where someone needs to have it done both ways ( Buick long shaft way and individual shaft mount way and know what it takes to correct the problem to help out in the future.

 

Hi guys, where do we buy these adjustable guides.I have one rocker so far off that the rocker itself is touching the valve not the roller part,and you can see the damage its doing to the valva top Thanks Chris

 

https://www.summitracing.com/oh/par...google-_-shopping-_-srese1-_-isky-racing-cams

Remember, you have to modify these to work. Deepen the slot for the pushrod, and modify them around the top for your valve cover as required.


JW

 

Thank you Jim and everybody, I will have them by next weekend and if weather is good i will get them installed and let you know how they work out,Thanks Chris:TU:

 

Hi everyone,I just got my new adjustable guide plates and as the weather is so good here i will be working on them the next few evenings.The engine is a 455,30 over TA212 cam and ported/polished Eddy heads and roller rockers, This motor has been running all last Summer and the little tick/tick drives me crazy,My question is do i set preload when the engine is up to running temp, or cold Thanks Chris :TU:

 

Thank you Larry, I would not have thought that,so thank you Buick v8 again.:TU:

 

Hi guys. I started working on doing the install of my new adjustable guide plates and for anyone that is thinking about doing this job all i can say is bring a case as a six pack wont do it, A lot of grind, tighten/loosen adjust take off,put on,and its something you cant rush :TU::TU: Enjoy

 

Hi again everybody,I would love to tell you all that everything went smooth with my install of the adjustable guide plates,but no,I finished all the work this morning and fired up the car and to be honest i wish i never started.I have a lot of time put in on this and i dont think i have made much difference as far as the noise goes.This job i am sure could be done faster ad better by a pro,but i spent a great amount of time with the plates,trying to get them close so i am going back to my regular guide plates that came with the heads till i can talk to TA and see what they come up with as a solution,Thanks Chris

 

Not sure what issues your having, this is something I have done 3 times now with great success.

Take the valve covers off right now, don't touch anything, and post detailed pictures. Maybe we can see something.

I will save you the call to TA, they are just going to tell you to put the old pivot ball rockers on with the roller tip.

I would not be waiting for them to come up with a solution to a competitors issues..

JW

 

Yeah... I would think that unless your cam is pretty darn aggressive, a set of high quality stamped-steel, pivot-ball rockers (with or without roller tips) would look like a really attractive option right now. Besides, if you chose the Edelbrocks to keep the cost of the project at a reasonable level, then a set of pivot-ball rockers would be the logical choice anyway.

Good luck, regardless of what you end up doing.... And let us know how it all works out.

 

Hey Christy....
Were you able to resolve this issue? If so, how?

 

No and i am done with the adjustable guide plates as i dont see/hear any difference I have called TA a few times but no reply, I will live with the ticking for now as i want to do other work to the car before summer gets here,Thanks everybody and maybe next winter i try again

 

I would have to say that the Edebrock heads are not the only thing making noise here.. adjustable guideplates or pivot ball rockers won't do a think for noisy lifters, or a noisy cam grind.

JW