Shimming Rockers

That's what I'm hearing. I been looking at the pro comp and its top of my choices. I'm ready to spend some coin. From the info so far I see shimming is inescapable. I was also considering Hughes. Are they worthy?

I would have to agree with that. And in my case the block deck is stock, and the heads are Edelbrock never shaved. The Cats had .50+ left to right slop, I was hoping to purchase some new ones where that does not need to be addressed.

What cam are you running?

564/257. Its a 440 source stroker to 528 bottom end.

..a 1/2" slop?
..Crane tech recomend you shim to .013 clearance

Sorry, .050 slop. I have it down to approx .015 with shims galore.
What about Hughes, I have been hearing good things?

...O.K. now that they are correctly shimmed, what is the problem?

I'm ready to trash the cat rockers. I was looking to make a upgrade. I was wondering if any rockers were offered that were precision enough to not need shimming.

..i have an older set of Crane Gold 1.5 and originally assembled them without shims.there is some slop and they are a little noisy.
.i don't think it matters for normal driving..it's just annoying.
i recently got a quantity of shims from Crane and wonder if installing them will make them a little quieter?

The noise of the cats is why I hate them, shimming helped. Also the tubes the push rods travel through the Edelbrock heads is not exactly generous. I was either rubbing or it looked very close until I shimmed. I just wondered if the finer of rockers made out there fit without shimming the slop.

..thanks Wolf,that's what i was wondering.
..i have heard that all roller rockers are a little noisy...say 'kinda like a sewing machine..
hope some other guys will chime in on this...

bump

Shims on the shaft are normally necessary with custom parts (rockers, holddowns ect.) to line up the rockers and valve stem heads. I had to do it and lots of others have as well.

That said, there are good reasons not to use the cat rockers from what I've heard. The "pro magnums" sound like a good choice.

get shims from Hughes , Mancini , etc..

you want .015 to .030 clearance. Keep in mind some of the hold downs can be moved a little to change clearance.

If the question i sdo any come without shims, the answer is some come with springs but shims are the correct way to center the rocker. The better sets of rockers still use shims. It's part of the engine building process on a performance engine.

I'll also ad to JohnRRs answer on shimming the rocker shafts to correct the geometry that the valve job is the only thing on a saddle type shaft rocker that affects geometry. Well, sometimes different rocker ratios and manufacturers might a little too, but it's basically the valve job.