I have the SA RR's out of the hot cam kit. I upgraded to a set of LE1 Heads and a few other options. Anyway my problem is that the retainers are hitting the rockers before the tip comes close to touching the valve.

Do I just need to grind these down? Is that going to kill the rockers strength? I'm kinda in a bind here and don't want to have to buy new rockers unless I have to.

Gonna go NSA this time if I have to though...

 

Do you have beehive springs?

 

I have ground a fair amount off aluminum rockers in that situation, though I am sure that you could grind off "too much" and cause a problem. What diameter spring are you using? Is your pushrod length way off?

Rich

 

Are your push-rods the correct length? If not that could be your "root problem" and the rockers touching only the symptom of the problem.

WD

 

Where exactly is the rocker touching the retainer?

 

You might be able to get differant retainers that expose more of the valve tip.

 

The tip of the valve is not even close to touching the roller. I was able to grind down the tip some and now that part fits.

The body of the rocker is just a little large and no matter where I put the rocker on the stud it still touches just the tip of the keeper. I can't even check pushrod length till I get that done.

I think I will take a little off the inside of the rocker and go from there... good idea?


edit: forgot to add. I'm pretty sure these are the basic springs that come on the LE1 heads. not positive though. They are double spring type.

 

It sounds like your heads were set up for nsa rockers and guide plates

 

what does that mean exactly. I mean I know the difference but I did not know there was a difference in the way the springs were set or the head was machined.

I thought you just threw on some plates and NSA rockers and were done. well not that easy but I did not know that changed the head.

 

First off when the heads are assembled, they are set up for what the customer has in mind for their engine. The cam is going to determine what type of springs are going to be used. High lift cams need taller springs or bee hive style because of spring bind. Were these heads used?

 

And how did you measure your pushrod length with the rockers not being able to work right?

 

I said I did not measure the pushrods. I couldn't get the rockers on to measure.

I purchased the heads and cam as a combo... it's a cc306 an le1 heads. I asked person that I got it from and it has crane 10308 springs on it.

 

I would bet the geometry is off in your vlave train components

 

ok guys am I missing something... don't the rocker arms have to fit before I can have geometry issues? I'm thinking the GMPP rockers just don't support that large of a spring diameter.

I ground down one of the rocker to where it goes on and it fits well and every thing looks good all the way through the valve event. BUT the poly locks don't gon on the stud as much as I would like.

Can someone give me more info on the NSA setup? aer the studs taller than for SA rockers?

 

It's really hard to analyze w/o seeing it. The GMPP rockers are Crane's, aren't they? If so, you could call Crane and ask about maximum spring diameter. What is your spring diameter? Are you sure the pushrods aren't just way too short? You can get locks in a variety of different dimensions.

Rich