Stroker/Cam/rocker Question!

[det_riot]

Hey guys, this isnt about my car, but a buddy's car. He's got a 347 stroker and has had a pretty good rocker tick the entire time he's had the car. he doesnt drive it often enough for it to bother him but as of now he wanted to start working on it and getting it tuned finally so we decided to readjust the rockers. the process that i used on my car and i assumed would carry over to his car goes as follows:
Rotate crank until cyl 1 exhaust valve just starts to open. then adjust the intake rocker to zero lash, turn back the allen head 1/4 turn, and tighten the entire nut 1/4 turn to lock it into place.
Then do the exhaust valve when the intake valve just beings to close after opening.

After buttoning up for the last time, there was still so much rocker noise than there was before. So we took it apart again and tightened them to 1/2 of a turn. Is it possible that it could take 3/4 of a turn???

Here's the one thing that threw us off though.....we found a sheet in all of his old paper work on the car, that shows how to adjust the rockers and in there it said to adjust the exhaust valve just as the intake valve starts to open. The issue with that is as the intake valve starts to open, the exhaust valve is still closing?? Is it possible that these instructions are put in this way to account for preload in the lifters? When i get back over there i'm going to follow it to the instructions on the sheet but I'm just a little bit confused on why this procedure is so different than what I have been doing before.

 

[ryclef331]

no you're doing it right. How old are his lifters? After setting the lash, push the rocker down towards the pushrod, the lifters shouldn't budge. If they do he may have a bad lifter somewhere. What I would reccomend, is back out the allen key set screw more. Adjust to zero lash, tighten the nut an extra 1/2 turn, then screw in the set screw. The way you described kinda sounds like you may not be getting a full 1/4 or 1/2 turn. They should be able to take 3/4 of a turn but not require it. If the lifters are going south, the extra 3/4 of a turn will make then collapse and bottom out sooner and probably more noisy.

 

[det_riot]

no you're doing it right. How old are his lifters? After setting the lash, push the rocker down towards the pushrod, the lifters shouldn't budge. If they do he may have a bad lifter somewhere. What I would reccomend, is back out the allen key set screw more. Adjust to zero lash, tighten the nut an extra 1/2 turn, then screw in the set screw. The way you described kinda sounds like you may not be getting a full 1/4 or 1/2 turn. They should be able to take 3/4 of a turn but not require it. If the lifters are going south, the extra 3/4 of a turn will make then collapse and bottom out sooner and probably more noisy.

The car was fully resto'd in 05 and finished in 07 so if they were bought new, they would have under 2500 mi on them. But according to what you're saying, tighten it the extra turn then just bottom out the set screw?

I actually do think that some of them were springy after i set the lash on them. I thought that had to do with the engine being cold and the hydraulic lifters not being pumped up?

 

[modo]

stupid question but are you sure they are hydraulic lifters?

 

[ryclef331]

You can take the lifters that you suspect are bad out, plan them in oil, and push the plunger in and out with a screw driver. They should get harder after a few pumps and them pretty much impossible. If they don't pump up, then they're definetly shot.

 

[Addermk2]

Ive got another stupid question for you...

He doesnt happen to be running a trickflow intake on the engine... is he?

 

[det_riot]

Nope, profeessioonal products typhoon. He knows its robbing power but the p/o cheaped out on the intake. Its a hydrualic roller cam so they should be hydraulix lifters aswell. He told me last night his mechanic buddyh came over and they redid them as they were on the compression stroke and that cleared it up so I guess he figured it out.