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Quick Valve Adjustment Question ?

Posted By: Classof70Chally

Quick Valve Adjustment Question ? - 02/18/09 10:32 PM

OK, I've got my pushrods and Hughes Billet hold downs . Now I just need to confirm some clearances. A short time ago a thread was talking about side clearance on the rockers. I now have .025" total between each set of hold downs. Also for hyd roller lifters with a streetcam/motor is .020" to .030" pre-load still good? Thanks for a quick reply as I'm trying to get this done today.
Posted By: MR_P_BODY

Re: Quick Valve Adjustment Question ? - 02/18/09 10:37 PM

Quote:

OK, I've got my pushrods and Hughes Billet hold downs . Now I just need to confirm some clearances. A short time ago a thread was talking about side clearance on the rockers. I now have .025" total between each set of hold downs. Also for hyd roller lifters with a streetcam/motor is .020" to .030" still good? Thanks for a quick reply as I'm trying to get this done today.



Thats fine
Posted By: Classof70Chally

Re: Quick Valve Adjustment Question ? - 02/19/09 04:20 AM

Well, I got the hold downs "adjusted" by way of a belt sander, it took a while but turned out pretty good for my first time doing this. I got the pushrods installed and it looks like I sized them just about perfect. With .025" of preload (which BTW is exactly 1/2 turn on the Comp SS Magnums) I have one (1) thread showing below the rocker arm bottom. The motor should be ready to install the first part of next week and fire up a few days after that!
Posted By: MR_P_BODY

Re: Quick Valve Adjustment Question ? - 02/19/09 04:58 AM

Quote:

Well, I got the hold downs "adjusted" by way of a belt sander, it took a while but turned out pretty good for my first time doing this. I got the pushrods installed and it looks like I sized them just about perfect. With .025" of preload (which BTW is exactly 1/2 turn on the Comp SS Magnums) I have one (1) thread showing below the rocker arm bottom. The motor should be ready to install the first part of next week and fire up a few days after that!



Sounds like you have it pretty well set up, I usually
give it a little more pre-load than .025 but if that
works for the lifters then thats fine( I usually go
1/2 to 3/4 turn)
Posted By: Classof70Chally

Re: Quick Valve Adjustment Question ? - 02/19/09 03:49 PM

Thanks for the input. The lifters didn't list any specs for preload. I can give them another 1/4 turn (3/4 total) which would bring the preload to .035" to .040" . Would this be better, I don't want anymore valve clatter than is necessary.
Posted By: MR_P_BODY

Re: Quick Valve Adjustment Question ? - 02/19/09 03:54 PM

Quote:

Thanks for the input. The lifters didn't list any specs for preload. I can give them another 1/4 turn (3/4 total) which would bring the preload to .035" to .040" . Would this be better, I don't want anymore valve clatter than is necessary.



Try it where you have it set now.... you shouldnt have
any clatter on a hyd
Posted By: Classof70Chally

Re: Quick Valve Adjustment Question ? - 02/19/09 03:59 PM

OK, Thanks. Actually when I did the adjustments I went just a bit past 1/2 turn so I'm probably closer to .030 than I am to .025. I'll leave it as is for now.
Posted By: DRAGSLICK

Re: Quick Valve Adjustment Question ? - 02/19/09 07:06 PM

What is the part number on your lifters?
Posted By: Classof70Chally

Re: Quick Valve Adjustment Question ? - 02/19/09 07:42 PM

Quote:

What is the part number on your lifters?

They are Compcams # cc8921-16. They are the retro-fit hydraulic rollers.
Posted By: DRAGSLICK

Re: Quick Valve Adjustment Question ? - 02/20/09 12:35 AM

Most pro-magnum lifters I have used call for .002 to .004 lifter preload with the engine warm. If you dont have instructions with your lifters you should call comp-cams and check. If they call for .002 to .004 preload and you have them at .025 to .030 your valves will not close all the way.

Attached picture 5038109-440lifters.jpg
Posted By: DRAGSLICK

Re: Quick Valve Adjustment Question ? - 02/20/09 12:44 AM

Open my attachment and see if the page from the catalog is big enough to read.
Posted By: Classof70Chally

Re: Quick Valve Adjustment Question ? - 02/20/09 03:35 AM

OK, I just accessed the comp catalog lifter section. For their Hi-Tech series of hyd lifters they recommend a preload of .030 to .060, for their Race series of hyd lifters they recommend a preload range of .000 to .030. For their retro hyd roller lifters which I have, they don't make a recommendation . I'll check with their tech line tomorrow. Has anyone else actually used these guys yet or have some info on what the preload on these should be?
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