The time has come... Do GN valves work? - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-11-2005, 11:29 PM   #31
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How am I supposed to know what that length would be?
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Old 08-11-2005, 11:32 PM   #32
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Quote:
Originally Posted by jwikoff99
How am I supposed to know what that length would be?
You, or someone else, would need to dig up the geometry specs, figure out how much lift you can get away with without any piston/valve problems, etc, this will be compounded by the slightly different heads you're switching to (maybe 93ish specs would be what u need?)

It'* not easy... But You don't necessarily *need* stock sized ones if you think about it. If you're gonna dig..
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Old 08-11-2005, 11:47 PM   #33
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If I have the heads milled, they will be effectivly longer. I've decided they are close enough to 8.00 inches to be considered the stock length and 5/16" tube diameter. Now, how about rods that are .050" longer, would that take up some lash?

Hmm...
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Old 08-12-2005, 01:15 AM   #34
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I'm pretty sure that stock lifters can only adjust .012-.020" difference in vavletrain geometry on the pushrod side. And aftermarket lifters are less forgiving too(Comp are at least).
You could buy spacers to put under your rockers to make up for the pushrod length difference though. I know of one guy that did that on a L36 setup.
And i think you getting yella terra full roller rockers too right? So you won't have the stock rocker tip contact the top of the valve on more of an angle. The roller will be there instead.
I dunno maybe call up some companies after you get some calipers on your stock rods?
seems like the safest way to go.
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Old 08-12-2005, 04:05 PM   #35
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So maybe I should put a head back on the 93, with the stock pushrods and a few of my YT rockers? That way I would know if I need a different length.

Sound like a good idea?
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Old 08-12-2005, 07:23 PM   #36
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Quote:
Originally Posted by jwikoff99
So maybe I should put a head back on the 93, with the stock pushrods and a few of my YT rockers? That way I would know if I need a different length.

Sound like a good idea?
I'm in the process of taking my engine apart and when i unscrewed the rocker arm bolts, the pushrods lifted up considerablly. I'm guessing it was the load being taken off the lifters?
So, if you just put the pushrods & rockers in to check i don't think it will be close enough to tell.
Try to take some calipers to your pr'*.
Your an engineer right? You have to have access to some calipers right? j/k

And as for the GN pushrods working, jeffery said they were a direct fit when he did his heads. But he had another retainer and spring combo though. (SBC) I was just reading that post a couple days ago when searching for info for your pushrod lengths.
Hope that helps.
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Old 08-12-2005, 08:15 PM   #37
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Quote:
And as for the GN pushrods working,
You mean valves?

If I actally reinstalled the head and valve train, I wouldn't be able to tell if the rods are the right length?
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Old 08-13-2005, 01:13 PM   #38
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Would 135# springs be over kill with a stock cam?
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Old 08-13-2005, 01:22 PM   #39
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I am in the process of taking apart a set of 1995 heads. I will compare the Series 1 OEM valves against a set of Manley GN valves I have in the shop and let you know. I will also take some pics for comparison, however I would need someone to post the pics for me.
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Old 08-13-2005, 01:27 PM   #40
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If you send them to me, I can put them on my cardomain site...

Is this gonna be soon? A day? A week? I'm ordering parts right now...
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