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


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Old 06-05-2005, 10:22 PM   #1
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Default The time has come... Do GN valves work?

Heads are going to the machine shop ASAP. They came off today. What are good valve springs? I'm gonna be running YT rollers on 93 heads. Should I reuse my pushrods, or get new ones? Is there a good way to test for bent ones, other than rolling them? How about new valves?
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Old 06-05-2005, 10:31 PM   #2
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I'd go with new valves. You could put the pushrods on a lathe and spin'em up. I'd go with Comp Cams springs.
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Old 06-05-2005, 11:16 PM   #3
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What springs? Got a number?
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Old 06-05-2005, 11:51 PM   #4
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Depends on what you're doing for cam and rockers. Stock is 100#. With stock rockers and cam, but a Jet chip like I have with the increased redline, 105 or 110 pound would help prevent valve float at the higher rpms. Maybe 105'* without the jet? Regardless, anything new will be better than tired old springs.
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Old 06-06-2005, 04:19 PM   #5
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Why not get some lightweight generic pushrods out of say summit?
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Old 06-06-2005, 07:37 PM   #6
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What are the specs I should know to do that?
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Old 06-06-2005, 08:55 PM   #7
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yeah, if you find out the length, zzp has a few different lengths around 7.05".
I'm kinda thinking the series 1 pushrods might be longer though because of the taller deck height?
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Old 06-06-2005, 10:03 PM   #8
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Quote:
Originally Posted by 95naSTA
yeah, if you find out the length, zzp has a few different lengths around 7.05".
I'm kinda thinking the series 1 pushrods might be longer though because of the taller deck height?
Yes. They're like 8-9".
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Old 06-06-2005, 11:06 PM   #9
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Yeah, Straitor'* figures sound better. I never actually got to measuring mine, but I know they were significantly longer than my micrometer could measure [6.5"]. For sure longer than 7"


-justin
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Old 06-07-2005, 01:13 AM   #10
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Is length the only thing I need to worry about? How about oil passage?
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