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head swap ??????

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Old 03-15-2008, 02:21 PM
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Default head swap ??????

I just finished up my head swap and car seems to be running okay. I went from 241s to ported 317 to go with my sts. Before I used to pull 20" vacuum now im pulling 18.5" vacuum, there doesn't seem to be any leaks. I also have not hooked the y pipe up yet. IS a small drop in idle vacuum normal?
Also I was going to reuse my 918 springs off the 241 heads but three of them where broken. ONe intake and one exhaust on 1 head and one exhaust on another head. They broke right under the reatainer, is that where the problem ones where breaking?

I'm running the stock 317 heads on my 02 zo6 cam for now, Wil think of some duals in the near future.

Last edited by 2002ws-6; 03-16-2008 at 02:33 PM. Reason: add picture
Old 03-15-2008, 05:31 PM
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Also noticed with a small amount of throttle I pull a few more inces of vacuum be for it lessens. Doesn't that sound like a small leak somewhere?
Old 03-16-2008, 02:43 PM
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just added a pic of the springs. Why 5 of 16? Atr these from the bad batch?
Old 03-16-2008, 05:17 PM
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Damn it was still runnung ok with 5 broken springs?
Old 03-16-2008, 05:33 PM
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Ran fine till 5500 rpm then it felt a little weak.




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