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Old 03-30-2014, 09:19 PM   #1
04blk40th
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Default Can swapping gone wrong?!

Hey guys I recently swapped my stock cams with hi-tech stage two's in my gt. Hi tech claims I don't need to degree and won't have ptv issues. Well let's just say I did the swap started the car and my stomach dropped. Sounded like a horse walking on pavement. So I tore it all a part and found my cam chain tensioner weak on passenger side. So I did the update to iron bodied. Threw it back together and started her. The pinging wasn't as bad but still there and noticeable. Now remember the timing is exact, tensioners and fluids are all new and everything is torqued properly. Any suggestions or have you been or heard of anyone down this path before? Anything is helpful thanks guys!
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Old 03-30-2014, 11:11 PM   #2
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Lash adjuster or followers out of place?? Too much lift for stock springs?? Hard to diagnose from a post
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Old 03-31-2014, 07:39 AM   #3
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Just because they claim it won't have PTV issues doesn't mean it couldn't happen....what specs did you use to time it? Hopefully you didn't wipe everything out on that first start up.

Like Erik said its tough to tell from a post, pull the valve covers off and take a video of it running and post up, try to narrow down exactly where the noise is coming from.
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Old 03-31-2014, 02:33 PM   #4
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Sound is directed torwards the valve covers almost sounds like rockers hitting valve covers but obvs it can't because cam sits ontop. Timing is not advanced or retarded it's timed exact as how I pulled it apart. Everything was lined up. Car starts and runs perfect besides the ping. Which leads my to think it's not PTV
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Old 03-31-2014, 02:34 PM   #5
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Also motor hasn't been beat well taken care of since day one and has 48kmiles
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Old 03-31-2014, 07:03 PM   #6
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Take the valve covers off and re check everything
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Old 03-31-2014, 07:33 PM   #7
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Alright guys took my buddy's inspection camera and pulled the plugs. The valve just kissed the piston nothing serious just a tiny tiny mark. Looks like my timing needs to be changed anyone interested in doing a side job will have motor all apart in my garage beers included. I tried reading a few write ups on timing but it's way out of my skills I'm local in hopkinton available nights and weekends
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Old 04-01-2014, 12:21 AM   #8
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I'd be worried about a bent valve. Also your problem may not be cam timing related. Could need notched pistons
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Old 04-02-2014, 03:19 PM   #9
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How many cylinders had markings on them?
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Old 04-03-2014, 08:51 AM   #10
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Only one it's barely kissed can see a tiny clean spot from where Carbon was scraped off
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Old 04-07-2014, 06:40 PM   #11
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I have heard of this happening with 2v motors and Hitech stage 2s. Hitech def says the cams don't need to be degreed, but that is just silly.
Any time the chains come off I TDC the crank and degree the cams.
I would do a leakdown test to check for a bent valve. If that is the case the head needs to come off to repair it.
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Old 05-20-2014, 09:13 AM   #12
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I swapped my stock cams back in and car runs perfect. I'm not at all worried about a bent valve. Cams are for sale if anyone is interested
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Old 05-21-2014, 10:52 AM   #13
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Good to hear you fixed it
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Old 05-21-2014, 11:13 AM   #14
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Glad to hear it was nothing serious. Did you see any "eyebrows" on the tops of your pistons? lol
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