Somthing went on the topend!! - Page 2

manyfire · #11 11-05-2009, 02:12 PM

pulled the valve covers off, everything is moving fine, nothing is loose, if you can get past the exhaust squeek here is a video, when the motor started running rough it loosened the pipe by the tranny crossmember(ubolt for quick disassembly) the sound is comming from6/8 area, only when you put the throttle back some, havnt compression test yet, not going to get to it today, kinda hard to hear on the video, clost to end
http://www.youtube.com/watch?v=IqAaOn1Dkn8

manyfire · #12 11-05-2009, 02:14 PM

thinking 6/8 headgasket, didnt realize the mic on the camera couldnt take the noise

Scotty_S-15 · #13 11-05-2009, 05:01 PM

First thing I'd do was put the valve cover back on the driver's side..... so as not to make a friggin' mess. One side at a time.

But sometimes something amiss in the valvetrain is hard to see. I'd let it cool down. Then start it up, and keep a finger on one rocker at a time in the vicinity of 6 & 8, you might "feel" that clack. Yeah, definitely a loud clack.

Good Luck with that.... might be something easily remedied........
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manyfire · #14 11-05-2009, 05:21 PM

my neighbor came out and asked if they should call the fire dept, lol, I usually only do one at a time, was just having a hard time determining where it was comming from. got tired of pulling and putting them back on, got irritating, never got the chance to do the compression test today. What would cause that clack, a bad lifter? none of the push rods are bent, they are all spinning during operation, the valves are adjusted right, I ensured that today and all of them responded to being tightened(engine bog), kinda stumped, its going to stay parked until I get it figured out.

badtoad · #15 11-05-2009, 07:05 PM

Take a close look at the valve springs . Ive hade the same symptoms on my x drag car and found a broaken spring , took a while just to see it but when i did i was like how in the hell .

manyfire · #16 11-05-2009, 11:17 PM

providing the head gasket is not blown a valve is not bent, then I would just buy new heads, I am looking at this kit, if I have a bad spring, I will just replace them all, this kit will give me a new cam, springs, valve seals, retainers, and lifters.
http://cgi.ebay.com/ebaymotors/COMP-...Q5fAccessories

adh383 · #17 11-06-2009, 07:34 AM

Along with a possible head gasket blown-- that knock in your video sounds like piston issues-cracked piston , wristpin---etc. good luck

85SS · #18 11-06-2009, 08:08 AM

Doesnt sound good whatever it is. I had a similar problem once. Had a 355 slightly built and it started to knock kinda like that. I thought the same as you that I was maybe a spring, lifter, head gasket, or something else in that area. After about a week of looking and testing things we decided to pull it out and check the bottom end. Once we got it out and was getting it ready to put on the stand we found the problem. FLEX PLATE! Had a crack from one of the bigger holes all the way to the center.
Good luck with it Many. You will get it fixed.

badtoad · #19 11-06-2009, 08:25 AM

Sadly if you cant see the problem then a tear down is necessary . Been there done that = sucks .

355V8S10Tahoe · #20 11-06-2009, 11:05 AM

Wow! What a horrible sounding video, it's like the death of a close friend to me, sorry to hear of the problem your having many... I hate to say it but I have to agree with badtoad... If it were me I would have also never driven it 8 miles back home nor rev it up like that in a video, it can only make it worse... I would just pull the heads and see what's going on in there if you can't see it in the upper valve train components, you could have slight contact between a piston and two valves in the overlap stroke indicating a spun rod bearing but I don't think that would have lasted for 8 miles back home and a video if that was it...

Good luck Many, hope you find it's not that bad and an easy fix...