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Old 08-11-2012, 01:05 AM   #1
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Blowig out donuts

I have a 67 stang and I keep blowing out my exhaust donuts with in a few weeks. Anyone have any ideas why? I'm at a loss. ( I know if I get headers i won't have to deal w it but in due time )
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Old 08-14-2012, 04:23 AM   #2
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When you install them, are you tightening the bolts evenly or are you going all the way down on each one? Are you going start to stop on one bolt at a time? You may also want to look to see how much stress is put on that joint weight wise. Check to see if you may need to place a hanger closer to that donut joint to take some weight off it.

Maybe check to see if you're using the right temperature gasket as well. I have no idea if there are different temps available but, it's worth a shot.
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Old 08-14-2012, 05:13 AM   #3
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Thanks for the response. Im doin it correctly each bolt little by little I have had her for 6 years and never had an issue till recently. I'll check the hangers but I welded them pretty good and I got the best donuts I could..... Guess its time to switch to headers
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Old 08-14-2012, 05:19 AM   #4
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Quote:
Originally Posted by Sainte
When you install them, are tightening the bolt evenly or going all the way down on each one? Are you going start to stop on one bolt at a time? You may also want to look to see how much stress is put on that joint weight wise. Check to see if you may need to place a hanger loser to that donut joint to take some weight off it.

Maybe check to see if you're using the right temperature gasket as well. I have no idea if there are different temps available but, it's worth a shot.
Agree, sounds like an alignment, weight problem with the joint. Good advice
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Old 08-14-2012, 06:40 AM   #5
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Oh, another thought may be that the ring that the donut sits in is now corroded and allowing play inside the joint. It would only take a little bit of movement to wear the donut out over time.

Had to edit my pious post for spelling corrections, it's kinda tough to type on one of these tablets.
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Old 08-14-2012, 07:09 AM   #6
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Thanks and haha I jut suck at spelling period and half the time the smart phone makes me look dumb! Haha
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Old 08-14-2012, 07:27 AM   #7
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This is how my 65 289 started out.
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Old 08-14-2012, 07:42 AM   #8
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Looking good! How she run? Here's my baby
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Old 08-14-2012, 07:56 AM   #9
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Re: Blowig out donuts

It runs like a top! I dropped a T5 from a 94 Cobra in it......I am going to be purchasing a lot of tires I think......

I went with a 93 5.0 bellhousing and input shaft/bearing retainer to get proper clearance.


Your motor looks phenomenal! Did you run into any clearance issues with the higher sitting carb?
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Old 08-14-2012, 02:25 PM   #10
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Thanks I built it at school. No issues w the hoold

---------- Post added at 12:25 PM ---------- Previous post was at 12:24 PM ----------

Darn that wasn't suppose to send. No issues clearin the hood but I had use a hecka small air cleaner. I got a spacer an now have a bigger air cleaner but I have hardly no room between my air cleaner and hood
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Old 08-14-2012, 08:31 PM   #11
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Quote:
Originally Posted by Dadsgl67
Thanks I built it at school. No issues w the hoold

---------- Post added at 12:25 PM ---------- Previous post was at 12:24 PM ----------

Darn that wasn't suppose to send. No issues clearin the hood but I had use a hecka small air cleaner. I got a spacer an now have a bigger air cleaner but I have hardly no room between my air cleaner and hood
You might look into a scoop and a bigger spacer. It'll keep your air/fuel mixture cooler and it will breath easier.
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Old 08-14-2012, 11:14 PM   #12
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I'm gonna second checking he manifold and pipe joint. I had a Toyota in HS that would blow one about once a year. The manifold surface was scored from leaking and it would burn through at that spot from heat/pressure. Also I think I've also seen in the past possibly from engine mounts and exhaust hangers creating undo stress in the joint caused failure.
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Old 08-15-2012, 04:46 AM   #13
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Quote:
Originally Posted by Willi960

You might look into a scoop and a bigger spacer. It'll keep your air/fuel mixture cooler and it will breath easier.
I want to get a new hood but I gotta get her to a daily driver first. She's had a few hick ups but seems to be doing ok now.

---------- Post added at 02:45 AM ---------- Previous post was at 02:44 AM ----------

Looks like my pipe is out of round slightly so it seats Nicely but as it rattles and moves the slightest bit it screws up the donut

---------- Post added at 02:46 AM ---------- Previous post was at 02:45 AM ----------

Looks like my pipe is out of round slightly so it seats Nicely but as it rattles and moves the slightest bit it screws up the donut
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Old 08-15-2012, 10:18 AM   #14
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Re: Blowig out donuts

Awesome! Glad you found the problem.
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Old 08-16-2012, 03:36 AM   #15
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Thanks guys now does anyone know bout breaking rocker studs? I never had the problem before and now I broke 3 since 4th of July.
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Old 08-16-2012, 08:00 AM   #16
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Re: Blowig out donuts

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Originally Posted by Dadsgl67 View Post
Thanks guys now does anyone know bout breaking rocker studs? I never had the problem before and now I broke 3 since 4th of July.
Going out on a limb here but, are your rockers the correct length?

What about your valve stems?

Maybe even check the height of your cam lobes or lifter rods.

I could put one down to a cracked stud but, three is too much of a coincidence.
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Old 08-16-2012, 10:43 PM   #17
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I sent the studs out to be tested I think I may have gotten a bad batch the cam and heads and valves all work great together we we crunched the numbers and the spring tension is correct. So I'm at a loss
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