Slant Six Forum :: Super 6 intake and exhaust manifold question

Cut the bolts, drill them out and use long bolts as replacements. Don't bother to tap the exhaust manifold. Use a low strength bolts. If you ever take it apart again, you can just break the bolts if they are corroded. Makes disassembly a breeze.

Now that I have the bolts out and the original threads are still in tact, would it be a fools errand to drill out the threads and use the low strength bolts at this point?

I question why they even threaded the exhaust manifold AND used nuts on the end??

Quote:

Now that I have the bolts out and the original threads are still in tact, would it be a fools errand to drill out the threads and use the low strength bolts at this point?

Yes. Use appropriate (high-strength) bolts that will withstand the thermal cycling.

Quote:

I question why they even threaded the exhaust manifold AND used nuts on the end??

The nuts were used to space the throttle/kickdown bracket appropriately from the manifold.

I would use grade-8, but grade-5 is probably good enough. I don't recall having much trouble getting them, but the last time I needed to was quite a few years ago.

Author:	shadango [ Sun Sep 25, 2016 9:15 am ]
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NOT SO FAST!!! WOOHOO! Decided to grab the end of the bolt that was sticking through with vice grips and keep heating and soaking with blaster/blu torch. Eventually -- MOVEMENT! Was a pain in the doopah but they both eventually came out.

Author:	shadango [ Sun Sep 25, 2016 9:17 am ]
Post subject:
Quote: Cut the bolts, drill them out and use long bolts as replacements. Don't bother to tap the exhaust manifold. Use a low strength bolts. If you ever take it apart again, you can just break the bolts if they are corroded. Makes disassembly a breeze. Now that I have the bolts out and the original threads are still in tact, would it be a fools errand to drill out the threads and use the low strength bolts at this point? I question why they even threaded the exhaust manifold AND used nuts on the end??

Author:	SlantSixDan [ Sun Sep 25, 2016 9:46 am ]
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Quote: Now that I have the bolts out and the original threads are still in tact, would it be a fools errand to drill out the threads and use the low strength bolts at this point? Yes. Use appropriate (high-strength) bolts that will withstand the thermal cycling, with anti-seize compound on the threads and brass nuts as needed. Disassembly in the (hopefully distant) future will be a cinch. Quote: I question why they even threaded the exhaust manifold AND used nuts on the end?? The nuts were used to space the throttle/kickdown bracket appropriately from the manifold.

Author:	shadango [ Sun Sep 25, 2016 9:54 am ]
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Quote: Quote: Now that I have the bolts out and the original threads are still in tact, would it be a fools errand to drill out the threads and use the low strength bolts at this point? Yes. Use appropriate (high-strength) bolts that will withstand the thermal cycling. Quote: I question why they even threaded the exhaust manifold AND used nuts on the end?? The nuts were used to space the throttle/kickdown bracket appropriately from the manifold. \ Ok so like a grade 8 then? Hoping these are common size/length bolts available at the hardware store! I am doing a dry run of the "new" to us 2 bbl manifold and the original exhaust manifold......and thinking (overthinking?).... We want to paint the exhaust and intake but I know that once the two are mated they should be surfaced together right? And not diassembled after that, correct? I hate to paint these and then have a shop manhandle to surface then and mess up the paint....but if we have them surfaced together and then we pull apart to paint them, we may have a bugger of a time re-mating them.....

Author:	shadango [ Mon Sep 26, 2016 11:24 am ]
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Anyone know the size and length these bolts bolts need to be? I meant to measure them so I can stop after work today and guess what I forgot to do...LOL

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Super 6 intake and exhaust manifold question https://slantsix.org/forum/viewtopic.php?t=60090	Page 2 of 2

Author:	shadango [ Tue Sep 27, 2016 8:02 am ]
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SO the bolts are 3.5" long 5/16"- 18 bolts. Someone in another thread said they are 4" long...but my originals are 3.5". (1980 slant 6) Cant locate any grade 5 or 8 bolts with enough thread so far...found a 4" long bolt that works, but not sure the basic steel will be tough enough? I assume trying to use a die and cut the threads longer on a grade 8 would be not very doable by hand.... SO I just ordered 5/16"18 grade 5 yellow zinc plated 3.5" bolts and nuts and washers from fastenall.....

Author:	SlantSixDan [ Tue Sep 27, 2016 10:16 am ]
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I would use grade-8, but grade-5 is probably good enough. I don't recall having much trouble getting them, but the last time I needed to was quite a few years ago.

Author:	shadango [ Tue Sep 27, 2016 12:11 pm ]
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Quote: I would use grade-8, but grade-5 is probably good enough. I don't recall having much trouble getting them, but the last time I needed to was quite a few years ago. Its the ALL THREAD that is the problem. But my local fastenall can get them for me.....hopefully will have them thursday.

Author:	imanexcellentdriver [ Sat Oct 08, 2016 10:08 pm ]
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If anyone cares, here's my cobbled together linkage I shot for u/gdizzle:

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