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Old 03-14-2013, 05:10 AM
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Broken Carb Mounting Stud

I managed to tear down three engines and assemble this one just to break one of the carb mounting studs. The engine is cleaned, painted and ready to drop in but I wanted to remove the studs to bolt on the engine plate with grade 8 bolts. I should have used heat but I had the intake blasted and cleared.

It snapped just below the carb mounting surface. I tried at least 5 times to weld on a washer and bolt. I gave up and started drilling. I went through 10 bits and still could not drill it out. Granted, 6 were cheap ones from harbor freight and the others were lew end dewalt.


I am going to stop at sears today and try to find something better. Should I use cobalt? Left hand thread?

It is an aluminum intake. Should I be inserting a coil or should I just tap the new hole? The hole I am drilling looks to be centered but I dont know that it will end up that way.

Any other suggestion?
I did start looking on craigslist for another intake!

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Old 03-14-2013, 05:15 AM
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Originally Posted by kaw550 View Post
I managed to tear down three engines and assemble this one just to break one of the carb mounting studs. The engine is cleaned, painted and ready to drop in but I wanted to remove the studs to bolt on the engine plate with grade 8 bolts. I should have used heat but I had the intake blasted and cleared.

It snapped just below the carb mounting surface. I tried at least 5 times to weld on a washer and bolt. I gave up and started drilling. I went through 10 bits and still could not drill it out. Granted, 6 were cheap ones from harbor freight and the others were lew end dewalt.


I am going to stop at sears today and try to find something better. Should I use cobalt? Left hand thread?

It is an aluminum intake. Should I be inserting a coil or should I just tap the new hole? The hole I am drilling looks to be centered but I dont know that it will end up that way.

Any other suggestion?
I did start looking on craigslist for another intake!
If the stud was broken because it was seized or overtightened into the manifold, it can be a real chore to remove.

PB Blaster will definitely help w/getting penetrant into the threads. Other tips and ideas are here.

Good luck.
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Old 03-14-2013, 08:04 AM
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another reason.

I will never use one of those carb mount lift plates and NEVER would use one on an aluminum manifold. I have the adjustable lift bar with 4 chains to the head bolts and can easily turn the crank to adjust tilt.
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Old 03-14-2013, 06:22 PM
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I was able to finish drilling out the bolt with cobalt bits from sears. I tried an extractor but it wouldn't remove it. I ended up tapping the hole and was able to insert a stud. The angle is a little off. It is straight up and down while the other three angle forward.

I can slip the carb over the other three then bolt in the stud in the hole I threaded. It is not perfect but it should be more than enough to hold down a carb.
Any potential issues I am overlooking?

Now I wont be be using the engine plate to lift the engine. I will have to pick up one of the levelers. Just got the plate from summit in the mail today.
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Old 03-14-2013, 06:27 PM
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To lift it just but a bolt in the front of one head and one in the rear of the other head, attach the chain, and just adjust the chain of the hoist's hook to get it level. You really need the leveler
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Old 03-15-2013, 03:58 AM
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My 70's vintage 350 had lifting eyes bolted to the front driver's side and rear passenger side intake manifold bolts, and they appear to be from the factory. They made it real easy to pick up the engine with a cherry picker and leveler, so I left them in place until later when I swapped manifolds. If they are a factory item, there may be a lot of engines in the junkyard where you could pick them up for a few bucks.

Bruce
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Old 03-15-2013, 01:27 PM
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Originally Posted by 75gmck25 View Post
My 70's vintage 350 had lifting eyes bolted to the front driver's side and rear passenger side intake manifold bolts, and they appear to be from the factory. They made it real easy to pick up the engine with a cherry picker and leveler, so I left them in place until later when I swapped manifolds. If they are a factory item, there may be a lot of engines in the junkyard where you could pick them up for a few bucks.

Bruce
I had those in my car too. Gm must use some small hooks to lift the engines cause i couldn't fit anything i had through them
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