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Old 05-17-2008, 01:52 PM
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starter and block question Chevy

Hey Guys,

I got a big problem with a 400 sbc thats in my 55 chevy,,, I have been having starter problem with it for awhile now, and i just figured out why,,

I have a crack in the outside bolt hole,, Its not broke off yet but its cracked on both sides of the hole and split the threads..

The motor is brand new from the shop with less then 4 miles on it,, i had over $800 worth of work done to it so i really dont want to just throw it away and start over..

My question is what would be the best thing to do with it,, HAVE THE CRACKED FIXED? or i know for a 265-350 sbc they make a plate that goes behind the block and it use's a different flywheel and a 3 straight bolt starter like a ford, Butt i dont know if i can get that for a 400 ext balanced motor?

thanks for any idea's

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Old 05-17-2008, 02:21 PM
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bolt hole.......

HI,why not drill out the hole,and install a heli-coil,im not sure if it would work,but,i think its worth a try.
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Old 05-17-2008, 02:28 PM
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Quote:
Originally Posted by tiresmoke55
Hey Guys,

I got a big problem with a 400 sbc thats in my 55 chevy,,, I have been having starter problem with it for awhile now, and i just figured out why,,

I have a crack in the outside bolt hole,, Its not broke off yet but its cracked on both sides of the hole and split the threads..

The motor is brand new from the shop with less then 4 miles on it,, i had over $800 worth of work done to it so i really dont want to just throw it away and start over..

My question is what would be the best thing to do with it,, HAVE THE CRACKED FIXED? or i know for a 265-350 sbc they make a plate that goes behind the block and it use's a different flywheel and a 3 straight bolt starter like a ford, Butt i dont know if i can get that for a 400 ext balanced motor?

thanks for any idea's
With it being cracked there is nothing you can do to fix it right. Contact the shop and explain your problem, maybe they can be of some help.
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Old 05-17-2008, 02:46 PM
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i would heli-coil and use a stud if you can get the starter on with the stud. and make sure you use the front starter brace for support.

sam-missle
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Old 05-17-2008, 04:12 PM
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I can't remember the name of them right now, but I actually prefer the "other" helicoil. Is the word I'm looking for "threadsert?" I forget.

Anyway, a helicoil is strong, but it still relies on threads. What I suggest is maybe drilling the ends of the cracks with a 1/6" bit to prevent it from continuing. Then you can drill out the hole, machine the top of the hole with a countersunk shoulder, then press in a new threaded sleeve. That way (provided the cracked piece doesn't fall off entirely) you have a positively-located press-fit sleeve. The stress is no longer placed on the cracked hole, but rather on a new sleeve that is simply held in place by the surrounding block material.
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Old 05-17-2008, 04:29 PM
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Here is what I'm talking about in the image attachement. Its not perfect, but it seems like a viable alternative.

Or, for that matter, you could machine a flat pad at the top of the hole, drill out the threads, and use a long through bolt. As long as the integrity of the "ear" on the block is strong, all you need to do is remove the stress from the threads.
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Old 05-17-2008, 04:41 PM
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starter problems.

Once again, the broken Chevrolet V-8 starter/block boss. Short of having it welded by someone that really knows cast iron welding there's not a whole lot you can do to repair it PERMANENTLY. The block plate for the early 265, available from most of the classic vendors, ie. Danchuck, is really probably your best bet. The 400 flywheel/flexplate is a 168 tooth setup. The transmission/bellhousing starters used with the plate will only work with a 168 tooth unit so you're good there. That's what I'd do anyway.
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Old 05-19-2008, 05:42 PM
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Quote:
Originally Posted by sam-missle
i would heli-coil and use a stud if you can get the starter on with the stud. and make sure you use the front starter brace for support.

sam-missle

I went ahead and put the stud in the block and put a old brace in the back of the starter like you posted and so far so good, Knock on wood i started it a few times now and it dont seem to be getting any worst..


Thanks Ever one for there info, Great Help!!!!!!!
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