broken bolt housing on 350 block for the starter - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-13-2007, 01:34 PM
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broken bolt housing on 350 block for the starter

i have a 1972 chevy pickup and i have a broken bolt houseing on the block where the starter mounts what are my options

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Old 07-13-2007, 01:53 PM
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First off, disconnect the battery. Spray lube in the hole, heat it with a propane torch, then use a small chisel and hammer to see if you can work the bolt a revolution to the left, if you can get it to move, spray more lube on it to cool it, then twirl up a rag and work it up in the hole, then twist out.
Or the next logical step would be a easy out for broken bolts that you can pick up at any parts store. Another trick you can use is the freeze technique as I call it, this where you use a can of freon attached to a freon gun for those that want to refill there car`s a/c at home, just twist the gun on, pull the trigger and blast the bolt, the freon coming out will be more than just cold, it`ll be da*ned cold, this will shrink the bolt and aid it coming loose.
What I`ve often did if the heat method didn`t work, was lube it, several times if needed, then hit it with the freon, then hit it with the easy out, I`ve had a pretty good success rate with it too.
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Old 07-13-2007, 02:10 PM
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the actual housing on the block broke off for one of the bolts
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Old 07-13-2007, 02:36 PM
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Ah okay, then the only fix I know is to have it welded and retapped, but this is very difficult, as few people can weld cast iron, if not then you`ll need another block. Maybe someone else on here know`s of a easier fix.
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Old 07-13-2007, 03:17 PM
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Doc here,

There is a product Called Aluminalloy, (they make rods for Cast also..) that you can weld two pieces of any metal (provided you buy the right rods) together, with a simple home propane torch...Grind and paint and it's supposed to stronger than before it broke..

Aluimalloy

How to weld anything

Never used the cast rods, BUT I can tell you the aluminum rods DO work as advertised..

The rods cost about $2 fazools apiece or $50 Fazools a pound..Might be worth a try before you have a welder try at $100 an hour..

Doc
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Old 07-13-2007, 03:27 PM
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Some of the blocks had 3 bolt holes but only use 2. Maybe you could just get a different starter and use the other hole.
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Old 07-13-2007, 04:04 PM
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If it's a standard, use the mid 60s truck bell that has the mounting for the starter. You will need the same year truck starter also.
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Old 07-13-2007, 05:00 PM
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broken starter mount/block.

This is a common occurance and has been addressed here many times. My answer, as most people can't weld, don't have access to a welder, want to avoid paying someone a bunch of money, or really want to save the engine is to get an "adapter plate". All the classic Chevrolet parts suppliers sell them ( ie: Danchuk ). They were originally made in order to use a late model automatic transmission on the early 265 blocks that did'nt have provisions for block mounted starters; they used bellhousing/transmission mounted starters. This plate goes between the engine and whatever transmission gets used. The only real drawback is that you have to use an old style bellhousing/transmission mounted starter. The plates are about $100.00 then you also have to buy a "new" old style starter. And don't forget to install the starter support bracket.
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Old 07-13-2007, 08:55 PM
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Doc here,

Also if you didn't break off too much of the casting, you might consider a High torque Mini starter, these usually have 4 bolt holes..you can drill and tap the next on in from the broken cast..

Just be sure it's (the starter) is straight , or forever be adjusting it..

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