Straight Six Crack in Block - Vintage Mustang Forums
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post #1 of 12 (permalink) Old 09-16-2019, 03:45 PM Thread Starter
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Straight Six Crack in Block

Swapping out my head gasket and discovered this crack. It’s on the timing side on the bolt thread that goes down into the pump housing.

Am I in deep ****?
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post #2 of 12 (permalink) Old 09-16-2019, 04:21 PM
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Weld it up, re-tap it and you should be good(though welding cast iron is a PITA). The only other choice is to replace the block...viable option though since I6 engines are cheap and blocks are cheaper.
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post #3 of 12 (permalink) Old 09-17-2019, 07:44 AM
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post #4 of 12 (permalink) Old 09-17-2019, 10:19 AM
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If your going to have that welded have it professionally done since thatís where a head bolt goes so there will be stress there, it will need to hold 75 foot pounds without cracking again. Iíd look around for another block myself, if you canít find one go with the have it repaired option.

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post #5 of 12 (permalink) Old 09-17-2019, 10:37 AM
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You should add your location to your profile.

You never know, there could be somebody nearby who wants to get rid of an old 200 block who might be willing to dump it on your doorstep for cheap.
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post #6 of 12 (permalink) Old 09-17-2019, 10:58 AM
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Quote:
Originally Posted by Magnus View Post
You should add your location to your profile.

You never know, there could be somebody nearby who wants to get rid of an old 200 block who might be willing to dump it on your doorstep for cheap.
Exactly- you just might be close enough to a guy like me that has a complete freshly rebuilt 6 cyl engine, painted, and ready to drop in that I'm not going to use... $100 would take it in a heartbeat
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post #7 of 12 (permalink) Old 09-17-2019, 12:53 PM Thread Starter
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I’m in Maine. Can’t seem to find anything around here, but O just started the resto on the car, so I’ve got time.

What kind of results would I get if I just put JB Weld on it? What’s going to happen if I JB Weld, then rebuild and run? Worse case / best case?
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post #8 of 12 (permalink) Old 09-17-2019, 01:01 PM
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Quote:
Originally Posted by Luke Edward Krummel View Post
Iím in Maine. Canít seem to find anything around here, but O just started the resto on the car, so Iíve got time.

What kind of results would I get if I just put JB Weld on it? Whatís going to happen if I JB Weld, then rebuild and run? Worse case / best case?
JB weld wont hold the pressure from a head bolt...it also does not hold up well in hot, wet, or oily environments. Worst case scenario the head gasket blows immediately...best case scenario the headgasket blows later on. If I were you...I would take GT350sr up on his freshly rebuilt I6...a freight pallet shipment on that thing would be less than $200
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post #9 of 12 (permalink) Old 09-17-2019, 03:01 PM Thread Starter
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GTSR I’ve been trying to PM you. Interested in Frieghting that pig to 04496?

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post #10 of 12 (permalink) Old 09-17-2019, 07:33 PM
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I could probably get it crated and dropped off somewhere, so sure. I'll look into it and see what I can come up with. I'll get back to you...

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post #11 of 12 (permalink) Old 09-17-2019, 07:39 PM
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If that block were mine and it was original to the car, I would have it welded up locally. If it is not original to the car, I would find a junkyard block or compete engine. They are plentiful and cheap around here. Im sure if you look around where you live, you will find an engine or block for a song.

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post #12 of 12 (permalink) Old 09-17-2019, 07:41 PM
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Dump the Block... Find another one. The crack runs right above the Coolant passages.. No Good. It's toasted.

A Classic case of Over-tightening the Head...except this time, The block cracked instead of the head..

They must have tightened the head down over 110 foot pounds to cause a serious crack like that...


)

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