Projects Not good news in the Flathead

So got the engine onto a stand today to perform some investigating. Removed the intake and was super stoked to find nothing broken. When I took off the head I found the rust pop marks shown in the pics. Stoke bore and I’m hoping (fingers crossed) that the machine shop can cut .030 and make it good. Just wanted to update the group.


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If the bore is not badly worn, I would consider just a quick hone job and new rings.

 

Looking bad in the right bank too. Looks like some jack nut used JB weld to fill in a crack and then hone the cylinder. SMH.


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Post in “ what I dislike about the hobby” thread....just kidding, sorry this happened

 

What is the bore now,,,it should be able to handle the overbore,,surely.

Tommy

 

Welcome to the HAMB. I'm fairly new and just had a flathead done. That looks pretty good except for the area you think may have been epoxied. I doubt JB Woeld would have withstood combustion temps and pressures for very long. I just needed 0.020" to clean up mine after a rebuild overbore of 0.040". So I"m at 0.060" now.

 

My guess is that one is going to need a sleeve which is no big deal. You need to have it checked for cracks before you go to far on it.

 

Stock bore. 3.18


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Should clean up just fine,,,as long as that gouge is not too deep under the epoxy.
Either way,,they can be bored a lot.
Good luck man.

Tommy

 

Plenty of room for a cleanup bore.

 

Looks like a fair bit of pitting that won't be easily honed out:

 

I bet it was stuck at one time.

 

If you have to buy pistons anyway, I'd bore it to 3 5/16" for the extra displacement and compression. The pistons and rings cost the same and you'll still have enough meat in the cylinders for a couple of more rebores and a hone or three. Everybody wants the vaunted Merc crank which will give you 255 cubic inches with a bunch of money and effort, while boring 1/8" with a stock stroke will give you 258 cubic inches for about the same cost and effort as a stocker (239").

 

Good info here...!

 

that's gonna take a lot of overbore to clean up completely...I like tubman's suggestion

 

Thanks Tubman.

 

I would not worry about it.

It may have been silver solder. I have seen them done that way before. seems like it must have worked well enough.

I don't know much about your flatty, but I do know that most of them will go .125 and still have plenty of meat left. They were a heavy casting. If your machinist doesn't know what it will take to clean it up have him rough bore it 'til its clean then buy pistons to match and tail it in.

 

My 49 Flathead is .090 over and has one sleeve to repair a cracked cylinder from way back when. I replaced the rings and it runs like a top with very little oil use, at least by Flathead standards.

On a completely unrelated subject, I have a set of new .060 rings I’d let go very reasonably.

 

I think it can be bored to what you want. Sleeving could be an option.

 

Looks like SPEEDY from McDonald's.

 

That Epoxy Fix might not be EPOXY!!!!! It might be a COLD REPAIR done with LOCK-N-STITCH—-I repeat—-LOCK-N-STITCH—Google it and don’t FFF with it!!!!


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