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Big bore John Deere A

It will run for a long time if the cranks built & installed properly. When you will actually receive the parts is the real question to ask.
 
It's not a question of if it will fail but when. Depends on the stroke you want to put in it, some welded cranks last for years, others not so long. We sell billet cranks. I have probably over 1500 hooks on the one in my G. You won't get that out of a welded one. Again, depending on the stroke, we probably have one on the shelve ready to ship out if your in a hurry.
 
Block or crank? Im in need of a block some time soon, just dont know how big of a bore I can safely put in front of my crank and get a few good years out of it.
 
We make both. The A blocks are 7 inch. The G ones are 7 3/4, and 8 inch. They all require our own designed head and manifold to fit those blocks. We also make 7 inch G blocks that will work with a stock or Murphy's head. Lead time on the blocks and heads is out there. The cranks we make are for A's G's, 70's and B's. They come in different strokes and pin sizes but we generally recommend the bigger pin.The cranks are usually on hand. We also are doing Moline heads, blocks and cranks but they are not a stock item. We have one A running a 7inch block on a welded crank that hangs together pretty good. He is going to a billet one now though so he can get more stroke out of it. The other A's with 7 in. are running the billet ones. Not all billet ones are the same. There is one source that has been having breakage issue faster then with welded ones. So far ours have been holding up well.
 
The Crankshaft I'm using behind a 7 bore has a 3.25 crank journal, hopefully to help it live longer. We've typically been getting about 5 years out of a welded 9 crankshaft with a 3 crankpin before we see cracks/wobble from the flywheel.
 
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