Posted by Seth Boyer on January 15, 2015 at 18:22:04 from (174.125.72.3):
In Reply to: C123 build posted by Cliffton D on January 15, 2015 at 10:42:46:
Over the past few years I've been rebuilding an F-12. I realize overall engine design is different than your C. The F-12 still has a C113 stock motor.
I used SC 3 1/4" overbore kit with step head pistons. I'm not familiar with what it takes using that kit in C. To fit them in the F-12 block required machine work on the sleeves and block both.
From the obvious increase in cubic inches I also spent many hours porting and polishing the head and manifold. The Heisler manifold I'm using is a huge improvement from either of the stock manifolds. If I hadn't been given new valves for free and already had new valve guides I would have liked to look into seeing about changes valve sizes. Every little bit to help it breath more.
I sent my cam off to Berry cam explained what I was planning to do with the tractor. I wanted maximum HP increase. I'm not planning to pull with the tractor. Just driving in cruises, parades, may do some plowing. He did a mild build and I'm very happy with the results.
I'm still experimenting with carbs. I've been told to open up the Venturi. I have plenty of parts carbs on the shelf.
I'm by no means an expert. This was only the second complete engine rebuild I've ever done. I've spent many hours researching books and online. It's your tractor. Your money. Decide what your goal is to do with the tractor and save up for whatever it takes to make it happen.
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