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Ub with big engine parts


 
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FordNMan
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Joined: 12 Feb 2018
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PostPosted: Sat Nov 30, 2019 6:06 pm    Post subject: Ub with big engine parts Reply to specific post Reply with quote

Thinking about making my ub into a puller and need some answers. I ve heard of people using a g crank with stock rods and m5 jugs. Now an m5 336 had a 5 in stroke and a g 403 had 6 in stroke so how does a 6 in crank work in a shorter m5 block or what mods have to be made to make the 283 maincase, 403 crank, 283 rods, and 4.81" bored out 336 jugs work
 
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ChrisQ
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Joined: 05 Nov 2012
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Location: Jordan, MN

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PostPosted: Sat Nov 30, 2019 8:25 pm    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

4.81 pistons have the pin raised higher, thus basically making the piston shorter and sit lower, which keeps it from crashing into the head at TDC, and makes the extra 1"of stroke all happen at the bottom of the bore so to speak.
 
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DPittman
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PostPosted: Sun Dec 01, 2019 4:09 am    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

So after all that is said and done, how many cubic inches do we wind up with?
 
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FordNMan
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PostPosted: Sun Dec 01, 2019 5:21 am    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

So does the piston come out of the cylinder a little bit at the bottom of the stroke or are the skirts made shorter
 
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mmfan55
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PostPosted: Sun Dec 01, 2019 7:15 am    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

4.81 bore, offset ground 403 crank to use 283 rods, end up with around 466ci. Pistons must have the wrist pin closer to piston top. Some of the custom pistons out there.
 
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DownNDirty
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PostPosted: Wed Dec 04, 2019 8:11 am    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

I have this combo in my tractor. Ends up a 447.5 The stroke with offset grind to use the U rods is 6.160.
 
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FordNMan
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PostPosted: Wed Dec 04, 2019 9:12 am    Post subject: Re: Ub with big engine parts Reply to specific post Reply with quote

would it be beneficial to use a performance g cam or will a performance ub cam be just as good
 
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