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Ub with big engine parts

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11-30-2019 18:06:00

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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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12-04-2019 09:12:51

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 Re: Ub with big engine parts in reply to FordNMan, 11-30-2019 18:06:00  
would it be beneficial to use a performance g cam or will a performance ub cam be just as good

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12-01-2019 05:21:56

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 Re: Ub with big engine parts in reply to FordNMan, 11-30-2019 18:06:00  
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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11-30-2019 20:25:57

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 Re: Ub with big engine parts in reply to FordNMan, 11-30-2019 18:06:00  
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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12-01-2019 04:09:58

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 Re: Ub with big engine parts in reply to ChrisQ, 11-30-2019 20:25:57  
So after all that is said and done, how many cubic inches do we wind up with?

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12-01-2019 07:15:26

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 Re: Ub with big engine parts in reply to Dpittman, 12-01-2019 04:09:58  
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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12-04-2019 08:11:36

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 Re: Ub with big engine parts in reply to mmfan55, 12-01-2019 07:15:26  
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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