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Minneapolis Moline Tractors Discussion Forum
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403 in a 670 Super

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Chris Sublett

02-08-2008 06:02:11




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I am thinking about putting 403 blocks,pistons and crankshaft in my 670 Super. I need a little more HP and since I already have the parts this option would be cheaper than buying a bigger tractor. Does anyone have experiance with the parts swap and any problems I might run into?
Also how will the 4230 heads work on the longer stroke engine? Any advice will be greatly appreaciated. Thanks Chris

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MnM44

02-08-2008 18:24:09




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 Re: 403 in a 670 Super in reply to Chris Sublett, 02-08-2008 06:02:11  
The two biggest problems are with the crank. You will have to machine the rear crank flange to accept the pto drive of the 670. Then the front crank gear needs to be changed to a small nose 605 gear and a bushing made to fit the larger seal and pully of the 670. The 4230 heads will work fine late model HD 605s came with 4231s.



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