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Tractor Pulling Discussion Forum

48 B block

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jrg3193

02-20-2006 08:00:29

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I would like to go from 4.69 bore to 5.125 block casting no.2500R is this practial? also want increase stroke from 5.5 to 7.5 using offset grind crank 2.56 journals for Oliver rods.

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jd b puller

02-21-2006 16:05:18

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Re: 48 B block in reply to jrg3193, 02-20-2006 08:00:29

1. Can't get to 5.125 without sleeving.
2. Can't get to 7.5" stroke without welding crank.
3. What motor Oliver has the 2.56 journals?

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DSK

02-20-2006 20:04:51

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Re: 48 B block in reply to jrg3193, 02-20-2006 08:00:29

There's a 5-2 Powerblock on E-bay right now. I believe the 5-2 is the block for the late B's. Pistons included. This would be a good way to go if you want to pay what these things are bringing these days. I watched a 6-1 {early A] go for a grand this past weekend. The item # for the 5-2 is 7592469490. Happy bidding.

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Drew

02-20-2006 17:48:20

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Re: 48 B block in reply to jrg3193, 02-20-2006 08:00:29

If you want to spend a bunch of $$, you can get your block cut out and sleeves welded in it. If you go that route, you dont stop at 5.125". 5.500" shouldnt be a problem, and I think you can do 5.750". A cheaper, however probably more difficult solution would be to find a power block. Good luck!!

Welding and stroking a crank to 7.500" shouldnt be a problem.

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