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Tractor Pulling Discussion Forum

Cubes from a 77 Oliver

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Keith

04-13-2004 02:34:26




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I am hoping to build a puller for next year and needed some adivce. I would like to get about 300 cubic inches form this tractor but I am not sure of the most cost effective way to do it. I see that there is a 3 9/16 overbore kit available but I would have to have a 5 inch stroke to get 300. I am not sure if that would fit in the block or how expensive that would be. I see some discussion about a 310 in 77s and 88s. Is this an engine that will bolt up to the 77? Any advice is appreciated.

Thanks,
Keith

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stroker

04-13-2004 17:51:26




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 Re: Cubes from a 77 Oliver in reply to Keith, 04-13-2004 02:34:26  
it depends on what you are allowed to run on rpm's, how big you can go. i've had 77's out to 460 cu.in.+ it gets real crowded and very expensive. staying on the conservitive side i would suggest offset grind a large journal crank to small journal size and use small journal rods.gets you 4 1/4" stroke. bore the block for 88 sleeves and bore them to 4" gets you just over 300 cu.in. this is about the most practical way i've found.

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Keith

04-13-2004 18:33:38




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 Re: Re: Cubes from a 77 Oliver in reply to stroker, 04-13-2004 17:51:26  
It looks like I could take a crank from a super 77 with 2.250 crankpin journals and a 3 3/4 stroke, offset grind it to 1.9995, which would fit a stock 77 rod and this would give me a stroke of 4 inches. If a crank from an 88 would fit, you could get more than that but do you know if it will bolt up? Is my math correct?

Thanks,
Keith



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Keith

04-13-2004 18:20:12




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 Re: Re: Cubes from a 77 Oliver in reply to stroker, 04-13-2004 17:51:26  
I like your suggestions here. I can run up to 10 percent over stock RPMs for the 3 MPH class or 30 percent over for 5.5 MPH class. I see that there is a 3 3/4 overbore kit on YT for an 88. Are you talking about boring the 77 block, putting in the 3 3/4 id sleeves from an 88 and boring the sleeves to 4 inches id? If so, what pistons, rods and crank could I use. This sound like it could be fairly affordable, although I do not know how much it costs to get a crank offset ground.

Thanks,
Keith

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Brad

04-13-2004 19:50:31




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 Re: Re: Re: Cubes from a 77 Oliver in reply to Keith, 04-13-2004 18:20:12  
I have built several 77 engines using this economical yet suprisingly lively combination.
super crank, farmall c rods, offset grind to make 4.25 stroke and a excellent rod ratio. 4.040 bore KB true flattop pistons, hone farmall wristpin bushings .007 and the pins fit great. makes a perfect .030 quench area with a .060 gasket. 1.5 & 1.375 valves and good headwork. NOT big ports, good ports. cut down a 88 intake to fit the 77. good camshaft, makes about 330 cid. very reliable combination that works well.

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Brad

04-13-2004 19:52:16




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 Re: Re: Re: Re: Cubes from a 77 Oliver in reply to Brad, 04-13-2004 19:50:31  
Forgot to mention, use aftermarket 88 3.875 sleeves, they have a .125 bigger OD than all of the oem oliver sleeves.



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770

04-13-2004 13:32:20




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 Re: Cubes from a 77 Oliver in reply to Keith, 04-13-2004 02:34:26  
I have 3-3/4 " overbore in my 77 with stock stroke and that gets me 248 cu in.



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