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Tractor Pulling Discussion Forum

Oliver 77 Stroker Motor - What To Run?

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Clark Weaver

12-30-2005 06:57:55




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I was hoping someone out there would be kind enough to share their experience and advice on building a basic Oliver 77 stroker motor. This is my first Oliver and I'd like to leverage others experience if anyone is willing to share it. I have a stock Super 77 motor that I would like to bore and stroke but am not sure what combinations people are running and what components they use (rods, pistons, etc.). Any help you can share would be much appreciated. Thanks in advance.

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Mike Bray

01-05-2006 19:09:10




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-30-2005 06:57:55  
I used a massy harris rod it clears alot better.Came from a 101 Jr. or alot of M.H. motors used this rod. I think the # was F400D



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stroker 88

12-30-2005 18:22:41




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-30-2005 06:57:55  
depends on how big you want to go. they are very time consuming. the ones we have done aren't the kind you hand someone a bunch of pieces and send them home. it takes alot of machine work and clearenceing.



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Clark Weaver

12-31-2005 06:15:00




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to stroker 88, 12-30-2005 18:22:41  
Agreed... I was thinking about keeping it fairly simple for my first Oliver considering I have been an IH person all my life. In any case, I was considering offset grinding to 2.00 journals and use the standard 77 rods then go to a 4" bore. We make our own rods when we have to so I can make that work with a small block chevy piston I would think. But, I have no idea what head gasket to run with that bore. Also, I'd really like to go to a much larger stroke - I am happy to do the clearancing but am not sure where to draw the line on the first motor. With the right rods and a little work, I would think a 4 1/2 stroke shouldn't be too much of a problem. Thoughts? I have a crank person that can do the stroking and a few lathes, mills and some CNC equipment in my shop that can be leveraged as needed. I just don't want to have to figure it out from scratch if I can avoid it. Thanks again for your input.

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stroker 88

12-31-2005 13:45:42




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-31-2005 06:15:00  
4 1/2" should be no problem. getting that from a 77 crank with out welding won't happen. i have gone 5" with 2"pin oliver rods with some extensive rework on the big end, didn't have to modify the cam though. the block will be real thin on the right side, doesn't hurt,just be careful. 4" bore in a 77 sleeve i believe is to much. a 88 sleeve can be used, you bore the block for it. flat side the upper flange where they meet. and bore them to 4". with custom built sleeves and rods i have been 4 1/8" bore and 5 3/4" stroke. with water in the block you could actually run the tractor without overheating. good luck with the right green. i'm looking to go to the darkside and build a farmall h.

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88

12-31-2005 07:58:14




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-31-2005 06:15:00  
I have put together several engines that have all held together for several years now,my current project is also a 77 I don't know if this helps you or not but I plan on going 4.150 x 5.25 using 77 rods.There will be some grinding but there is plenty of room.I would think you should have an easy time putting 4.5 in yours.Good luck.



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Clark Weaver

12-31-2005 11:01:52




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to 88, 12-31-2005 07:58:14  
Thanks so much for your input... I sincerely appreciate it. Over the last couple days, I've started to settle in on a 4"x5" motor. Based on your input, if 5" fits with 77 rods (assuming some grinding) then I think I will go that route. But, its looks as though the 4" bore will not leave a lot of room. If you've done this before, can you provide any input on what sleeves and pistons you used. Also, do you make your own head gaskets or what do you use there? Thanks again for all your input. Regards,

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Clark Weaver

12-31-2005 11:02:49




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-31-2005 11:01:52  
By chance, you wouldn't know anyone that would be interested in trading my Super rods for a set of standard rods? Thanks again.



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88

12-31-2005 14:00:52




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-31-2005 11:02:49  
By the time I bore the block to fit the new sleeves I will still have over .100 between all cylinders and over .100 wall thickness.I use a blank sleeve which I get from a local auto shop then cut them to my desired length and turn a stepdown on them to hold them in the block.It is alittle bit of a tight fit But I am sure there are those out there that would say "why stop there,why not go bigger?"and I say because I only want to build this engine once and as long as there is a speed limit I can keep up with the bigger motors (i.e. 3.5-4.5 mph).I have never done this on a 77 but the 88 I built 7years ago is still running good and so is the 70 and they are both over 5inch.Hope this helps I am by no means an expert just telling you what I know can be done.Good Luck

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Clark Weaver

12-31-2005 14:15:30




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to 88, 12-31-2005 14:00:52  
Sounds like an excellent approach for a reliable mill. What about a head gasket that will work with the 4" bore?



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88

01-02-2006 04:52:07




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to Clark Weaver, 12-31-2005 14:15:30  
Lubbock gasket in Lubbock Texas.You can find thier number online.If you do go with the 4x5 let me know , I have a set of 6 pistons that will work for you they are new never used.Can make you a decent deal as I have no use for them.



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Clark W

01-06-2006 05:56:40




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 Re: Oliver 77 Stroker Motor - What To Run? in reply to 88, 01-02-2006 04:52:07  
I have started to settle in on the 4x5 combination. Would you email me and let me know the cost and compression heigth of your 4" pistons. I have a set of 4" but the compression height will be too short (based on preliminary estimates.



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