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Tractor Pulling Discussion Forum

Oliver 77 Engine and Modifications

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05-01-2021 08:20:12

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Hello all,

I am coming here in need of some advice. I have a 1949 Oliver 77 which I think was put together from parts long ago. I noticed when looking at another 77 my engine doesnt look like there, mainly the placement of the block drain petcock and the hour meter plate on the distributor housing.

Now I am no expert and used google to the best of my ability, and havent came up with a for sure answer.
The casting numbers on the left of the block are

Top: 185220B

Bottom: IM100B

Vertical above the starter: F32355

I been told its a Super 77 block, been told its a 770 block

Would like to know what it really is if someone can help.

From there I am wanting to know how big a piston I can run. I dont mind having to have the block bored for custom sleeves, and I dont mind having to Bush the rod for a automotive piston.

Just wanting to get as many cubes as I can without having a stroker crank made.

Any and all input would be appreciated.

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05-03-2021 18:37:28

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 Re: Oliver 77 Engine and Modifications in reply to TinkerPuller, 05-01-2021 08:20:12  
Before you spend money on your 77 block. Find a 320 engine and spend your money on it. But the Big Oliver's start with a 426 from a gen-set. All these engines are Waukesha's which is what Oliver used. I have some friends that have some 400cu. Or so engines they might sell.

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05-02-2021 14:24:21

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 Re: Oliver 77 Engine and Modifications in reply to TinkerPuller, 05-01-2021 08:20:12  
If your lucky which I think you you have a super or newer block which should have 2 1/4" rod journal which can be offset ground to 2" giving you a 1/4" of stroke and use the rods from an early 77 engine. if you go with the 3 3/4" overbore kit an mill 1/8" off the top and your good to go. The head needs a lot of work (big valves and porting). you will have 265 cu.in.

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05-01-2021 12:17:54

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 Re: Oliver 77 Engine and Modifications in reply to TinkerPuller, 05-01-2021 08:20:12  
I highly doubt the block is right for a 49. I am just wondering what I have. I dont mind having the block bored bigger for bigger sleeves, I just wanna know what options are as making bushings isnt a problem to run a smaller pin. If I can machine the block for 88 sleeves and pistons and run the rods I already have, I would be fine with that.
Also are these wet sleeve or dry sleeves? I would guess dry.

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Craig Thompson

05-01-2021 12:00:07

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 Re: Oliver 77 Engine and Modifications in reply to TinkerPuller, 05-01-2021 08:20:12  
I am sure someone can help you with block numbers, But it sounds like you do not have a super motor. I believe the late model fleet lines started having Tach drive/hour meter plate below distributor.

The biggest oversize bore is a 3.75. If you go any bigger you would need to machine the block for bigger bore. I don't believe there is a off the shelf automotive piston that has correct wrist pin height for stock stroke so if you do not want to stroke it you would need to have a custom piston made or use a tractor piston from a bigger Oliver that may work, that would be from the 88 block family (88/1650) etc.

If rules allow you would be best with replacing the block with a bigger block, 88, 320 block or 310 block.

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