Oliver Super 77 options

Rob Mo.

Member
Alright, I've been brain storming about tearing down my Super & bringing it back to new Life. I bought this thing 5 years ago to run the stack wagon on the farm & to pull at county fairs in the 5500lb. up
to 7000lb farm classes. I am wanting to go through the engine this winter & do some head work & re-sleeve to maybe 3 7/8" bore (Oliver 88 Bore). Currently in pulling the county fairs, I don't have the
power like the others do, its embarressing. Mind you, this tractor is still going to be used in the field, plowing & discing food plots, hauling fire wood, & running the stack wagon in the summer months. I
don't want to get too carried away. I'm going to build an adjustable hitch & i have press rims to put 15.5's on. Not too sure the taking the cast center stock rims are the ticket since I will be loosing weight
in the back & have to make it up with suitcase weights. I have thought about splitting the stock rims to widen them.
 
In my opinion, it isn't worth the effort to go to 3-7/8" pistons, either go with 3-3/4" or spend the money to go as large as possible. With the 3-3/4" pistons and a little work you can make 50 hp at 540 PTO RPM, the 3-7/8" will only give you a couple more Hp.
 
At pto speed my 88 with 3 7/8 pistons is making around 65hp,btw,this engine could plow or grind a load of feed. I'd say it pays to put the bigger ones in. The next plans are to bore it to 4 inches and stroke it an inch with 77 rods and Ford 351M pistons. We have some tractors that ought to have cut tires but like to hide in the "stock" class so it's a matter of monkey see/monkey do!
 

Around here 77s pull in 4000-5000#. The type of work that you are using it for is less than half the load of what it did when new, so you can lighten it without compromising it's ability to work for you.
 
Agreed, but if you do the math, calculate the increase in displacement and use a reasonable hp/in3 calculation, the gain is insignificant.
 
Compression is where the hp is, if are not going to stroke it and bore the block. 12 to one will really wake it up. But will take at least E85 gas.
 
bolt in a 310 or 320 will last forever and only thing might want to overheat if used for hard work still cheapest way to go
 

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