Looking for some info....

Chris5

Member
I looking for some info on putting larger sleeves & pistons in a super 77 gas. I have herd to stay away from the M&W because you loose compression and power.. is that true with the new ones from korves as well?
This is going to be a pulling tractor but I would like to still run coolant in the block. I have herd you can use 88 sleeves and get the block bored. What else do you need to do in order to do this? Do any of the sleeves need to be turned at all or what issues might I run into? Would any other sleeves work or should I have some made? I have been having trouble finding much info on this.

I have a few other things in mind I will be doing to it as well.
 
How many cubic inches are you looking for? Are you going to farm with this tractor? An easy step would be a set of 1550 550 (3-5/8 inch bore sleeve and pistons. Then use the 550 valves and do some major bowl & port work to the head. Are you going to offset grind the crank and add stroke/ Are you more interested in horse power or torque rise?
 
Its going to be used for stickily pulling. Im offsetting the crank for 4". Head & cam work, intake and carb, clutch.. the whole 9 yards with all of that. Im just a bit stumped on going about larger pistons/sleeves the a "OEM" 3 3/4 overbore.
 
Im looking for more HP & Torque, I have not pulled with it yet to see what it had for power. The engine was a little tired with low compression on some cylinders. Id like to try and build it once and have it last with some durability and reliability.
 
Chris, I've had the 3 3/4" in my 77 for over 30 years with no problems and I pull up to the 10500lb class with only 265 cu in and spins out with 16.9-34s and still can take it to plow day and pull 3 14s in fifth gear all day, the 3 3/4" will work just fine for what you want. Chuck
 
I was thinking of sticking with the 3 3/4, the reliability would be much greater id imagine. And the cost diff would be huge.
As for the cam is there a certain grind you would recommend? I am thinking of using competition cams or bullet cams.
 
Chris, I used comp cams, just told them the rpm range 1600-3000 and they took it from there. My engine make good power from 1600 all the way to 4000 rpm. Chuck
 
Your pulling is differen't than ours. Hook onto the Hotfoot sled and you would power out in the 4500 in low gear. It takes a good 77 to pull 3-14's in 3rd around here.
 
bolt in a 88 engine would be the way to go our even a 310 ,320 if your rules allow,and in the long run will be cheeper and make alot more power
 

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