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Super C additional HP

B

BoonvilleKid

Member
If larger pistons are planned for an original SC engine, are the original sleeves machined to accommodate the larger diameter or are new, larger sleeves required? Can the original piston rods be used with new, larger pistons? Are any changes required on the crankshaft if larger pistons and piston rods are installed?
 
Hi BoonvilleKid,

The early C had a 113cid motor, which was later changed to a 123cid. I believe both engines had the option of dome pistons for high altitude use. Most people rebuilding them opt for the 123 sleeves and dome pistons for a little more spunk. Rods, bearings and all are the same. Sleeves depend on the age of the block - the top flange and diameter of the sleeve changed during the production run. Best bet is to pull a sleeve and measure what you have, then match it except for the bore (3 1/8 for the 123, vs 3" for the 113).

Hope this helps. Ask if you need more info.
Well Worn
 
Pull a sleeve to get the measurement at the bottom then get the hi-dome RED POWER KIT 3 1/8 you can get around 10 HP increase the RPMs some and away you will go dont need to do any thing to the crank.
 
You replace the pistons and sleeves as a set.

A Super C already has 3-1/8" pistons, so the next step up is 3.25" to make it 133 cubic inches.

The block will need to be machined for the 3.25" sleeves, at the bottom, where the sleeves poke through.
 
Unless you are looking for pto hp I'm not sure the advantage of increasing the hp too much. The super C is already overpowered for what it can use on the ground. I've never stalled mine, just spun it out.
 
All depends on which block he has and over the yrs you sure dont know what has been changed thats why its important to remove a sleeve as only then you know what you have.
 
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