This is our SSMS rules:
http://www.ssmidgets.com/midget-rules.html
Addmement 1a. Piston must be 3 ring design.
Aftermarket cam gears, sprockets, timing chains, timing belts may be used. All other STOCK OEM cylinder head components must be used. Welding on the cylinder head will NOT be permitted. Porting of the cylinder head including intake matching is NOT ALLOWED,
see (*).
Machining, grinding, sanding, or etching of the intake and/or exhaust ports is STRICTLY PROHIBITED. No altering of the shape and/or size of the intake or exhaust ports from OEM specs is allowed.
Fuel Injection: Constant Flow Mechanical or EFI with plenum or individual runner intake. Any programmable ignition/fuel injection systems are allowed, but must be readily available and have supported software. No carburetors.
(*)Notes: We are aware that there are many “built up” 2.0 Ford Focus engines out there. While we do not expect Focus engine owners to “fix/replace” any possible changes that have been done to the engine, we do remind that the Focus/SCREAM engine can not utilize any other head except the 2000-2004 Focus factory head. No aftermarket heads of any kind. Porting and polishing of Ztec head is ok.
Focus Engines: Aftermarket pistons (JE), rods, cams, cam gears, springs, valves, retainers, keepers. Adding, removing, lightening, chamfering or “knife edging” crankshaft counterweights is strictly prohibited. Must remain stock stroke...2 mil over bore ok, JE piston # 298717 or 298718
Oil System: Wet Sump
Engine Management Systems may use the following sensors: MAP (manifold absolute pressure), TPS (throttle position sensor), Crank, Cam, Water temp., Oil temp., Oil Pressure, Oxygen sensor, Fuel Pressure, IAC (idle air control, MAT (manifold air temp.), and EGT.
The use of Wheel Speed Sensors with management systems is prohibited.
Traction Control is illegal.