Super stock rules
*Any 6.5 factory rated small footprint engine up to 212 cc
Various Clone 196 , ducar 212,hemi and non hemi predator 212, 196 and 212 Tillotson engines ect.
Animal can be used but it would be the most pricey option.
6” Calipers, 1” drop dial or digital indicator and sufficient bracket to hold indicator over pushrod and valve retainers. Degree wheel for duration. No go or Pin gauge set for carb. Cc burette for compression
•Simple and to the point with no visual judgments calls. Yes or no on dimensions and stock parts comparison
*No coatings of any kind inside engine or on engine components. Exhaust pipe only can be coated.
*All “as cast and factory” blocks and cranks. No billet cranks. Minor grinding for cam,rod, and crank clearance allowed on crank cam or block. No excessive lightening. Welding on short block/sidecover for bracing and/or repair is fine.
*Bore and Stroke are to be stock per that engines factory specs. Over bore for a rebuild is permissible.
212 cc style engines
2.770 is Max bore
2.165/55mm is max stroke
+\-.0098 / .25mm on stroke
Animal
2.688 is stock bore
2.728 is max bore size (.040 over)
Max stroke for animal is 2.200 +\- .010
Clone blocks can be bored to same specs as 212cc
*Billet sidecovers without cam bearings are legal.
*Any factory Stock length billet rod allowed with stock flattop or stock dished 3 ring piston and stock compression height (per factory specs for that particular engine choice). +.01,.02,.04 rods allowed to get correct deck height as long as compression height on piston is still stock and unaltered.
No aftermarket pistons
*Stock factory valves. No aftermarket stainless steel or titanium valves. No tech on visual appearance but must be stock diameter.
Clone heads can be fixed to allow 27/25 mm combo
27mm intake and 25mm exhaust +\- .25
1.062 intake and .984 exhasut +/- .0098
*3 angles on the seat only, 1 angle on the valve
*Valve seat and bowl max inside diameter
Intake. .975 24.76mm Max
Exhaust .875 22.22mm Max
Measuring in 3 spots if no go is not available.
*Any aluminum or machined steel flywheels are legal. !!!No stock cast flywheels!!! 3.3 lbs min weight. No super light finless flywheels
*Cam is .276 max lift at the pushrod
250* duration at .050 max
.276 max lift at the valve
No billet adjustable cams
*install height is non tech
*10.8lb 18lb 22lb or 26lb single wound springs.
No dual or high tension single wound springs.
Compare to a known unaltered 10.8/18/22/26 lb spring.
(Length, wire diameter, outer diameter, coil spacing)
*aftermarket spring retainers allowed.
Aluminum or steel. No titanium
*Stock style stamped rockers only, ratio non tech but must be unaltered ball area and slot size
Grinding tips for lift is legal
Polishing of ball area and tips allowed.
*Studs and rocker nuts non tech
*Pushrod are non tech, no titanium
*Stock style flat lifters and must be magnetic
*No welding or epoxy added to heads as cast. Inside or out.
Porting is allowed.
AKRA porting tools for port size no go gauge for D shape Port Entry only
No tech on seat blending or touching valve guide
*Head gasket thickness non tech
*No piston pop out
*14cc minimum chamber volume
Check Cc like a stock clone
*Intake manifold non tech. Pulse from intake or crank case is allowed.
*Hl series Tillotson carbs with 1.000 max throttle bore and .900 max Venturi
*Gas or Methanol allowed
*Exhaust is non tech just needs to be braced, wrapped in a safe manner with a blunt or flared tip, trumpet, washer ect.
*Must have fuel pump and throttle cable kit mounted in safe working manner.
Tech procedure order
- Fuel
- Carb
- Lift at retainer and pushrod
- Duration
- Slide rockers off and check CC
- Ports, springs, and valves
- Confirm stroke and bore per engine
- Check for stock crank and 3 ring piston
- Flywheel