The governor 1" carb spacer plate and restrictors.
IMCA SPEC ENGINE RULE: At all weekly sanctioned point events, spec engines must run an unaltered one inch carburetor spacer.
-The Governor carburetor spacer (PRP100125000)
-(4) - 0.950-inch restrictors (PRP100125095).
Maximum 0.100-inch thickness gaskets only, one on top and one on bottom of spacer.