^^^ Correct
This is from Power Enterprise website.
How to select right size of gasket:
Standard of Gasket bore vs. piston size
Piston OD + 1.0mm to 2.0mm. The most of car manufacture design the gasket size to be 1.5mm to 2.0mm larger than the piston OD
Caution:
Do not overlap the tip of gasket and champher area
(See the picture)
Compression Ratio Changes by the thickness:
Example: 86mm stroke engine with 9:1 compression ratio can be reduced to 8.6:1 by adding the head gasket thickness, approx. 0.56mm.
Use 87mm Gasket for 86mm piston and 88mm for 87mm piston.
Major Distributor for the 91mm gasket: MAZWORXl 407-281-1223 (Mark)
-Drew