The 138190023C Clone Thin Metal Gasket is found on 196 clone engines. 

This gasket is the non-coated metal head gasket used to gain compression on the standard 196cc or 68mm blocks. The head gasket fits the 68mm standard bore and bore sizes up to +.75mm over. The head gasket fits most 68mm bore blocks including Clone 6.5hp 196, Ducar 196, Tillotson 196R/RS, Box Stock 196, and Honda GX200 Engines. This gasket does not fit 70mm 212 Engines

Gasket Specs

– Metal

– .009 ± .001 Thick

– Maximum Bore 68.9mm ± .05mm

AKRA 2020 Rules for Head Gasket

Head Gasket/s maybe aftermarket, must be of stock configuration, gasket thickness is non-tech item, sealer allowed to insure proper seal. 

NKA 2020 Rules for Head Gasket

40.4.19.4: Minimum Combustion Chamber Volume

Minimum combustion chamber volume when mounted on engine @ TDC is 26.5cc. This is to be done after the event and when the engine has cooled down to

a reasonable temperature. The Head gasket required, but thickness is non-tech and can be either steel or aluminum. Multiple head gaskets are allowed.