Let us know everything about the build so we can see what you really need.:thumbup: what all has been done to the engine ?
And to answer you question i don't think you will see any noticable difference in the gas mileage. from the 194 - 2.02 valves. JMO
The loss in mileage would only be very slight, probably not noticed. It depends a LOT on the head. Any oem sbc head doesn't need 2.02" valves and unless they are very heavily ported they will hurt performance. BUT refit a 220cc head with 1.94" valves and you'll lose power and mileage. It all needs to work together.
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