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07-01-2012, 11:21 AM
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valve size VS gas mileage
hey everyone , just curious if 2.02 valved heads on a SBC will change my gas mileage negatively VS 1.94 heads
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07-01-2012, 11:49 AM
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Quote:
 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 Cole 
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07-01-2012, 12:42 PM
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All other things being the same, then no it will not hurt the mileage. Anything that lowers the dynamic compression of the engine will lower its efficiency, including fuel efficiency.
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07-01-2012, 12:56 PM
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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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