What is a "d series single seater"? A race car? Street legal? Check with your state DMV on the rules for home built vehicles. You might have to pass emissions testing based on the year of your engine. Another engine option is the air cooled VW boxer moter with transaxle. Light and compact. Tons of performance parts. Every gear ratio available that you could think of. Stone simple with lots of pre-EPA engine cases around.
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