race gas pistons?

[qboronyrican]

im looking to get a cool head and thinking of going with 20cc or 19cc domes and runing half pump half race gas but was wondering if i had to replace my pistons if im using race gas or are they the same regardless the gas ur using?

[Washburn]

No you dont have to put new pistons or rings in if your compression is good. Race fuel is the same as pump just more octane and lead. Some are oxegenated some have NO2 in them Like U2 witch may call for a rejet. If your running 19cc domes I would run at least 50/50 110 and 93 or straight AV gas. get the crank welded espically if you plan on advancing the timing. That much compression will separate an unwelded crank alot of the time.