hi guys

after years of regret after selling my 21, i got a 28sp for the road

when i had the 21 (std motor, jha pipes) i used to race it on pump gas (96 here in nz)

Ive now got another 21 on its way for the track, the previous owner was running a 50/50 98 + avgas mix (av is 105 here in nz)

any advantages? I plan to pullk the motor down and check her over but expect from what ive been told that squish is std

if so, any reason to change from pump gas?

cheers

paul