650/X-2 650sx high compression head question

[Broha-X-Press]

Hello guys,

new to the site as well as the stand-up scene. A buddy bought a 650sx and i've had a great time riding it so i bought a 300sx for cheap with plans of doing an engine swap up to a 650.

Story is, ive come accross a 650 sx engine that i would like to trade for...engine has 0 hours since the top end has been rebuilt with wiseco pistons/rings and he has put a high compression head on it as well. I read online that high compression heads would require 110 octane race fuel. Just wondering if this is true or if i could get through withjust running regular pump gas or even 91/93 if i had to.


thanks for the help and i hope to not be a bother with n00b questions!

 

[agua]

Depends on how much Compression it bumps it up to, you can run pump gas up to 175 or so atleast, maybe higher

Welcome!

 

[JetJunky]

Anything above 180psi I would run high octane on, check compression though.

 

[Broha-X-Press]

thanks guys...trying to get a compression test from the person i'm trading.