pump gas

[dashee03]

With my mods in my sig. will i have to run race gas if i advance my timing plus 4. I would like to continue to run 93 octane. Im 300 ft. above sea level if that matters.

[racer]

you would probably be ok. the porting will actualkly reduce your static compression, which is of course offset by the head work. however to be sure run a compression test with a good tester and make sure your cranking PSI is under 160-165.

[Animalman294]

Ya, It all depends on your compression. If you have detonation you better shut it down or get more practice crankin' those wrenches. Otherwise increase the octane level to compensate, and you may take a look at AV 100 (aviation fuel) 100 octane but not as pricey as race fuel.