[jonny_b]

how true is it that with a big cam like webb4, x4, or 5050, a 12:1 piston is pump gas safe at say 1000-2000ft. i have seen this a lot of places and am a little skeptical, but since i'm not a motor expert, just i thought i'd ask some people a little more knowledgable than me. and searching this out has resulted in many hrs of reading useless threads. :lol:

 

[hitmix300]

and I thought 11:1 was the cat's ass.. the higher compression u go you can run whatever fuel you want, but obviously for HP gains you'd wanna run alky

timing, fuel and all that jazz go hand in hand.

 

[dl700]

the more overlap in the cam the more compression you will be able to run on the lower octane...
the HDD5050 is pump gas safe for 11:1.... any more and your pushing your luck... this is assumed your riding at sea level...
the higher the elevation the more compression u can safely run