What is the 300ex"s stock compersion?

[bigbadbrad]

what is the 300ex stock compersion? what can i go up to and still be able to run pump gas(93 octan)?

thanks

[bigbadbrad]

oh yeah and would i have to run race gas or can i use pump for 11:1 ratio? and i meant what is the stock compersion ratio

[300exHILLER]

I think it's 8.5:1 is stock. I'm going to run 11:1 with an oil-cooler and a tad rich

[bigbadbrad]

are you keeping the stock bore Joel? i will probaly. i will get na oil cooler sooner or later. what kind of gas are you going to run?

oh yeah joel, i got the a arms on and they are alot beter then my old ones. the bearings in my old ones were shot.

[300exHILLER]

No, I'm boring .080 over ~297cc's I run 94 octane.

Cool I'm they worked out for you

[bigbadbrad]

i was going ot over bore it but i wil wait till next time i need to change the piston. i fi can find a place i will get my head ported and polished. i am going to get a cam but i a not sure if i need to get my rocker arms hardened

[300exHILLER]

I just priced out my whole motor with everything from my Sponsor and it will be around $1000. Thats everything but a heavy duty clutch

[Tweeked]

hey guys,
I plan on doing similar things as well. I would like to install a 11.0:1 297cc BORE KIT from powroll, then also get the WB preformance cam and spring kit.

How do you think it will run with all that and will I need to strengthen my rocker arms?


Thanks

[300exHILLER]

I would. if you don't have enough $$$ to everything right then wait untill you do so you don't have to rip the engine apart more than once.

[Tweeked]

Yeah i'm saving right now and plan on doing all that at once, so I won't have to tear back into it. And do you have any idea who stengthens the rocker arms, will your dealer do it or do you have to go to a preformance cycle shop? The only problem is, I can't think of any shops around here that would specialize in that stuff..