Stock compression Vs. 11.0:1

[N A]

Does anyone know what the stock compression ratio is? How much hp could I pick up if I bumped the ratio to 11.0:1? Could I get away with 93 octane or do I need something higher?

[mrltd]

9:1...you could get away with 93 and 11:1, but you'd have to be really conservative with the timing. Anyway, with the way gas prices are going..WHY?

[DuceAnAHalf]

11:1 compression would mean about 10 deg of base timing and require at least 100 octane gas also very carefull selection of cam heads and pistons to prevent piston to valve contact

[N A]

I don't worry about gas prices. The gas card is paid once a month. What's the highest ratio with E7TE heads, 9.5:1 or 10.0:1?

[mrltd]

As high as you want. All depends on the pistons and heads. And the valve clearance...

[Grand Marquis GT]

Also, with a higher compression motor, it will run hotter.

You will want a killer cooling system...

[gadget73]

you probably want to make sure you build a nice strong bottom end if you're running that level of compression. Also good quality head bolts and gaskets are a must.

[phayzer5]

you wont get 11:1 without new pistons. If you tried decking your block and heads to get near 10:1 you'd more than likely have issues with your intake not matching up

[N A]

Thanks for the info.

[Fairmont Kevin]

You have to match all your components. With the correct cam and with aluminum heads, you can possibly run 93 on the street. The gain from compression alone is ~4% per point. So going from 9:1 to 11:1, you'd gain ~8%, or ~20 hp on a stock HO. Assuming you could fuel it, which you basically couldn't. Add the right cam and heads (and other parts) and you'll get a hell of a lot more than 20 hp....