Scrambler1 said:
Why are you planning on raising the compression ratio? N/A build? If so or if you are planning on using nitrous as a power adder then you're on the right path. If you are planning on supercharger/turbocharger than you actually need to go the other way and get closer to 9:1 compression.
Based on your sig you're building the motor now, if so I'd look at pistons first to get where you want to be.
I agree... if you're going to do it _right_ and see significant gains, build it that way. Decking the heads .020" or so isn't going to increase it much, and power gains will not be noticeable. IMHO, the same could be said for changing to a thinner HG. Doing both will get you a small net gain in CR.
For anything significant, I'd get a crowned piston, but consult someone who is experienced with these motors. Remember, there is engineering that went into the design of the combustion chamber of the head, spark plug position, intake/exhaust valve position and it was done with a specific piston in mind.
Bumping the CR a full point (not .100, but going from say 10.0:1 to 11.0:1) will get you a decent gain... but most likely a 8-10% increase in power at the most...which isn't bad, but don't be too disappointed if it's more like 5%. **Let me qualifiy this by saying I just threw those CR #s out there... that is NOT a suggestion on my part to bump the CR to 11:1. I used those #s as theoreticals ONLY.** This would just be a good foundation to run nitrous (as Scrambler1 mentioned) for a real kick in the pants.
Another option (since it sounds like you're doing head work) is to build the motor with lightweight internals and cam it to make power higher up in the revs. More air in = more air out = more power. The faster you can efficiently spin the engine, the more power you'll make as well.
Good luck.:burnout:
