What i need to know is what meassure i have to use with the comp.ratio calculator, 3.750 wich is the ratio of one crankshaft turn,or 3.788" wich is the travel from BdC to TDC and it depends on piston comp height. The CR changes depending on wich of both you are using.
Thanks again
Did you check push on the piston to see how much it rocks when you are checking it like it is in this picture .
I haven't gone back and read the thread for your specs but I don't think you have too high a compression ratio to even be worrying about this if you are using alum heads .
What was the question again ?
Looking at the pictures the block has been decked , the .006 difference you are seeing is probably the tolerance stack ups. Do you have a good straight edge or have access to a machinists straight edge , check the block to see if it truely is wavy , I'm guessing it's not that bad.
If Hughes says you need higher compression ratio to use their cam and you want to run the engine the way it is then get a different cam. Contact member fast68plymouth and get a cam from him .
