Quote:
Originally posted by techinspector1
The measurement from the centerline of the crank to the block deck surface is longer on the tall deck block, so if you put a 454 crank and pistons in it, the piston will be quite a ways down in the hole at top dead center. You can use this to your advantage by using longer rods to bring the piston crown up to the surface of the deck for a "zero deck". Longer rods will "dwell" the piston at top dead center for a longer period of time, allowing the mixture extra time to expand and apply a higher pressure to the piston. Long rods will also promote good ring sealing by pulling on the piston at less of an angle than short rods will, thus not cocking the piston in the bore as much as a short rod will. I'm not sure if that is what you didn't understand or not. Maybe it was the rod/stroke ratio thing. You can determine the ratio of any combination of stroke and rod length and the higher the number, the more power the motor will make, according to Smokey. Let's take some different combinations for instance. A 283 Chevy has a rod length of 5.700" and a stroke of 3.000". Divide 3 into 5.7 and you get a rod/stroke ratio of 1.9 If we increase the stroke to 3.25 and call it a 327, the ratio changes to 1.75 Further increasing the stroke to 3.480" with the same rods gives our 350 Chevy a ratio of 1.638 Hope this makes sense to you.
So Tech, you're saying I can get more power out of my 283 than my 350? I haven't built either, so which one could I sap for more power?