The longer rods increase dwell and change the angle of attack. Essentially giving the rod more leverage to move the crank and less side loads on the pistons to their bore. It is costly for all modifications and the end result is sometimes less than one would like. I agree with your decision 100% to make it better, especially in the valve train but you need to ensure it is as reliable as possible. That was what I was suggesting earlier. If your car doesn't want to start (like my old 11 to 1 SBC) you just step out onto terra firma and give them shoes a chance. On the water it is a little more complicated. Your approaching terminal velocity..
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