440 stroker kits & rod ratios

[Midnight_Rider]

This is an ignorant question, hopefully not a stupid one. I'm not experienced at engine building, but trying to educate myself a little as I go along.

In looking at the 440 Source stroker kits, for 440's... I see they have a 4.15" crank and a 4.25" crank.

The 4.25" crank uses a 7.1" rod for a 1.67 ratio. 1.480" compression height piston.

The 4.15" crank uses a 6.760" rod for a 1.63 ratio. 1.867" compression height piston.

My question is, would there be any real benefit from a 4.15" crank with a 7.1" rod? Ratio would be 1.71 & compression height should be 1.535" for a zero deck at 10.710" (assuming that would get decks clean & square... which is what was needed on my block).

I know rod ratio is a debatable topic, some place more importance on it than others. I am questioning this more from a long-term street use angle.

[cdr]

not much difference in those ratios , go for the longer stroke, 

[BSB67]

Rod journal sizes are different between the two rods and two cranks, I believe.  So I don't think it is a direct swap.  You might find it elsewhere.

These rod ratios are not a concern.  Some factory production engines have even lower rod ratios, and probably the most recommended stroker is the 4.25 arm in a 400 block.