Small block w/ 3.79 crank

I sold a Molnar 3.79" stroke crankshaft and 6.400" rods to a guy in Minnesota who drag races. I've had several inquires about 6.500" rods, but no one has ever purchased any from me.

3.79" stroke/ 6.500" long rods yields a 1.715 rod stroke ratio and gives you approximately a 1.25" compression height pistons.

3.79" stroke/ 6.400" long rods yields a 1.688 rod stroke ratio and gives you approximately a 1.305" compression height pistons.

Given that better flowing heads need less rod stroke ratio because dwell time needed at TDC using a super long rod is unnecessary.

With all these factors I would advocate using a 6.400" rod for several of these reasons and having an extra .050" of compression height in the piston will allow for more stability

and more room for the ring package. Unless it's a Comp Eliminator/ Heads Up Pro class engine and you need the last 2-3 HP I would build it for more longevity with the 6.400".

Tom