[Steve1968LS2]

Originally Posted by ProdigyCustoms

Carl Wegner and I had this conversation over dinner and cocktails. The man is so smart with these things it is crazy. But I know a thing or two so I keep up pretty well.

The LS motors are , well most motors in general, but especially LS motors are sensitive to rod length to stroke ratio. Bigger is not always better. I can verify this based on a 421 Small block my body guy just built (to be bigger then my 404CI) that won't fall out of a tree. It is built identical to my 404CI with a TENNIE bit bigger cam for the slightly more cubes, but it just doesn't have the snot my 404CI motor has. And we think it is rod to stroke ratio.

With that much stroke you will need a super long rod and the pin height in the piston wont allow a good rod length and good ring package.

I would only be going from a 4" stroke to a 4.125" stroke.. (6.125" rod).. most of this is being made by bore size. Or if I can get the right pistons I can stay with a 4" stroke

I should probley talk with Carl.. I know enough but I'm no "expert"..

The key to this whole deal is the Darton part. This lets me have the bore of an LSX iron block with the weight of an LS2 (I think the sleeves add 9 lbs)

To be honest I'm more curious/concerned about going from 4" to 4.125" on the stroke due to oil pan/windage tray clearances.