Well, yea.030 is tight. I’ve run tighter. You have to be sure there is a bunch of V to P clearance. I’d rather run a .038-.042 on the engine with stock rods. Quality aftermarket rods can go less since there is normally less rod stretch at a higher rpm.
The quench difference on the street and most track applications isn’t going to be noticed.
Most current build in progress will have a .032.
