If stock, please leave blank. If modified, please let us know the brand and the stall speed (i.e. Yank 3600).

Please include info on your heads, i.e. 243 casting, ported/polished, etc.

How many thousandths from closed does it take to hit a flat surface that the heads are sitting on. OR, assembled method, how many thousandths from closed does it take to hit the piston at top dead center. Please let us know which method you are using to measure, (i.e. assembled method or to deck height method. Also need to know if you measured vertical from deck plane, or by lift).

Let us know how important driveability is to you. For instance, if you want it to drive exactly like stock and retain near stock gas mileage, select 1. If this is a race only vehicle where driveability is not a concern, select a 10, etc.