This cutaway comparison of a standard 3.8-liter block (left) and a heavy-duty 3.8-liter block (part No. 25500003) reveal thicker main webs, an additional lifter valley rib and heavier pan rails. The H ...

I have a normally aspirated 1981 Buick 231 V6 in my hot rod and was wondering what flexplate to use. It seems there are internal balance and external balance applications. Is there any reason I can't ...