How far in the hole?

When I pulled my original '69 318 cuda heads my pistons measured .039 down in the hole. In the original '69 Service Manual it states that the '69 318 came with 9.2 to 1 comp ratio. I also have a '73 318 and the pistons on that engine are .100 in the hole. After 1969 the compression on most vehicles dropped dramatically. If you have original pistons you should have high compression unless somebody changed the heads. I pulled my original heads to install some 302 casting heads and also install mag truck manifold on passenger's side with 340 manifold on driver's side. I really didn't notice very much difference in performance. So now I'm going to install a 2004R with 4:10 gears...that should wake it up!!:burnout:

Treblig