This is what Mr Wallace Says
Static compression ratio of
10.2:1.
Effective stroke is 2.74 inches.
Your dynamic compression ratio is 8.04:1 .
Your dynamic cranking pressure is
160.92 PSI.
V/P (Volume to Pressure Index) is 135................................................
135
This is what your compression tester is saying
Static compression ratio of
12:1.
Effective stroke is 2.74 inches.
Your dynamic compression ratio is 9.42:1 .
Your dynamic cranking pressure is
197.35 PSI.
V/P (Volume to Pressure Index) is 166.............................................
166
If after repeating the test with a warmed up,pumped up engine,and the numbers haven't changed much, you will need a second opinion
160 should be fine on pumpgas with that 650, and a solid cooling system.
200 is guaranteed trouble.......with iron heads.
To get a 10.2 with a 365 engine would require a swept of 748, and a total chamber volume of 81.3cc.
With your parts, say 65cc heads, an 8.9 gasket and 5 in the eyebrows, will require 2.4cc in the decks or; pistons down .011, so that sounds about right. I wouldn't call your gauge a liar,....yet
Some guys have reported success with 200psi,aluminum heads,tight Q, and pumpgas. You got the right cam, to make that a funtastic street engine. A VP of 166 is pretty awesome. With a manual trans VP becomes very important.Your 3.23 may be able to carry you all the way to 60mph
for comparison, here's a 69 440 with a 268/284/113/.450 cam, ICA of 67*
Static compression ratio of 10:1.
Effective stroke is 2.83 inches.
Your dynamic compression ratio is 7.79:1 .
Your dynamic cranking pressure is 154.44 PSI.
V/P (Volume to Pressure Index) is 154................................................
154
As you can see 166 is way more than you need, but it sure is fun
Read about V/P here .
V/P Index Calculation