My 322 is about done.  Only thing left is to calculate how much dome to cut off pistons, followed by balancing, and I need to get it right.  Pistons are .004 out of the hole.

Cylinder bore 3.86

Stroke 3.44

Head gasket bore 3.86

compressed gasket thickness .043

chamber volume 70.5 cc

Piston dome 2 cc

Piston deck clearance -.004

compression ratio 9.68:1

With a 3cc dome the CR goes to 9.8, but that begins to make me nervous.  Maybe with the quench being .039, I could get away with the 9.8?

Here is the thread regarding the target CR and dynamic compression on this engine and cam, done this last March.  http://www.y-blocksforever.com/forums/Topic57116-3-1.aspx?Highlight=dynamic+compression 

Mike.  Using 4.25” for the bore will net you 10cc for the head gasket volume if using 0.043” for the thickness.  Once you calculate the amount of dome volume you need, then each 2.7 grams you cut off of the dome will reduce the dome volume by 1 cc.  You can also re-examine the dynamic compression ratio as that may be a better indicator of what the engine will tolerate for fuel. You’ll need the exact intake closing value after BDC and the connecting rod length to calculate this.   The EMC engine had a static compression ratio of 10.8:1 but the dynamic compression ratio was 8.5:1.  This combination ran fine on fuel that had a MON octane value of 86.

you could add 10cc to combustion chamber size and put zero into gasket thickness etc.

stuey