Damn, sure could.  Why didnt I think of that .

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Mike

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

stuey

Thankyou VERY much.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

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.

Lorena, Texas (South of Waco)

This is what the available calculator shows with the variables.  Target is 9.7 CR:

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, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

The various CR calculators I am aware of call for entering the "head gasket bore diameter".  Since the gasket "bore" is more than a circle, the variable has always been curious.  But now I need the curiosity done away with.  Ted has stated that the volume inside the head gasket "bore" for a Felpro is 10cc (if remembered right).  What calculator is out there that lets me put in the bore volume, rather than bore diameter and gasket thickness.

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.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.