We have just finished putting the Y-block back together and noticed that the pistons were marked 0.90 over. The crank caps say 'ECZ' and the head's have a ECZ G'. All indications is that has been made into a 312 from a 292.
It is said that a 312 has a bore of 3.80 and over 0.90 is a bore of 3.84
QUESTION: What would the cubic inches be at with pistons that a 0.90 over ?
Thanks in advance,
Tim in Hot 'n Humid Florida

http://www.wallaceracing.com/cid.php

3.84" Bore
3.44" Stroke
8 Cylinders

Engine is 318.71 CID or 5.2 liters 

Hyvinkää, FI

bore x bore x stroke x .7854 x 8 = cubic inches. 3.840 x 3.840 x 3.300 x .7854 x 8 = 305.7435279 or 305.744 cubic inches.   Joe-JDC

JDC

If that block has ECZ main caps, then are you asking about a 312 that is .090 over?  If so, then the cubic inches will be different from either answer above.  3.890 x 3.890 x 3.44 x .7854 x 8 = 327.068, or 327.07 cubic inches.  Joe-JDC

JDC

Hey Joe,
Thanks for all the math work, I was terrible at math.....4X4= 12 ?
Sister Martha Marie disowned me as part of the humane race and that was in 4th grade.

Joe,
Thanks again, a Ford 327 cu inch is better than a 312.
I'll have to get the valve cover decals for a cheby that say '327'
Yes I spelled it 'cheby' 

Joe,
Here is my '56 Crown Victoria that the Y-block 327.07 sits in.
It is 3 speed w/overdrive, electronic ignition and 500 cfm carb.
Manual steering a brakes, Coker wide whites and Kelsey Hayes rims.
FUN, FUN, FUN
Once again,
THANKS,
Tim Quinn

Tim are those tubeless radials or tubes on those wire wheels?
Gary

Tim, is it possible that you looked at the piston upside down, and it is really the much more common .060 over 312?  A 312 + .060 would be 322 cubic inches.

John - "The Hoosier Hurricane"

The wording of the question is confusing, which has led to several different answers. .090" over on 3.80 isn't 3.84" to start with. And if the pistons are 90 over on 3.80 bore? That is one thin walled engine. especially if there was any core shift...  


Paul