Does anyone know the dish volumes (in cc's) and compression heights of stock Buick 455 pistons? I'm interested in both 1970 and late 70's piston info. If it's not readily available to anyone, do you know where I can find out? Thanks in advance,
Dan: The 70 piston is either 22 or 23 cc's. Fred Dodd did a nice write up on George's site with what he found for dish cc's in the various pistons from the 455. BuickPerformance.com
Larry70GS posted this pic over in this thread.. http://www.v8buick.com/showthread.php?t=132200 http://www.v8buick.com/attachment.php?attachmentid=72643&d=1146969666
From my earlier post: "...Both the Sealed Power 70 and the GM 73 measured 1.975" pin (compression) heigth. The GM 76 measured a lower 1.935". So, the 76 sits 0.040" further down in the hole relative to the 73. But the dish on the 73 is 0.040" deeper than the 76. The means that the "floor" (if you will) of the dish is the same distance from the head for both the 73 and 76. So the 73 and 76 piston will give nearly the same CR in a particular engine. I said nearly, but the 73 has higher dish "walls", taken up slightly more volume, giving slightly higher CR..."
