Quote Originally Posted by 383 chev
i tore my engine down to re gasket it cause it had some leaks and some other stuff i wanted to change so when i took the heads off i was looking for dome pistons cause the guy i bought the truck from said the C/R was at 12.5:1 well the look like flat tops to me. i was wondering if u guys could help me find the part number on the top of the piston it reads lw 5108 or 5018 cant remember which right now and its to cold to go out and look. i have looked at summit, jegs, and all the piston companys that come to mind.
The LW5018F is a 400 forged, lightweight piston, cylinders 2,3,6, and 7.
LW 5017F is the number for the other cylinders: 1,4,5, and 8.

Compression ratio is 11:1 with 64cc heads, 10:1 with 76 cc heads.

tom