H hewe Member Dec 8, 2011 #1 Is the old 233 and 255 thermostat housing the same bolt pattern as a 302 or 351w?
C craig Senior Member Dec 9, 2011 #2 I am not familiar with a 233. A 221,260 and 289 use the same housing as a 302 and 351W
J junkyardjeff Senior Member Dec 10, 2011 #3 I dont think those have a place for the bypass hose like the small blocks do.
