[RICK LAKE]

180 from a dodge 383/426/440 motor in the early 70's. The hole is about 1/2" larger that the FE ones from Stant. I don't have the number. Best thing is to goto pepboys and get the old number for both. The dodge thermo is 2MM Flow hole is about 30% larger larger than FE one, you. You trim it down to fit in the manifold of your motor. Check the bridge for clearance and squeeze it to fit in some hose housings. It does drop the temp about 25-30F in 10 seconds. My motor numbers at 195-198 on track in hot days. Rick L.