The grill is not original. The grills were introduced to the dealers in 1963 mainly to &amp;quot;update&amp;quot; any 770 &amp;amp; 550 tractors in their inventory to have them look like the 16,18 &amp;amp; 1900 tractors. Of course the 550 &amp;amp; 770 stayed in production so those models with the fiberglass grills are more common. What kind of freeze damage does your block have? Have you ever heard of pinning a block? It is a cold crack repair method which works very well on many cracks. Send me a U2U if you want some details.