273 Head Gaskets
I did a little measuring. Give me a bit and I will slide one on a 920 head and see what it looks like. The measurements are close estimates each bore was a bit different. I see the smallest bor of the ones available through Summit are 4.040.
Thickness was hard to measure because of all the embossing. .030 was the fire ring and the .022 was the very outside corners near the outboard head bolt hole.
A = 3.815
B = 3.975
I did a little measuring. Give me a bit and I will slide one on a 920 head and see what it looks like. The measurements are close estimates each bore was a bit different. I see the smallest bor of the ones available through Summit are 4.040.
Thickness was hard to measure because of all the embossing. .030 was the fire ring and the .022 was the very outside corners near the outboard head bolt hole.
A = 3.815
B = 3.975