Jerry makes a good point that it depends on what your existing manifold/exhaust pipe setup is. I hope I didn't mislead you as I think since yours already had a donut seal that the flat gasket will likely not work properly for long.

My '51 3100 has a '54 passenger car engine which uses a donut seal. Knowing what I know now, I'd say you will need to replace that flat gasket to seal up your exhaust properly.


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)