I got this Buick nailhead with a project and have been trying to ID year and size sites say different things and years. Here is a picture of the engine and numbers
https://www.teambuick.com/reference/ident_engine_59-62.php https://www.teambuick.com/reference/us_35-76.php 4H prefix is a 1961 401 Wildcat 1st digit is the car series: 0 = Special V8 (4000) A = Special V6 (4000) 1 = Special Deluxe V8 (4100) B = Special Deluxe V6 (4100) 3 = Skylark V8 (4300), Sportwagon Custom (4300), or Sportwagon standard (4200) C = Skylark V6 (4300) 4 = Special (40) or LeSabre (4400) 5 = Super (50) 6 = Century (60), Invicta (4600), or Wildcat (4600) 7 =Roadmaster (70 or 75), Electra (4700), or Riviera (4700) 8 = Limited (700), or Electra 225 (4800) 2nd digit is the model year: A = 1954 D = 1957 G = 1960 J = 1963 M = 1966 B = 1955 E = 1958 H = 1961 K = 1964 C = 1956 F = 1959 I = 1962 L = 1965 3rd digit is the ***embly plant code: 1 = Flint, MI 2 = South Gate, CA 3 = Linden, NJ or Fremont, CA (1964) 4 = Kansas City, KS 5 = Wilmington, DE 6 = Atlanta, GA 7 = Framingham, MA or Baltimore, MD (1964) 8 = Arlington, TX or Kansas City, MO (1964) Last six digits are the sequential production number unique to that particular car: starting at 001001 for each plant for 1954-1963 full size cars, all 1964 cars starting at 501001 for 1961-1963 Special/Skylark https://www.buicks.net/shop/reference/nailhead_casting_numbers.php https://www.teambuick.com/reference/casting_numbers_nailhead.php
Good idea to ID your engine . There is a lot of less than reliable info out there. My Wildcat left the factory with a 401, (according to GM info archives) and the "experts'' claim there were no 425 s produced in Canada, and yet my car has a "4704" block. The numbers on the area in front of the valley cover make no sense. ( Due to being in Canada) There are no letters at all,( should have a K in there) only numbers. Are you planning to run the Offenhauser 2 x4 ? If not I would be interested.
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