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bob3240 · 11-24-2011, 11:46 AM

Lyn, I looked in McCarthy's Pontiac book and found that the high hp engines were called 420A. They had either 1-4bbl or tri power and 4-bolt mains. 531395 is the head no. The block has the shrouded trans mount so it wont fit the late trans. Bob Michael.

11-24-2011, 11:46 AM	#3
bob3240 Member Join Date: Jan 2009 Location: lebanon ohio Posts: 251 Likes: 3 Liked 16 Times in 5 Posts	Re: 1959 Pontiac 389 tri power HO engine Lyn, I looked in McCarthy's Pontiac book and found that the high hp engines were called 420A. They had either 1-4bbl or tri power and 4-bolt mains. 531395 is the head no. The block has the shrouded trans mount so it wont fit the late trans. Bob Michael.