Way to be a jackass, try reading the rules, and using the classifieds, not double posting, oh and good job bringing back a dead post Get hell out....
I read this entire post and learned a few new things. The biggest thing i learned is that sum HAMBERS are real Dicks!
Basically all he had to do was follow some simple rules, number one being intro is MANDITORY, and It is also real impolite to just spam a wanted add up on a forum without even thinking of adding content, it's the same solicitors when they knock on my door or asshole telemarketers. Hell this is the new polite HAMB, you should have been here in the old days
61 only produced about 152 and was rated at 360 HP. 409 HP came out in Aug of 61 for the 62 model change over.
I will find the earlier info, Don Nicholson won the Winter Nationals in Feb 1961 with a 409 http://www.superchevy.com/features/1609-don-nicholson-and-the-hottest-1961-chevrolet-impala/ Although his car was more than likely originally a 348, irrespective though some production cars were fitted with the 409, a recorded original 61 Biscayne 409 was dated May 1961
A member on the 348-409 forum has an early casting 2x4 intake dated June 61 prior to 881 winters manifold being cast
Here you go, some of the most knowledgeable people in the country in discussion on the first 409 http://www.348-409.com/forum/threads/61-impala-sport-coupe.18227/page-3 regards