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I had a set on a 470 ci in my 63 Belvedere bracket car ran 10.80's for 2years then sold it to a drag weeker who ran it hard with nitrous deep in the 9 sec quarter mile. He finally pinched a ring and not sure where the heads ended up.The castings of the heads was really good. I currently have...
One other thing is the poly has 1 bellhousing bolt that is in different location than all later SB engines.i think it is the passenger side bottom. it's no big deal but it will keep you from scratching your head wandering why it won't go in.
I put one of these on my drag car it sat all winter in climate controlled shop and would not start after setting 3 months. No spark ,power where in needed to be. Put Accel 300 + back on and fired right up. Just sayin.