Differences between 2v heads?
Posting Guru
Joined: Aug 2000
Posts: 1,127
Likes: 3
From: (near) Denver USA
Originally Posted by monsterbaby
the early heads will fit either side, the later heads with the smog fittings are side specific, but if you are plugging them off then you can put them on either side as long as you can still bolt your accesserious up.
When AIR was introduced on the 351C and 400 (in MY1973 in CA), the external AIR ports were drilled through the intake manifold at the rear, and the incoming AIR ports on the cylinder heads were drilled in the intake manifold face, at both ends of the head (making them interchangeable from side to side).
When the 400 (and 351M) intake was redesigned to incorporate the AIR distribution passage within the manifold in MY1975, the new manifold design used the same AIR ports drilled into the cylinder heads, but at the front of the engine instead of at the rear.
The pic at the following URL shows the cylinder head AIR ports (#1) and exhaust crossover (#2):
http://home.earthlink.net/~bubbaf250...1M_head_05.jpg
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