Just wondering has anyone used these? Would be a great option for a daily driven car.
http://thorntonmusclecars.com/product/thorntons-350-jr-exhaust-manifolds
Summit etc. claim fitment for 1964-1977 only, however Thornton's website says anything up to 1988 including 307's in G-bodies.
Due to port size, I was told by a coworker they wouldn't seal against 1986+ 7A swirl port heads? I always thought it was the other way around (too small header/manifold port was no good). Here's some good pictures for comparison:
http://tech.oldsgmail.com/307_heads.php
Definitely look to be a better match to the earlier 5A head, at least due to port size/shape. But I have 7A's, and not having a header option makes using the factory Olds engine a harder option (since the factory manifolds are such a poor/restrictive design).
Any ideas? What specific head design these would work on, or any/all small block Oldsmobiles?
http://thorntonmusclecars.com/product/thorntons-350-jr-exhaust-manifolds
Summit etc. claim fitment for 1964-1977 only, however Thornton's website says anything up to 1988 including 307's in G-bodies.
Due to port size, I was told by a coworker they wouldn't seal against 1986+ 7A swirl port heads? I always thought it was the other way around (too small header/manifold port was no good). Here's some good pictures for comparison:
http://tech.oldsgmail.com/307_heads.php
Definitely look to be a better match to the earlier 5A head, at least due to port size/shape. But I have 7A's, and not having a header option makes using the factory Olds engine a harder option (since the factory manifolds are such a poor/restrictive design).
Any ideas? What specific head design these would work on, or any/all small block Oldsmobiles?