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Price: $489.00
You asked and we listened!
Brand new castings of the original 1970, 1971, 1972 W30 exhaust manifolds W&Z.Our Thornton Reproduction custom brings you thisthis larger version. With a larger body overall, and larger ports, you can expect better flow and better performance.Larger exhausts can be used with these. These W&Z's were made for 2 1/2" piping, but will/can be made to fit 2 1/4".
-Thesewill fit Oldsmobile engines in A body, G body, andB&C body 1970 and newer. Made for big block Oldsmobile 400, 425, 455 with dual exhaust.For small block engines, consider our 350JR's or our shorty headers.
-They were also used on 1969 big blocks; the difference is that in 1969, the left manifold had a heat riser. Some cars up to 1969 have the steering box in the way, and the only option for dual exhaust isour set of GM S&W manifolds.
-If you are looking for performance gains forracing then stick with long tube headers. These are not made for racing; they are made for better flow and to offer another option that performs better than the stock manifold performance.
Highly detailed for show quality restorations.
LH manifold "W", Thornton part #HF21455L.
RH manifold "Z", Thornton part #HF21455R.