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As I noted, the 4-2 cast manifold from the B20E and F engines was the standard offering in the Volvo R performance packages and is a very good option - if you have one. Since Mcloud is asking about acquiring a B20E head it would seem likely that he does not have a B20E or F engine which is what he would need if he wanted that particular manifold. You can purchase reproductions of the B20E / F cast header from VP Auto, CVI, Skandix.
https://www.skandix.de/a/1068116/
They are definitely not inexpensive and after you add in the shipping costs for a chunk of cast iron they very much fall into the expensive category. Especially after you add in shipping costs to North America I expect that the cost of the 4-2-1 headers may be significantly cheaper than an OEM cast iron manifold.
Salvage B20E / F manifolds are very rare. I have been tempted to fabricate a replacement for the OEM cast iron manifold from tubular stainless using one of these
https://martelius.com/en/volvo-b20-manifold-flange-set
They don't spec the thickness so I don't know whether they will work with the FI intake manifold. I would also need to find a competent fabricator!
The OEM B20E / F cast manifold did have issues with developing cracks at the merge. That is where my B20E manifold failed and I couldn't find a shop willing to do a fix. The 4:1 tubular header offerings are best avoided. The KG Trimning 4:2:1 headers look like they might be a viable option. About 1/2 the cost of a replacement OEM manifold.
IN North America the B20F head was fitted on fuel injection equipped cars starting in 1972 and continued until the last B20F was fitted in the very first year of the 240 series. The first B20F versions still had D jet. I am unsure about the 1974 B20F; but, I am very sure that in 1975 they were fitted with the first version of the K jet system.
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