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sundlh
Welcome to the Pelican forums!
Unfortunately, the early 3.0L engine MY 1978/1979 have a different flange then the late style heat exchangers (MY 1981-1983). The heads exhaust ports are different sizes on the 78/79 versus 1983 heads exhaust ports. Thin flange versus thick flange is the issue I believe.
I hope you can get some resolution with this issue via the seller.
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Ed Paquette
1983 911SC
1987 944S
1987 944 Manual (Donated to the Nat. Kidney Foundation)
1987 944 Automatic (Recently sold to another Pelican)
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