Superformance headers were developed to fit a stock OEM 351W exhaust port configuration. With the development of the SBF large port heads from Ford Racing, AFR or Dart, with the addition of a wider bolt pattern Firefly was able to develop these large port ceramic coated stainless steel headers to further increase flow over the standard Firefly 351W headers.
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Large Port 351W head - Note additional header bolt holes
FPP "Z" vs SPF headers
FPP Customer Cars
We try to keep these in stock
Call for availability
Installation available @ Craig's Cobras