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Old 12-21-2020, 08:36 PM
Douglas Willinger's Avatar
Douglas Willinger Douglas Willinger is offline
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Join Date: Dec 2017
Location: Rocky Mount, North Carolina
Posts: 178
Default SD Performance Discontinues CNC porting for Iron Head

http://www.sdperformance.com/listPro...?categoryID=53

Cast Iron Pontiac Heads

SD Performance no longer is CNC porting or building cast iron cylinder heads. Sorry for the inconvenience!

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Does anyone have any further information on this, particularly a source for such services?

Was looking forward to eventually having some #12s done for this.

Why would they discontinue this service, considering the investment in the machinery and programming? Saw a set of their ported iron heads - #48s on a 1969 2 bolt main Ram Air III- they looked quite excellent. Hopefully, they would reverse this decision or at least have the programming used by someone to provide this service.

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1970 Lucerne Blue Firebird Trans Am, deluxe blue interior. Original Ram Air III, M-21, 3.73. Being built as a 4" stroke "434" with SR 614 Ram Air IV heads

1972+ Lucerne Blue 4-door hardtop "what if" T-41 Le Mans Sport GT/Grand Am concepts. Equipped with future 3" journal "455 HO"/"what if" prototype "SD 455".
What if GM had continued production of the 1970-72 GM A body somewhere in the southern hemisphere?