Join Date: Jul 2008
Location: southwest lower Michigan
Re: 327 SBC Heads
Speedmaster is ProComp, they just changed the name a year or so ago, probably to get away from the negative publicity they had created for themselves with the initial junk offered by ProComp. They are all offshore imported castings.
A good portion of their product line has gotten better with each new revision they make when one production run is sold out and they revise for the next batch.
On their SBC heads, the only one I know is decent is the recent 200cc version, the 190, 195, 210cc version are not all that good. I know nothing of the 175cc, never touched one.
The ProMaxx Maxx series is getting a lot of good mentions/reviews in various engine build boards....the Maxx 183cc would be right up your alley if the Vortec idea doesn't appeal to you. Really good flow numbers. It's an import casting, but finished here in the US by ProMaxx.