Originally Posted by getrdunn (Post 4520292)

Might be one soon!!!!!

Originally Posted by MILD THUNDER (Post 4519893)

Look up Steven Sun on facebook. Hes from Hangzhou, China

Originally Posted by MILD THUNDER (Post 4519658)

I also think there are some advantages just from the rigidity of cast iron, esp on engines running boost or nitrous. You have a cylinder head that expands at the same rate as the iron block they are bolted onto, the decks are extremely rigid , head "brinneling" is really not an issue, etc. When a thick iron head is clamped to the block with head studs, the clamping is excellent.

My old aluminum dart heads, had some sure signs of brinneling after 4 seasons of running. Not surprising, since I was running MLS gaskets with stainless wire fire rings. Felpro themselves admits that with an alumnim head, you will get some dents in the soft aluminum deck with those, as opposed to , a copper wire fire ring, that is softer.

Originally Posted by cigrocket (Post 4523447)

So did we get some flow numbers for the final porting? I was wondering how they compared to the CNC version that Promaxx offers. I was wondering if the CNC version would actually be cheaper in the long run because less hand porting and cleanup would have to be done which would save in labor costs. Just wanted to know the flow on these bare heads. I am looking at possibly buying some sets in the future.