I called Revmaster Tuesday, but got no answer. Today was better, and I talked to a guy about their heads, hoping to find some with nice air passages as well as "advanced" valve seats. The photo on Revmaster Aviation's website only shows the chamber side, and their website in general had lots of issues, such as an inop price list. He told me to go look at the photos on the automotive website, since they were the same RM-049 heads for either application. After seeing that photo, I was not impressed that the passages are much better than what has become normal for VW head castings, although the castings are clearly not stock VW derived. He also said their seat material was something like "latest technology that others are also using, not just cast iron", for what that's worth.
I've been conversing with DRD Racing for a few days, and their Chinese-derived heads do indeed have large cooling passages. Given the overall quality of these castings, I'm going to ASSume that they wouldn't install crappy seats in an otherwise decent looking head, so I've ordered a pair, especially after seeing a photo that DRD provided today. I'll update y'all when I have a pair on the work bench and can get better photos, but the best I can do for a comparison at this point is the two photos below (or enclosed, I hope) of a Revmaster RM-049 and the DRD "OEM 43" head passages. Cooling trumps seat life, at this point in my life. More after I do some testing on these heads. This may prove to be a dumb idea, but somebody's got to try them out... Mark Langford ML at N56ML.com http://www.n56ml.com -------------- next part -------------- A non-text attachment was scrubbed... Name: RM-049.JPG Type: image/jpeg Size: 31869 bytes Desc: not available URL: <http://list.krnet.org/mailman/private/krnet_list.krnet.org/attachments/20160623/8451549e/attachment.JPG> -------------- next part -------------- A non-text attachment was scrubbed... Name: DRD_passages_small.jpg Type: image/jpeg Size: 72750 bytes Desc: not available URL: <http://list.krnet.org/mailman/private/krnet_list.krnet.org/attachments/20160623/8451549e/attachment.jpg>
