NewZed Posted February 4, 2014 Share Posted February 4, 2014 I picked up some Pace Setter headers off Craigslist and thought some people might be interested in their qualities, since they're out there as an option, but there's not much about how they actually worked out. The 70-1037 model is supposedly designed for the 1970-1976 Z cars, implying that they are square port headers. But they seem to fit the round ports better. I compared a used square port MSA gasket, a Victor Reinz round port gasket, a P79 head, and the headers. The most obvious weirdness is two square ports in the middle with four round on the outsides. Not even trying to hide it. Put the the square port gasket on the headers and it looks like they'll disrupt flow on the corners of a square port head. But they look great on a round port head. I also found that the header flange is a full 6.5 mm (~1/4") thinner than the intake manifold flange. So some welding or clamp-washer grinding will be necessary to get them to seal. Even worse, the thick clamp washers land right on top of the weld. No test-fitting of the product before selling, apparently. Just putting it out there for anyone looking at Pace Setter. The design doesn't look bad in general, but the details are poor. Various web sites say the flange is surface ground or milled but they're not, just a scaly looking sealing surface, bowed in the middle. If you don't have the tools to make them work, you'll regret buying them. http://pacesetterexhaust.com/70-76-nissan-240-260-280z-headers.aspx http://www.summitracing.com/parts/psm-70-1037 Quote Link to comment Share on other sites More sharing options...
mmendes Posted February 4, 2014 Share Posted February 4, 2014 Wow, thanks for the info. I was thinking about picking up a set but now I will probably look at something different. Any idea if they fit any better on the 280s? Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted February 4, 2014 Share Posted February 4, 2014 Well the mounting surface will be exactly the same, which is really the important part. The steering column joint doesn't really change through the years. Quote Link to comment Share on other sites More sharing options...
Leon Posted February 4, 2014 Share Posted February 4, 2014 Rebello recommends Pacesetters, FWIW... Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted February 4, 2014 Share Posted February 4, 2014 Well I think that's more for the radius right off the flange. From what I've seen, most other headers (MSA) immediately start to go down, where these pacesetters actually go out about an inch. Also the tubing diameter may be different. http://www.classiczcars.com/forums/attachments/exhaust-s30/27667d1232138451-msa-3-into-2-headers-twice-pipes-imgp2568.jpg Quote Link to comment Share on other sites More sharing options...
NewZed Posted February 4, 2014 Author Share Posted February 4, 2014 (edited) The flange in that picture looks the proper thickness. The set that I have may be old, maybe Pace Setter actually changed their design to fix problems. Or mine might be counterfeit. Edit - Noticed that the center pipes in your picture seem to be touching, maybe even bridged by coating. They don't look like the current sales pictures for Pace Setter headers. Do you have the original thread for that picture? Are you sure that those are Pace Setters? Also, here's an eBay link to MSA's 70-76 offering. Square ports in to round flange holes. Can't tell if they do a better job of blending square into round. Any projection in to the flow path is bad, especially on the outer radius. http://www.ebay.com/itm/MSA-3-2-TBC-Header-240Z-260Z-280Z-Datsun-Ceramic-Coated-Motorsport-1970-1976-/261382593963 Edited February 4, 2014 by NewZed Quote Link to comment Share on other sites More sharing options...
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