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Re: 57 Chevy Wagon - Californa Dreamin'
The Holley shorty headers arrived this week and are a mixed bag. On the one hand, the overall appearance and welds are very nice. On the other hand, the fit leaves a lot to be desired, plus the included hardware was SAE rather than metric. A straightedge across the flanges revealed fairly large gaps. They may pull down but the torque on the bolts is only 24 ft/lbs. If that doesn't work, you'd have to mill or grind the flanges flat.
Another passenger side issue was interference between the collector ring and the block which forced me to grind the corner of the block for clearance. The driver side doesn't have any block clearance issues, but two of the spark plug boots are hard up against the header tubes. It's like they welded the tubes in at the wrong angle. I'm probably going to make a run at their customer service and see if they can swap them out for some that fit right rather than trying to modify these. This is why I stuck with the stock exhaust manifolds on my last build.
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