I have AFR315 heads. The part # for there stud girdle is 6210.

I run the Websters also, with B&B/Stef's style valve covers. They're pretty standard covers that everyone sells. Zero clearance issues. When you install them you need to slided them up and down to find the centers where the studs line up perfectly and don't pinch. Pretty easy to do, just take care when lining them up so they're no too low or too high on the poly locks.
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Im going to order these, doing some mill work on them, and powder coat them, I ran these on my 540's, look very similar to what Panther posted

http://www.ebay.com/itm/262449772294...84.m1436.l2649

Im also running CMI sweepers and the angle of the VC makes for good header clearance

I have imco covers they should clear I would think, I will look at the Webster girdles, they look much nicer then afr girdles..
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I bought a comp one a while back, fit like crap, not sure the issue,was on dart conv. heads, bought a couple sets of the cheap ones on ebay and both worked great so ??

It was asked when are the girdles needed or used.

My general answer to that has always been rpm and lift dependent. 5600 and under with less than .640 lift, I don't think it's critical (nice to have though). Once you reach the 6k rpm range or higher lift and spring pressures, I think it really helps to keeping things solid. Especially with a solid roller setup.

Just my general opinion but every build is different.

I saw the AFR one, seems the Websters are nicer and bigger... hmm

So this is what I would consider to buy what fits best rather than a particular brand. Another words just cause they have a good name and expensive doesn't mean chit. Just curious what engines merc uses them on.

So no clearance issues with Hardin marine style valve covers? I've always thought how much girdles must stabilize valvetrain and need for new SR SC builds.

Im running the comp cams/rhs girdles on my Engine Quest heads.

The ones on eBay you referring to red and same.basic style as the Websters or what ever ones panther posted pic of.