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there are the same closed chamber as the 915 hp 440 heads, just they have small 1.60 exhaust valves, with seats and 1.74 valves installed same power as the 915s,with 2.14/1.81 valves installed they make huge power, if your gunna do iron heads they great heads and cheap. i get 100-200 per set complete

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WRONG!
The 516 heads have a port shape more similar to the 452 casting. Only the 906 & 915 share the same port shape.
If you can get those to perform better than my 915's I'll buy them off of you

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