Re: 1970 Chevy "186" casting 2.02 x 1.60 heads
That's because they are 1.94 intake valve heads - at least originally. These are the perfect starting point for converting to full Z28 heads, fresh material for valves, seats, converting to screw in rocker studs and unshrouding the valve area. Good dates as well!
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Marlin
70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride)
69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride)
67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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