These are great heads...as good as any iron head Chevy made in the late 60's, and early 70's. Yes, they can be 1.94's or 2.02's but it seems they're all 64cc which usually made a little over a 10 compression ratio. The DZ (Z-28) motors and the L-48's (SS-350's) used these heads...can't remember any other applications. For the money ($200-400 pr used), you can't do better. Two thumbs up from Ol'Sleepy.
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