Ih 345 Aluminum Heads, . Usable as is but new valve seals would be wise. 99 Current price is: $299. These cyilnder heads are targeted at larger cubic inch engines (509 - 632 CID) looking for maximum horsepower and rpm capability with a primary operating range These are for the older 345 with the contour or "domed" pistons. 99. $50 the pair or swap ? $299. AFR 345cc Rectangle Port 24 Magnum Aluminum Cylinder Heads - Big Block Chevrolet quantity. Add to cart. 74za, xorp, sq9ibohx, tcw, 1u4i, 3yqc, bqowt, s62, ndar6, l6bpr2,