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Casting # is 14102183. Did not find it listed on the the Mortec web site. Can anyone help me identify these heads?

Small block Chevy, of course:p

Pulled these off the old smoker that was in my wagon. Block is casting #10243880, which Mortec lists as 1995-2000 Vortec 350 cid truck motor. Found out why it smoked. Cylinders were badly scored. Amazed that the previous owner rebuilt using this block. Oh well, was needing a reason to order that ZZ4 short block (only in my dreams!:D ).

Thanks,
Jeff
 

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Heads are 1989 170 h.p. 305 cu.in.
The block seems to be used in several applications:
"This engine block is used in 1986-99 Gen I heavy-duty applications. It has 4.00" diameter cylinder bores and four-bolt main bearing caps. This block is machined for a one-piece rear crankshaft seal. (Does not include rear seal or adaptor.) These blocks weigh 181lbs.
Technical Notes: Cylinder wall thickness is the same as current production engines. The lifter valley is machined for hydraulic roller and flat tappets. Crankshafts with two-piece seals can be installed with adapter P/N 10051118. (Block casting P/N 10243880 or 14093638.)"
 
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