Seller notes

Used set of GM cast# 3964291 date code L 6 9 and I 11 9, have been magnafluxed ok, except for one exhaust rocker arm stud boss thread cracked, look at picture in between yellow paint marker. The crack is about 1/2" from top of boss down to about an 1/8" above the head bolt surface, shouldn't affect performance. Ready to be rebuilt. Needs at least 2 seats and had something go through the cylinder and dinged it up a little. Look at picture. These need to be rebuilt, guides, seats and head gasket s...

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