Ok so here's the deal. I have the 14101128 the stock heads that came with my 87. I had an overheating issue with exhaust also pressuring the cooling system. I removed one head so far and noticed a small crack in the bolt hole. I also have a set of 14102187cast iron heads that will swap over according to a visual inspection. So the questions are cracked aluminum head. 1. What would the cost be to have a machine shop repair it? 2. Has anyone ever used these 14102187 heads? If so what's your thoughts?