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My question is this, out of all the Forum members on here that have had their heads removed and reworked or replaced with the heads and cam package why hasn't at least one of them asked the speed shop that they have doing the work on their engine to have company they send the oem heads to , to have the valve guides and valves mic'd and the results given to them and the owner posting the results with the mileage and type of driving that was done on those particular heads This is what baffles me. Was there an extra expense involved in doing all that and just didnt want to pay? Or did they think that it wasn't worthwhile letting the rest of the Forum members on here know what the results were to put this question into some sort of perspective because we all have questioned the data thats out there already. I just know that I'm not going to be one that openly gives my car to someone to replace the heads and not ask questions.I want to find out where the issue is if any and share that information with the rest of you. Sometimes I believe that we all just get caught up in our own little world that all we think about is going fast. I bought this car because I want to keep it. I want it to last.I want to use it for what it was designed for and if there's something that I need to address then I want to address it and I want to know what caused it and fix it right with the correct materials. not just relying on some Speed Shop to send my heads off and return them telling me your good to go now. I'm at almost 13k miles on mine, (and so far all is well), with factory powertrain warranty still in effect. Unless I just get totally impatient and I can't wait anymore, whenever my warranty is up it's guaranteed my heads are coming off and they will be mic'd and the results will be posted on this form unless there's a catastrophic failure between now and then that takes place. We have aluminum heads now no longer cast iron changes had to be made in the materials that they use to increase the longevity we all know this but make sure you use the proper metals when talking about valves and valve guides. Everyone knows when you increase lift you have to increase spring pressure and when you increase spring pressure you increase the side load on the stem so that was a good point that article pointed out in my opinion about increasing the links of the guides themselves. I don't come from a Big Town but there are some places that will actually sit down and talk to you for free and explain things that you may be concerned about. Maybe I'm Wrong maybe someone out there has the results that just hasn't posted them.but it sure would be nice to hear the findings. PS. I just hope no one out there takes this post the wrong way because I meant no ill by stating it. I just want to make sure that we all as owners of the 5th gen Z28 ( possibly the last) are not being misled for capital gains by some,because the issue was actually addressed and fixed at GM.
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