I am starting to put prices next to certain parts that I am going to buy. I'm going to start with the heads. Are there any other websites online that I can go to so I can check out some cylinder heads? I've been to www.yearone.com and www.summitracing.com. I know www.edelbrock.com and www.gmpartsdirect.com has some to. I want to check out both the LT1 and LT4 heads. I know the LT4 are better performance wise because they are aluminum and light, but the LT1 are more reliable because they are iron. So, I have to make a choice on which ones to get. I know mostly everyone recommends the LT4. Right?