I'm thinking of putting aluminum roller rockers on my 88' K5, 350tbi. I called Jeg's today just to see exactly which sizes would fit mine and he said that I would have to use self aligning rockers since it has centerbolt style heads. Is this true? because if it is, the only ones that will fit mine are some $300 racing rockers. I was planning on spending $190 for the Crane Cams Energizer rockers. So I have 3 questions: 1)What is the difference between regular roller rockers and self aligning roller rockers 2)What model number is an 88' 350tbi called? They say in the Jeg's catalogue that these self align rockers are for the LT1 and LT4. Is mine one of those? 3)Has anyone converted to aluminum roller rockers? Is it worth it? Did you notice much more horsepower and fuel economy as they claim?