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Sorry Jim. Here's a bit more detail: The Olds #6 heads were machined, ported and new valves were placed (not sure of the actual size). The lifters, rods, springs and rockers were all upgraded based upon the upgraded cam. The cam is a Comp Cams XE268 which has 224/230 at .050 lift with 110 degree lob...

Thanks Jim. I'll crack the diff cover as the fluid hasn't been changed since I've owned the car so who knows how old that is. I'll get the numbers off it and see what I have. To be honest, I don't have any desire to do many burnouts but I would like to get the car to accelerate quicker off a dead st...

Thanks Jim, excellent information and very helpful. Avoiding the treasure hunt to find 3.08 or 3.23's, would the 3.42 make the car obnoxious in the RPM's on highway? Car has 15" aftermarket wheels with 205/70 tires and it's a combination of city streets and highways around me here in NJ. Should...

Hi, When it comes to differentials, I have very little knowledge so looking for some advice/input. My '70 Olds Cutlass Supreme is a mildly modified Olds 350 mated with the original TH350 and stock open rear. Looking for a little more out of the rear but it's a cruiser and a part-time highway car so ...