I don't know why, but the tubes on many of these oil dipsticks are too small for the cylinder block. The pipe on this one is too loose for my 283 block. I ended up finding a GM works pipe and it fit just like it should. I've encountered the same problem with many different GM blocks and other brands of aftermarket oil dipsticks over the years. The actual dipstick and knob are fine, but it doesn't matter if the main pipe is free to rotate in the block. I had to send this back to get a refund.
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