![]() The bog was much better, but it was still there. I suspected that the 4.5 power valve was the cause of the bog, so I put the old 6.5 power valve back in (I left the #65 jets in) and went for another drive. The engine was fine at idle and above about 2000rpm, but it fell on it's face when I accelerated from idle up to 2000rpm. I installed the new 4.5 power valve and the #65 jets. The current #69 jets sounded pretty rich, compared to the original #64's, so I picked up a pair of #65's and a pair of #67's. I also picked up a couple of pairs of jets. That's not what it had originally, but the 4.5 is all that the store had at the time. The engine idles fine, but my carb is a pre-1992 with no power valve protection So, I bought a new power valve that is calibrated to activate at 4.5" of vacuum. My first guess on the cause of the rich mixture was a blown power valve. I can't tell for sure what power valve I have, but I think it's a 6.5 like the original. The previous owner jetted up to #69 jets. Originally, the my 4160 came with a power valve calibrated to activate at 6.5" of vacuum. So, I'm trying to retune my Holley 4160 (600 cfm) to keep the same thing from happening to this engine. Those of you who read about my reman engine know that "overfueling" killed my first reman engine. The reman (stock) 360 in my '88 Grand Wagoneer is running rich. Sorry about the length of this post, but I wanted to give as much detail as I could. I'm looking for anyone who knows about Holley carbs. ![]()
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