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63 mercury comet 306 c4/ and 64 mercury Marauder parklane 390 auto
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Amazon will refund, then order from Summit they stand behind everything,i ordered a $2700.00 shipment which never arrived as courier gave it to wrong address,Summit immediately sent me another no problem at all at no cost. I am now a big fan of their customer support. I had a melling pump in the order and it was definitely new and is working great.
 

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The factory pumps are fine. These are just 30% higher volume so they bump the oil psi. On the camaro, it had a new oring with the stock pump. I just didn’t like the pressure so I changed the pump to see an increase.
OK, so that's not true, as the pump bypass spring sets the high-pressure type, and pump displacement enables high-volume if clearances allow it -or- high-pressure if they don't and the bypass is set. Basic hydraulics. But your posts are a bit odd, don't directly respond to the thread, like a spammer setting-up post counts. 🤔
 
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