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3.5 Is A Baby Northstar Overhead Cam Engine That Requires Alot More Maint.i One Saw A 3.8 In A Bonneville That A Customer Drove For Three Day With The Oil Pressure Light On When We Lifted The Car There Wasno Drain Plug In The Oil Pan And Not A Drop Of Oil In The Engine When We Added A Drain Plug And Oil The Engine Ran Flawlessly...................amazing