351 v6 noisy?
Hello all, I have a 351 V6 in my 68 GMC. Runs great, but rattles a little at hot idle. Just seems noisy, but can't put a finger on it. The other day while standing about 15 feet behind it, could hear a tinny rapping sound, like when you click your tongue. For fun I put in a bottle of STP oil treatment and it seems quieter. Oil pressure at 700rpm idle before STP was 30. Now about 35. Previous owner used 15w40. Oil was fresh so I haven't changed it yet. Thoughts?
|