I'm fairly decent at id'ing noises but this one's a little weird. Firstly the engine only has 120k miles on it so it really shouldn't have any noises but it does. Tho it sounded to me like the flexplate noise, but I dc'd the flexplate and it's the same so it's got noghitn go do with the bolts... guess it still could be cracked? Odd thing about it is when you first start it up, first say 15 seconds it's completely silent... then it builds up, and if you increase the RPM very much at all, the noise goes away. Really seems like lifter noise but it seems a little deeper to me, and again sounds like it's coming from the rear. Any help appreciated.

 

What weight oil and what brand of oil filter? Whats the oil pressure?

 

15/40 I believe, and a wix filter, couple oil changes no change in sound... I don't have a proper oil gauge yet, unfortunately.

 

Check your distributor shaft for excess wobble..

 

Gauge to verify oil pressure is the first place to start.

 

Well, seems it was the FP bolts after all. Got the thing all back together with new bolts and loctite, quiet as a mouse. Did pick up a new autometer OP gauge too... thanks for all the pointers everybody.