Checked your timing gear?

rumblefish360 said

I have found that no matter what chain I used from the cheeeeep replacement to the expensive roller master or what ever, the all stretch. While the pricer ones with the better features stretch less, they still stretch.

Bar none on any size engine, be it daily driver or hot street car. Period.

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My findings exactly. Only thing I'll ad is it does it on all small block Mopars. Not just 360's and strokers. The bigger/more aggressive the cam and stouter the valve springs the worse it is. I think the main reason is there is so much chain there since the cam is positioned up high in the block. The more chain the more stretch per link ads up.