I have a 1970 442 with a pioneer flex plate and it looks like it is bowed in the center and my stock one looks flat is this normal or should i buy a different brand flex plate

 

Had the same problem, junk it. Mine was so bowed it left no converter end play. Mine also had the ring gear welded on , off center and crooked to make it run true.

 

what brand did you replace it with

 

I had a pioneer on another motor that was good ,so I used that.

 

pioneer

 

ATI makes a good Oldsmobile V8 piece - I haver one on my 350 -

ATI SFI Approved Flexplate Oldsmobile V8

Part Number: 085-915565

 

I’ve never needed to buy an aftermarket flexplate for my cars. I’ve always been able to source factory pieces if there was damage (which is not common). I think I’ve got three known good spares and I really don’t consider myself a hoarder. Am I just in a minority and buying aftermarket flexplates is common place now? Even so, the quality control of the aftermarket pieces must be non existent based on reports.

 

I dunno what reports you're basing your thoughts on but at least in regards to the ATI, it's a good quality aftermarket piece. Been behind my motor for 5+ years and was a perfect fit/function install right from the box. AND it's a bit cheaper now at $227 than I paid then ($250-ish).

 

No man, you’re misunderstanding. My response was intended for the OP’s part.

 

I've had good luck with aftermarket flex plates. Flexplates sometimes can be a bit not flat, it usually is not an issue unless there is interference.