Hopefully my 69 was an exception.

CSR recently refused to re-certify a 904 shield "because it was too old". I have heard others say they will only re-certify twice.

We were going to use a Stroud blanket, they say they have no limits on how many times they will re-certify. However they feel for a Drag Week car there should be at least three inches of clearance between the headers and the trans to keep the blanket from getting cooked. I don't think we have that much.