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A few questions on side exhaust with pictures.
1st. Are these pipes for a big block or small block?
2nd. How can you tell original from Paragon reproduction covers?
3ed. Are these numbers on the covers GM or are they on the repro's also?
I don't know for sure, but I thought the BB manifolds exit at an angle,
while the SB manifolds exit straight down.
From the picture, I'd guess SB pipes.
Cover Qs: not sure. I have an original 69 set at home, if you need
some info or pics. PM if you do.