On a 350, can anyone tell me what the distance around the stock header is and the distance around the stock exhaust tip? I'm trying to figure out if this is a stock exhaust or not....it seems bigger. Any pics of a stock 1985 iroc z28 exhaust will reallyyyy help.

Thanks,
Ed

 

you should know depending on the model and mileage....it will be very small and rusty.



however according to my manual the stock tai pipe o.d. and wall thickness was 63.5 x 1.07 mm or 2.75 x o.o5 in. however this is 1991 gm specs. there is no data on the stock MANIFOLD however, you should not have headers if it's stock.