purchasing 2 sets of this header for my 500hps carb motors guy is not sure who the maker was, will they out perform my stock gill, thanks for any input.

boy looks alot like a CMI

I agree, looks like cmi with out the water tube at the bottom.

Will They Be An Upgrade To My Stock Gills Im Making 550 Plus Hp Now, Also The Water Tube You Mentioned On Bottom Can You Buy That seperate,, He Used Them On His 575 Sc Motors That Already Had Headers On Them. Did This Style Have Any Leaking Issues Like The 525 Cmis.

If you are looking for a horsepower increase, I don't think you will see any at all over the gils. Maybe 5 hp ????

Make sure they are tested first. Looks like they have been on the bottom of the sea!

Looks like they came off a '79 Peterbuilt!

CMI E Tops for sure. If the outside looks that bad, I'd hate to see what they look like inside. I wouldn't put those on my engines without having them go back to CMI to be checked and polished.

Just came of running motors with no issues is what im told, as for polishing i have a guy that will make them look new, but if no horsepower gain not sure it is worth it.

So then why does everyone want headers over gills.