Acid Porting

[Tom Meyer]

I know the concept but what is the best way to acid port some exhaust manifolds. What type of acid works the best, heat no heat, how often do change or do a clean out? How about any good stories from the past. Always heard stories about lite weight cars being dipped back in the day. Tom

[Mike Taylor 3601]

The chirping of crickets is all I hear. LOL

What kind of manifolds are you working on? I used to have to port some by grinding when local dirt tracks had classes that didn't allow headers,was tough grinding they get hardened from the heat.

I don't know what they used but I use to take apart steering boxes,master cylinders etc. and reassemble them for a chrome shop,before they start the plating process they dip in a acid solution,if they didn't mask good it would eat the sealing areas completely out of the casting, it appeared to be some bad stuff, so maybe check with a chrome plater

Mike Taylor 3601

[JHeath]

Maybe these guys can give you some advice.www.castheads.com

[Dan Fahey]

Originally Posted by Tom Meyer

I know the concept but what is the best way to acid port some exhaust manifolds. What type of acid works the best, heat no heat, how often do change or do a clean out? How about any good stories from the past. Always heard stories about lite weight cars being dipped back in the day. Tom

Extrude Hone.
Check out www.PureStockDrags.com
They have their Stock Exhaust, fuel lines extrude honed for performance.

They have another division that everything must look stock from the outside.

This should impress you.
http://blog.hemmings.com/index.php/2...gs-2011-recap/

[Rob Petrie E395]

Do a search on here. I posted the name of a place a couple years ago that can do whole car bodies. Cant remember the name now. But they are still in business or were a couple of years ago. They did a NASCAR race car that was busted at Martinsville a few years ago. I knew someone that worked there at the time and actually was the one who dipped that particular cars body panels. He has since passed away or I would get their info from him for you. When I was involved with Late Model stock cars (asphalt) years ago we would send all the steel body panels out before hanging them to be acid dipped. I think it was a waste but I was not paying for it. As for exhaust manifolds and stuff like that we were required by the rules at that time to use a factory cast exhaust manifold. We used the Corvette Rams Horn manifolds and sent them to a place called Brezenski (might not be spelled right) to have the acid work done. By the time we got them back they were so thin that you had to be very careful not to drop them or they would break. Especially after they had been run a couple of races. They don't last very long when you do this. But the car owner had deep pockets it helped so we did it. I saw some neat stuff back then.

[Pvt Parts]

Originally Posted by Tom Meyer

I know the concept but what is the best way to acid port some exhaust manifolds. What type of acid works the best, heat no heat, how often do change or do a clean out? How about any good stories from the past. Always heard stories about lite weight cars being dipped back in the day. Tom

Nitric