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Crazy Horse

573 Posts

Posted - 18 Sep 2012 :  9:48:10 PM  Show Profile  Visit Vanmor's Homepage  Reply with Quote
I decided to research the clearance issue of headers in general. I called several header manufacturers/sellers. Companies like Hooker, Dougs, Doug Thorley, etc. all said about the same thing. They try to build in as much clearance as possible, but the general consensus is......... IF IT DON'T TOUCH IT'S OK !!! NO MATTER HOW CLOSE IT IS TO ANYTHING ELSE!!!

"A man has got to know his limitations." Dirty Harry

Blued and Painted

3505 Posts

Posted - 18 Sep 2012 :  10:22:04 PM  Show Profile  Reply with Quote
I just ordered a set of Doug's for my 2nd gen bird project. They had the best web sight with the best line of horse manure. I'll make a full report after instalation. Hopefully by spring.

Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Tribal Scout

19 Posts

Posted - 31 Mar 2017 :  08:45:49 AM  Show Profile  Reply with Quote
Just wondering how it went. I have a set of round port dougs that I had ceramic coated. Trying to install in my 77 t/a with E-heads on a '68 428 with motor mount conversion. Between the initial test fit and now, the front end came off for sandblasting and paint and new body bushings. Now the driver side header wont clock enough to seal because the rearmost tube is touching the frame rail. One of the tubes on the passenger side is touching one of the motor mount bolts too. It is like the engine needs to be clocked a degree or 2. Anyone out there with advice on this? Bend the tubes? If so, will the ceramic coating survive or need to be redone?
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Crazy Horse

567 Posts

Posted - 31 Mar 2017 :  09:25:28 AM  Show Profile  Reply with Quote
Guys,a life long friend of mine was Jess Tyree.He was in the header biz in the early 60s untill his death.I watched how the jigs were made.They start with a donner car and hand made a set and everything fit perfect and the jig was made from them.Now if the cars suspension was brand new for the jig they would fit a car perfect.Now put them on a old car where the suspension was worn out now they touch or rub some places.Its a crap shoot especially with a stick shift car.Tom
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Sitting Bull

139 Posts

Posted - 28 Aug 2017 :  3:24:36 PM  Show Profile  Reply with Quote
My mechanic installed my Doug's headers. They fit beautifully. And look great. I've changed heads since and was able to re-attach them without too much pain. And they don't leak so far. (I use the Doug's gaskets.)

but, he had to install shims to adjust the position of the block to make room. Too high and the headers touch the underside of the frame. Too low and the headers touch the top of the frame.

Darrin, use the shims. Piece of cake by comparison to bending the tubes.

note: a word of caution. The Doug's headers are not symmetric. Don't use a stock exhaust gasket if you port your heads. The rear most port needs to be about 1/16" of an inch forward. The heads can't be ported identically. One needs to be the driver side and the other needs to be passenger side.

With that being said, I didn't discover this until after my heads were ported so you CAN do everything with a stock gasket and do it symmetric but it won't be perfect.
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