Dougs D103 headers

Yes.  On log manifold cars, the bump is probably a half a second in quarter mile ET.  Your free flows are a little better so you won't get quite the bump, but you will feel it.  Since you asked, I assume you haven't run headers before, so I would point out that they will be noisier.  Also, a very restrictive exhaust with stock style mufflers won't get quite the maximum benefit out of the headers.  Have fun!

I got them in my 72 Javelin/AMX now . The driver side went in really easy . The passenger side took some work modifying the engine mount bracket . I cut a chunk out of it and welded it back together . I also had to rotate the motor mount 180 degrees . It bolted right in after that . Even through they're in now , I wouldn't recommend them . Next time I'll just bite the bullet and buy the American Racing Headers for double the price .

Red Devil wrote: ... but any reason why a "small body" header won't fit a "big body" car?   I've had Hedman's on both.   My understanding is the ARH "big body" headers don't clear a wider-than-stock sump oil pan, but the "small body" headers actually have more pan clearance.     Not sure if anyone with a "big body" car e.g. Javelin or AMX is running the ARH "small body" headers ... specifically, if they also have an Aviaid or Armando pan and does it clear?   'Guess a better subject for another thread.   Thanks,RD

tufcj wrote: What ARH is going by is the width of the engine compartment.  The engine compartment is much narrower on the "small body" cars listed above.  If you try to use AMX headers in a Hornet, they're much too wide to fit.  The "small body" headers tuck much closer to the engine. Bob tufcj

This. The small body cars are at least an inch narrower between the frame rails.

If things like port matching are important to your build , ARH match up perfectly to your heads , no work needed there. Same with fit and finish , The header bolts go in with no problems, you can get a spark plug socket past the flange because its CNC to give you room. The flanges are thick enough not to warp and leak. They fit your car . If you want to lift your engine and trans out together you could put one strap on one tube on each side of these headers and lift them out together (don't try but they are that strong ). I have a pair and they are great.