Mirada512
Active Member
Hey guys, currently working on my Mirada and I am wondering have any of you guys who have big blocks what type and brand of header are you using?
Yeah it bites about the Schumacher headers not being available but judging by how your engine is dressed with them shouldn't shorty headers works just fine then judging by the collector location?Kind of a moot point, since Schumacher is gone but, the "Tri-Y" headers fit like a glove and for the street are more than adequate. They're shorty 4-2-1 type headers and maybe other brands are available(?) The right side slid in from the top, left side from underneath with the steering shaft slid back. It would also go in from above if the master cyl. was removed.
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That's the ONLY reason I made headers. The fit on both sides. When you do swaps involving things that weren't meant to be, headers become part of life, but I am not a fan. Go with stainless, make the most of it. Also, even though numerous people do this swap, they don't always fit exactly the same. I have done the swap half a dozen times, and even if I use the same mounts, the clearances can vary by up to an inch and a half in a couple of places. The engine tilts in a couple of different ways. When they made a master pattern to sell headers, they fit the very car they had available at the time. They may not fit yours. I would rather buy quality materials and make headers to fit the specific vehicle I have on hand.Problem is, the only manifolds that will fit an F/M/J body with an RB are the restricted standard passenger car ones (far as I'm aware). The "hi-po" manifold outlets are in the wrong spot. The left side would exit inside the car onto the drivers foot, the right exits directly over the subframe rail. My original 440 came from a rotted to the door handles '71 RR, back in 1989. and it was obvious right away, the manifolds on the engine would never work in an Aspen.
1974ish Newport I think. I got it at AutoZone four years ago. Even the smaller booster barely fits. Been thinking about either going manual brakes or hydro boost.Which booster are you using, Duke5A?