Hello Everyone!
I did a little searching and it appears there's some debate on the heat risers, but I still have a question. I'm putting together my spare slant so I can put it in my D100 while I build the race slant, so this just needs to run "ok" - good enough for dump runs and the occasional local joy ride. With that in mind, I decided to yank off the manifolds while I had the engine on the stand, and realized the original exhaust manifold had a corner cracked off, and I snapped off all 3 bolts that attach the intake/exhaust. I figured a new exhaust manifold would be less hassle and less money than trying to rework the old manifold, so I ordered a new one. The casting quality doesn't look great, but for a stone stock non-rebuilt early 60's slant, I'm not to worried about it. What I AM concerned about is that comparing the old and new manifolds, the new manifold heat riser valve never has a position where it looks like it'll almost completely deflect the exhaust gasses, unlike the old one which does. The engine-side of the flap leaves about 1/4" gap between the top of the valve and the ceiling of the manifold in the "warm" position. Will that create any driveability problems, and if so is there a good way to fix it?
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