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I'm installing DCOEs on my TR4A this winter. The car currently has a set of 4-2 (and 1 with the y-pipe) headers, mostly for looks (purchased from Moss). My engine is mildly warmed up (270 degree cam, ~9.5 compression).
I got my new intake manifold for the Webers, but they won't mount with the header as-is. Some of it could be solved by grinding the headers and/or the intake. I'd rather not grind the header because it is ceramic-coated, but some of the areas of the intake are already thin where I would have to grid. But even if I solve that, it looks like the front bend of the header tube will hit the intake.
I did some basic fitting with my stock exhaust manifold, and it looks like that will work without any mods. I'll have to bolt it up to the head just to be sure. So my question is, do headers buy much with a mildly warmed up engine? Or is there another source of headers that might fit better? I have seen a 4-1 header, but I heard somewhere that the 4-2-1 was better (and that is what the stock 4A manifold does).
I got my new intake manifold for the Webers, but they won't mount with the header as-is. Some of it could be solved by grinding the headers and/or the intake. I'd rather not grind the header because it is ceramic-coated, but some of the areas of the intake are already thin where I would have to grid. But even if I solve that, it looks like the front bend of the header tube will hit the intake.
I did some basic fitting with my stock exhaust manifold, and it looks like that will work without any mods. I'll have to bolt it up to the head just to be sure. So my question is, do headers buy much with a mildly warmed up engine? Or is there another source of headers that might fit better? I have seen a 4-1 header, but I heard somewhere that the 4-2-1 was better (and that is what the stock 4A manifold does).