Join Date: Jul 2006
Location: Northfield, Illinois
The places headers confuse fitters are at the change of angle between head and block. If the bottom edge of the flanges interfere with the block, they will leak at the head flanges. This can be due to thick flanges, or over-milled head.
Once installed in the chassis, headers bolted to the head, you may run into interference (or VERY close contact) with components as they pass through the chassis. Then, they may not fit at the collector but usually force here does no harm. Now, is the collector outlet roughly parallel to the floor pans? Again, a hydraulic jack can do wonders here.
Then with luck, running the car a few very-hot to cool cycles and they will stabilize in the force fit position.
The trick with NEW headers is a dummy( EMPTY) block and head only temporarily mounted (with engine mounts) in the chassis. Lots of room to make "adjustments" with final fit left for final assembly.
From my experience.
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