Headers No. 3 (116)

[Clayton105]

These ones are for a tarmac rally Alfetta GTV. The headers that were on it were cheap replacements of the standard two piece deal. I would guess they were robbing 5 bhp from the engine over the standard Aussie spec headers.

A few problems with standard set-up is that the front secondary (that runs in front of the LH engine mount) gets biffed regularly on lowered cars and ends up flattened. Another is that the primaries are hard to get the right length (16-18") in this configuration (I think standard are about 12-13"). And lastly, the secondaries are unequal lengths.

So this was my solution: Same flange and stub set-up as the 105 headers with correct exit angles, but swept up and around progressively front to rear so that all are ~16". There is a small heat shield over the rubber engine mount as they run pretty close.

There is a flange to join the primaries to the secondaries and the secondaries bend around the rack cross-member. The result is lots of clearance at the front of the engine, and the secondaries are equal length.

There is also a vibration absorber aft of the bell housing extension. These engine vibrate a hell of a lot and few exhaust builders these days hang the exhausts to absorb the resulsant resonances at the rear of the vehicle (therefore fatigue crack-city). It is very hard to hang them with soft hangers (like Mr. Alfa did) when you have a humungous system running in the space designed for something much smaller. Therefore, the rear of the exhaust is quite rigidly located and the vibration is absorbed by the thing-do-hicky.