Sanderson makes a hell of a nice header. VERY thick flanges. However, I can guarantee if you follow my directions with any decent header it will not leak.....
- buy decent headers with a thick flange and thick wall tubes
- cut a slice out of the flange between the exhaust ports, this allows the heads to warp all they want and they will not leak.
- use header gaskets not stock gaskets
- whether you use locking bolts or not you have to tighten the bolts once a week for a few weeks after you install them. Then once a month after that
As for the collector gaskets I havent had any problems with just normal mrgaskets,even after bouncing off a few speedbumps. Try the dead soft aluminum ones if you do.
Good Luck.
CoryM
__________________
1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
http://www.geocities.com/chevroletc1070
"Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high."
Lieutenant Colonel John McCrae, Canadian Army