Does anybody know if a exhaust manifold fitted for a 7-bolt flange on the cylinder head will work on a earlier 6-bolt flange if the last bolt is left out? I wouldn't think the manifold would flex enough to cause a leak.
I ask because my 1986 C10 currently uses a 7-bolt style exhaust manifold, and the heads warped and cracked. Now, I found a great deal on the heads I want, but they are the earlier 6-bolt flange. At this point, headers are not an option.
Lead Mechanical Engineer
Art Morrison Ent. Inc.