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An easy way to make another minor improvement, if space permits, is to move the manifolds out away from the port by 1/2” or more (add a 2nd gasket and longer studs or bolts). This moves the restrictive angle that the gas must follow farther away from the port, and increase total port & manifold...

Even though there are the best stock parts, they are still inferior to a tube header in terms of power. However, all iron manifolds can be substantially improved by porting. This means enlarging the entry openings (where the manifold bolts to the exhaust ports in the head) to or slightly beyond...

Although (for example) the early 340 manifolds fit all LA type heads, they do not fit all chassis, such as the narrow 1960-66 A bodies. The “383 Magnum”, 440 GTX, TNT, R/T etc. B/RB manifolds don’t fit any A body directly, and may have clearance problems on some other chassis Tim Hage of...

All Mopar engines were installed with cast-iron exhaust manifolds. The castings varied over the years, but the castings from the late 1960’s to early 1970’s generally offer the lowest restriction and best flow of the possible choices (the obvious exception being the Max Wedge/Ramcharger 413/426...

Cast-iron exhaust manifolds produce less power than a properly designed set of tube headers. In addition (and assuming no variables), there are 2 very different factors involved in comparing manifolds to headers. The most obvious is pumping loss (“back pressure”), you’re just not going to...

Thanks. I appreciate the information. I'll put up a wanted post and see if anything turns up. Eric

So what y'all are saying, they basically just look cool. That isn't really a bad reason. I'm not looking for tons of power or really any gains at all. Its a heavy car... And headers on a car like mine doesn't really make sense to me, unless I make a bunch of mods on the engine. Might...

Hello, I'm going to be getting new exhaust on my 65 soon and I was wondering if it would be worth it to switch over to a set of HP Exhaust Manifolds? Or would it be better to keep with the Log manifolds that are currently on the car? I am not to fond of headers with the inherent problems...