In normal street use there will be no noticable gain in horsepower
by using a tubular header on an MGB.
The MGA is another story.
Accurate fit and port lineup are the worst problems with headers.
Noise and blown gaskets are the main downsides from normal use.
> -----Original Message-----
> From: Phil Bates [mailto:firstname.lastname@example.org]
> Sent: Monday, December 27, 1999 10:15 PM
> To: email@example.com
> Subject: Header??
> OK, while I have the engine and trans out to work on the
> transmission, I
> am considering putting a header on my '67 MGB. Here is the thought
> process - I have a 3-main 1800 motor in my MGA with a header, and it
> seems to have a lot more power. The gearing should be the
> same for both
> (I did change the A's rear axle to an early MGB axle). Anyone know of
> disadvantages of using a header on this car (other than cost) - I have
> heard the stock manifold is pretty good, but I think a header would be
> better. I do expect that I'll always have a little less
> power in the B
> because of the 2 extra bearings, but it shouldn't be much different.
> Phil Bates