I had always known the stock manifold as being very poorly designed... I
know that when I installed the new 4-2-1 manifold on my 1500 it improved
everything hugely...
Plus the fact that it blows gaskets as Bill says... which is a real PITA!
James
----- Original Message -----
From: "William Davies" <bill@rarebits4classics.co.uk>
To: "Nolan Penney" <npenney@mde.state.md.us>; <spitfires@autox.team.net>
Sent: Wednesday, July 23, 2003 2:56 PM
Subject: Re: Stock manifold vs. 4-1 header
> ----- Original Message -----
> From: Nolan Penney <npenney@mde.state.md.us>
> >
> > The US stock exhaust manifold is not a particularly good flowing unit.
> > It's just a big blob of iron that the exhaust gasses get to fight around
> > in before wandering their way down the pipe, particularly the #4
> > cylinder. The UK stock manifold on the other hand, is essentially a
> > well made iron topped tri-Y header, and is very hard to beat.
>
> Hi Nolan,
> Is that the 1300 UK manifold with the single downpipe or the 1500 with
the twin pipes? The latter is extremely troublesome with downpipe gaskets
blowing every 3000 miles or so. I've no idea how efficient it is, just a
warning to anyone who's tempted to seek out a UK spec manifold,
> Cheers,
> Bill.
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