Chris, for what it's worth, I did this to my MGB when I did the last head
gasket change. I matched the carb size and then the head port size to the
manifold and then smoothed everything out, especially the balance tube
between the carbs. The difference it made was incredible! I took the most
out of the balance pipe, and I believe that is where the biggest gain came
from.
The car had more acceleration and low end torque. I was careful to not
polish the inside of the manifold, as I believe this would have a negative
effect. This is not a race motor, just one I mildly tweaked.
Again, for whatever it's worth, this is an MG.
Charly
----- Original Message -----
From: "Chris Kantarjiev" <cak@dimebank.com>
To: <fot@autox.team.net>
Sent: Friday, November 28, 2003 5:41 PM
Subject: HS6 on GT6+
> I've had a set of the TriumphTune adapter plates, a pair of HS6
> and a spare intake manifold sitting around for years. For some
> reason, the rainy weather today inspired me to spend a few hours
> in the shop trying to find it all and start setting it up.
>
> I was quite surprised when I got the heater valve out intact. I
> haven't yet budged the steel hose barb or the pot metal banjo
> bolt; I'm sure one of those will tear right out :-)
>
> Anyway, I have been trying to decide if it's worth boring out
> the manifold to match the 1.75" hole. There isn't really enough
> meat to cut clear through all around; there's a section at
> the bottom that is already blended up into the splitter, and
> some of the manifold around there won't take much cutting
> at all. But parts of it will.
>
> Is it worth it? I can't do it with "just" a boring head, though
> I could do some - but it might be an excuse to by a small
> rotary table for the milling machine. :-)
>
> Or I could just bore down to the thickness of the mounting face
> and leave a step, or blend the step.
>
> Thanks,
> chris
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