Gary -
The Triumph 1-3/4 H6s have one of the float chambers
located on the wrong side, so you can't use the float
chamber connection pipe between the two for a 100. I
think the choke levers use a different setup too.
100M H6s will have the float chambers in the same
orientation as the Stock H4s (i.e. both facing car
forward).
Moss made the same mistake and was selling Triumph H6s
as 100M upgrades a couple of years ago... until they
got enough complaints and figured it out.
The difference between the stock manifold and the 100M
manifold is the throat size is different... obviously.
If you get manifolds be sure to get the carb
insulators too. They have to be the right thickness
otherwise the float chamber connectors won't line up
correctly.
Main advantage of installing higher compression
pistons is more horsepower, drawback is you have to
use higher octane fuel/$$$.
The 100M cam and 100M distributor are balanced to work
with each other, so you will notice more horsepower...
particularly at mid to higher RPMs, but if you want to
save money just have your stock dist. rebuilt to 100M
spec. Alot of Healey specialist shops will rebuild it
accordingly.
Cheers,
Alan
'53 BN1 '64 BJ8
--- GSFuqua1@aol.com wrote:
> A few of questions for the collective. I have a 56
> BN2 that I want to make
> some of the M modifications to. Such as the Carbs,
> Airbox, etc. The engine
> was rebuilt recently (about 1000 miles ago) while in
> possessions of the previous
> owner. The question came up about what is the
> difference between the 1 3/4
> SU Carbs that were used on Triumphs and those used
> on the 100 M's. I have NO
> idea!! In fact the previous owner said he had
> installed rebuilt H 6 SU carbs.
> Are those the 100 M version? How does one tell?
> Also what is the difference
> between the stock intake manifold and the one for
> the 100 M? Again, no clue
> from me. Any help welcome. Lastly I seem to
> remember a recent thread about
> the benefits or lack thereof of installing the 100 M
> cam without the 100 M
> pistons. Can anyone give me a short recap? The
> previous owner also installed a
> "New" distributor (standard points and condenser).
> Do I need to change that to
> the distributor for the 100 M? What are the
> advantages, disadvantages? The
> car runs good with no overheating or complaint. I
> would just like a little
> more kick and I like the looks of the 100 M mods.
>
> My humble thanks!! Gary
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