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<div class="moz-cite-prefix">On 1/11/2017 5:20 AM, Jack Wheeler via
Mgs wrote:<br>
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id="yiv0271995003yui_3_16_0_ym19_1_1484139081376_5891"><span
id="yui_3_16_0_ym19_1_1484140169127_3246">As I plan
for my MGB engine rebuild, I have asked this group for
recommendations, and I have gotten some really helpful
information. Some of it has prompted additional
questions. I hope you do not feel I am taking
advantage of this really helpful service, but I do
have a couple of more questions, some of them
follow-ups on earlier topics.</span></div>
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That's what we're here for. Well, that and discussing cats as wheel
chocks, beer, what kind of oil to use, and maybe even the very
occasional firearms discussion. :-)<br>
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<div><span id="yui_3_16_0_ym19_1_1484140169127_3425">First,
a number of people have talked about using higher
compression pistons. Remember, my car has an 18GK
engine, and the serial number is 243217. It was
produced in 1971 and it appears that a lot of
changes were taking place at that time (US safety
and emission regulations?) Can anyone tell me where
I can find higher compression pistons for this
engine? I'm thinking somewhere in the 10:1 range.</span></div>
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I used Hepolite pistons. I'm pretty sure they're still available.
(update: APT has them. There are probably other sources.)<br>
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<div dir="ltr"><span
id="yui_3_16_0_ym19_1_1484140169127_3425">It has
been suggested that I look into SU 1 3/4"
carburetors, instead of the 1 1/2" carbs currently
on the car. Can anyone tell me where I can find an
intake manifold for this conversion? The
identifying feature is that the 1 1/2" carbs attach
to the manifold with 2 studs, while the 1 3/4" carb
used 4 studs for this attachment.</span></div>
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Bigger carbs will improve your high end power at the expense of low
end driveability. If you're not racing or autocrossing, then it's
probably not worth it. If you do decide to upgrade, look at the
single carburetter conversions. A 4 cylinder engine only has one
cylinder doing intake at any given time, so dual carbs look great,
but they don't necessarily add that much performance. <br>
<br>
That said, do make sure your carbs are in good condition. Worn
throttle shafts will spoil everything and make them nearly
impossible to adjust. <br>
<br>
A less restrictive exhaust system will help your performance more
than new carbs, especially if you have the air injection pump fitted
and go to a performance camshaft. That will be my next performance
upgrade. <br>
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<div dir="ltr" id="yui_3_16_0_ym19_1_1484140169127_4483"><span
id="yui_3_16_0_ym19_1_1484140169127_3425">Has anyone
used Cometic gaskets. I have used them on my
Triumphs, and they are fantastic. Does anyone know
if they have a gasket available for the MGB?</span></div>
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I haven't tried them, so I can't comment. <br>
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<div dir="ltr" id="yui_3_16_0_ym19_1_1484140169127_4485"><span
id="yui_3_16_0_ym19_1_1484140169127_3425">Thanks for
any help you can give me, and I welcome any
additional suggestions.<br>
</span></div>
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<div class="yiv0271995003qtdSeparateBR"
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Jack<br clear="none">
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