Hi Mark & All
Low numbers cold high numbers hot, the R45 is usually the best for every day
driving. For town driving with much stop & go the R46 is the best. Small
blocks use hotter plugs then most others due to the plug being at the bottom
of the combustion chamber.
Lee
----- Original Message -----
From: <mark@noakes.com>
To: <napco4x4@yahoogroups.com>; <oletrucks@autox.team.net>
Sent: Tuesday, July 20, 2004 6:41 PM
Subject: [oletrucks] spark plugs...
> I'd like to ask for comments on spark plug selection.
>
> I'm using a base Goodwrench crate 350 retro'd to look like the original
283 and will be
> using all of the original bolt-ons for that original "look and feel".
That means
> intake, carb, distributer, exhaust manifolds, etc. I know that this
decreases my
> maximum flow somewhat and restricts max rpm and hp, but I have more
concerns about the
> torque that the rest of the stock drivline can take (especially the
original Borg-Warner
> 3-speed OD unit) and am more concerned about fuel economy and low end
torque on this
> truck anyway (after all, I have the modified 86 Corvette convert and
modified 66 Corvair
> coupe when necessary.)
>
> The recommended spark plug for a Quadrajet and headers combo (260hp, 300
lb-ft torque)
> on this engine is R44TS. Some hotter applications suggest R45TS. My 86
Silverado 305,
> a low compression low stress engine, takes R43TS.
>
> High stress hp applications take a colder plug; low stress low compression
applications
> take a hotter plug so I guess that R43TS is the hot plug and R45TS is the
cold end of
> the range, correct?
>
> GM refuses to suggest plugs for a given combination since they say that
any error could
> damage the engine...they don't want the liability...it's up to the end
user to decide.
> It also means that you have to try something and swap around until you get
it right.
> I'd rather get it right the first time.
>
> Any suggestions on what I should try? Anyone have a similar setup?
>
> Any comments on brands/configurations? I was going to try something like
the Bosch
> platinums or multi electrodes but from looking on the internet it appears
that there is
> no advantage to any of these. Just go with plain old AC? I run the Bosch
in the vette,
> but maybe it was my imagination that they were better?
>
> It looks like most (all?) plug options for this engine are resistor type.
While this
> does cut EMI radio interference, it also cuts voltage to the spark plug if
you aren't
> running an HEI distributer...which I'm not. Any comments here?
>
> Thanks for any input.
>
> Mark Noakes
> 58/56 Chevy Suburban, V8, 3-speed + OD
> 58 GMC NAPCO wideside pickup, 6-cyl, 4-speed, orig power steering
> Knoxville, TN
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