oletrucks
[Top] [All Lists]

Re: [oletrucks] spark plugs...

To: <oletrucks@autox.team.net>
Subject: Re: [oletrucks] spark plugs...
From: "Gary DelGrego" <gdelgrego@yahoo.com>
Date: Tue, 20 Jul 2004 21:51:49 -0500
Not sure if my setup is comparable, but I run plain copper AC Delco R45TS in
a stock 350 from '75 (175 hp I think) with stock header and '84 Q-Jet with
HEI.  The engine was put in by the previous owner so I'm not definite on the
exact engine info since it looks to have been rebuilt later in life.

This is in a '48 3100, by the way.

----- Original Message ----- 
From: <mark@noakes.com>
To: <napco4x4@yahoogroups.com>; <oletrucks@autox.team.net>
Sent: Tuesday, July 20, 2004 8:41 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

oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959





<Prev in Thread] Current Thread [Next in Thread>