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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