Spark plugs

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Huckleberry

Huckleberry

Member
Joined
Jul 27, 2023
Posts
32
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28
Location
Valley Bend WV
First Name
Donnie
Truck Year
1978
Truck Model
K15
Engine Size
350ci
Hey everyone, what's the best spark plug for a 350 crate motor. " bone stock" daily driver, please advise on plug gap. Thanks in advance
 
DoubleDingo

DoubleDingo

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Jul 3, 2012
Posts
11,212
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Location
Right where I am
First Name
Bagoomba
Truck Year
1981
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s
Engine Size
Carb'ed Vortec 350
ACDELCO. Gap is .045 with HEI if I recall correctly, and .035 with points. Go to the local auto parts store, rock auto, or whatever, plug in your truck's info and get the ACDELCO plug for that application. Not the fancy iridium or platinum, just the plain-jane copper plugs.
 
Bextreme04

Bextreme04

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Joined
May 13, 2019
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Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
It will be an ACDelco R45TS. That was the specified plug for almost every small block(and some big block) GM engine for decades. My 71 Buick 455 uses the same plugs.
 
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