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Old 05-06-2007, 11:16 AM   #1
53lowdown
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sparkplugs - R45TS vs R43TS

I have a 69 307 with edelbrock, mild cam, accel HEI and headers. PO was running ACDELCO R45TS sparkplugs. I have some new ACDELCO rapidfire platinums laying around (ACDELCO 1) that are supposed to be replacements/equivelent to R43TS.

I can't seem to find a good cross reference or chart for ACDELCO plugs.

Is it ok to run ACDELCO 1 (RAPIDFIRE PLATINUMS) in this engine. What's the difference between R45TS and R43TS
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Old 05-06-2007, 11:18 AM   #2
jsbgump
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Re: sparkplugs - R45TS vs R43TS

The r45's are a hotter plug han the r43
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Old 05-06-2007, 08:21 PM   #3
JimKshortstep4x4
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Re: sparkplugs - R45TS vs R43TS

Here is a link to the AC spark plug identification codes.

http://www.acdelco.com/parts/sparkpl...tification.jsp

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