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MR43LTS spark plugs

Old 03-25-2012, 12:48 PM
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Default MR43LTS spark plugs

I've got vortec SBC and I was told that the delco MR43LTS is the best plug for these heads. I am also curious about the R44LTS. I do know the M in the part number is for marine application. Any thoughts?
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Old 03-25-2012, 06:10 PM
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Im also using a TBIV ignition. What gap should I use on the plugs with vortec heads?
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Old 03-25-2012, 07:38 PM
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The 44 is a 'warmer' plug than the 43's. With ACDelco, the heat range #'s go up as the plug get's a 'hotter' designation and vice versa.

Typically 'coldest' is 41 and 'warmest' 45 or 46.

The 43's should be perfect.

.035"-.040" gap will also be perfect.
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Old 03-25-2012, 08:09 PM
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also keep in mind that thoce heads dont like alot of timing,,32* max
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Old 03-26-2012, 02:02 PM
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i have the same heads and msd and box ignition and run ngk tr6 and my total timing is 32 to 34 i think
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Old 03-27-2012, 07:27 AM
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Originally Posted by innerrage
i have the same heads and msd and box ignition and run ngk tr6 and my total timing is 32 to 34 i think
you are not supposed to "i think" your total advance. be sure. i think a couple of degrees too advanced and bad things happen to piston tops. a couple of degrees too retarded and you are wasting fuel being passed by sundancers.
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Old 03-27-2012, 08:09 AM
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also vortec heads use a long reach plug, not the same as a std small block...
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Old 03-27-2012, 07:11 PM
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MR43LTS is a long reach plug
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