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454 Vortec Spark plugs

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Old 08-10-2013, 06:08 PM
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Default 454 Vortec Spark plugs

I have a 454 GM motor in my boat. block casting number 10237297 which comes up as a vortech motor. I assume that the heads would be Vortech heads, which then would take a longer spark plug. I have been running the Delco MR 43 TS, . But seem to be running really cool at idle. Just wanted to make sure i put in the right plugs, so not to damage the pistons. Serial number of the motor 12568777. Thanks. Dan
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Old 08-10-2013, 06:36 PM
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They are a pretty good plug and should be fine for a BBC. I run Autolite APP25 I all my big blocks and they don't do that. If you want one up on that, just go to a XP25
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Old 08-10-2013, 07:18 PM
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Thanks, I was thinking of putting in Delco MR 43LTS. But wanted to make sure not to hit the piston.
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Old 08-11-2013, 11:58 AM
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if thats the base oval port engine it does take the longer plugs
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Old 08-11-2013, 01:21 PM
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Thanks, i do know it has rectangular port heads
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