What plugs with hei distributor
April 25th, 2022, 03:53 AM
#2
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Join Date: Sep 2012
Location: saratoga springs,n.y
Posts: 1,907
i was running the r45s in my 72 350 with points and a .040 gap . i changed over to hei and kept the same plug in it .The motor didnt seem to care.When i do a plug change which will be soon i will jump up to a ac delco r46sx .ill keep the gap at .040 .
April 25th, 2022, 05:32 AM
#5
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Join Date: Aug 2011
Posts: 3,199
Keep the same gap or a slightly bigger. A wider gap increases the size of the flame kernel and can contribute to pre-ignition.
I wouldn't switch to the plug intended for a wider gap (SX) but not increase the gap, either stick with the same plug and increase it 0.005" if you'd like OR go the wider gap plug (SX) and use the spec for which that plug is made.
Good luck!!!
I wouldn't switch to the plug intended for a wider gap (SX) but not increase the gap, either stick with the same plug and increase it 0.005" if you'd like OR go the wider gap plug (SX) and use the spec for which that plug is made.
Good luck!!!
April 25th, 2022, 07:58 AM
#6
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Join Date: Jan 2010
Posts: 2,024
The original R46SX comes with an .080" gap. The R46SZ comes with a pre-set .060" gap. The .080" is too wide and will end up killing your HEI components. This is why they replaced the R46SX with the SZ.
Keep it at or under .060 and you should be just fine. .045 isn't bad, either. Just depends on how emissions friendly you like to be.
Keep it at or under .060 and you should be just fine. .045 isn't bad, either. Just depends on how emissions friendly you like to be.
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