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Discussion Starter · #1 ·

i was wondering which way should the open gap of the spark plugs point on a 258 engine (up or down). i heard that if you point the open gap towards the open area in the cylinder chamber, you can increase combustion efficiency.



Jack Pien
83 258 CJ7 HEI/CenterforceI

Discussion Starter · #2 ·
I haven't heard of anyone bothering with this in something that is so relatively low powered. Sorry, can't provide any real useful info on this though.

95.5 YJ with "stuff"

Discussion Starter · #3 ·
The open side goes towards where the fuel is coming from, the intake side of the chamber. Most hp auto companies sell the washers,
I think I've seen them in Summit's catalog. Like FNG said, on a stock 258 you probably won't see a benefit, years ago we used to
do this to get the extra 1/2 hp or so out of racing motors, but personally I haven't bothered since.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
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