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Old 04-01-2013, 11:57 AM
eric32 eric32 is offline
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Need help with sbc aluminum head spark plug selection

Hello guys I am putting a set of dart shp aluminum heads in place of rhs iron heads on my 350 sbc and I am wanting to run a hot plug for street use as I will not be turning high rpms very often and engine is only around 9 to 1 compression ratio. It takes 3/4 reach gasket style plug and I don't know where to start. I found ngk 5155 heat range 4 and want to run a plug like this but I am wanting a cross reference with other brands such as champion, bosch, acdelco, autolite, and denso plugs in the same heat range if anyone can help. Looking up on certain sites it gives different number's but there different heat ranges. My engine will need to keep the plugs clean as I will be in traffic at times and don't want them fouled. I had a set of .708 reach tapered seat ngk heat range 5 plugs and they where too cold and fouled out after a while. Can anyone help me out with a chart to right down the different brands. Thanks for any help.
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