Spark plug recommendation and jetting

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Spark plug recommendation and jetting

Post  cobrakid8 on May 22nd 2018, 12:31 pm

We should hopefully get the motor started in the near future once we have the pushrods correctly measured. So my question is what would be a good plug to go with and also jetting on this motor?

521 A-Headed motor, CR should be around 14/1 has a Holley 1050 Dominator and probably will be on C12 race gas. Right now it has 94 jets squared on it, cannot remember what autolite plugs it has in it, but since the guy seemed to have just thrown stuff together to trade it as a "race-ready" motor I would just buy new and go from there. Any help is appreciated. Thanks!

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Re: Spark plug recommendation and jetting

Post  away on May 22nd 2018, 3:06 pm

NGK R5671A-8 4554
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Re: Spark plug recommendation and jetting

Post  cobrakid8 on May 22nd 2018, 7:23 pm

Thank you!

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Re: Spark plug recommendation and jetting

Post  Fast Bear on June 8th 2018, 11:03 pm

I have a 521scj alloy heads cr 10.5 .. 950 holley and to go on pump gas . What plugs would a good start..

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Re: Spark plug recommendation and jetting

Post  rbro460 on June 9th 2018, 4:23 pm

Autolite Racing AR3393

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Re: Spark plug recommendation and jetting

Post  Fast Bear on June 9th 2018, 4:45 pm

No nos.... Cheers

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