Need spark plug recommendations

Big Block A body Tech

  1. challenger57

    challenger57 cuda57

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    Sep 21, 2007
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    york, pa.
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    Getting ready to soon fire up my new 400-470 stroker and need plug recommendations. It will be changed to EFI after the initial startup. For now it has a 950 and some motor specs are 11:1 comp, .586 lift comp cam, stealth fully ported heads and will be topped with a Indy Mod Man dual quad intake for the EFI. I am hoping to get away with a fuel mix of 93 octane with some cam 2 mixed. Thanks All
     
  2. ray426

    ray426 Member

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    If you like NGK plugs I would try these NGK R5671A-9 if using dome pistons. R5672A-9 for flattop pistons. These are 5/8 hex 14mm thread. 3/4 inch reach plug. which I believe is correct for stealth heads. (same as E-brocks) The -9 is the heat range. The higher the number the colder the plug for NGK's.
     
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